Quarterlytics / Energy / Oil & Gas Exploration & Production / Patterson-UTI Energy

Patterson-UTI Energy

pten · NASDAQ Energy
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Industry Oil & Gas Exploration & Production
Employees 5001-10,000
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FY2009 Annual Report · Patterson-UTI Energy
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Patterson-UTI Energy, Inc.
450 Gears Road, Suite 500
Houston, Texas  77067
Telephone: (281) 765-7100
Fax: (281) 765-7175

www.patenergy.com

P A T T E R S O N - U T I   E N E R G Y ,   I N C .           2 0 0 9   A N N U A L   R E P O R T

P A T T E R S O N - U T I   E N E R G Y ,   I N C .   2 0 0 9   A N N U A L   R E P O R T

C O R P O R A T E   I N F O R M A T I O N

 CORPORATE OFFICE

TRANSFER AGENT

DIRECTORS

CORPORATE OFFICERS

Patterson-UTI Energy, Inc.
450 Gears Road, Suite 500
Houston, Texas  77067
Telephone: (281) 765-7100
Fax: (281) 765-7175
www.patenergy.com

Continental Stock 
Transfer & Trust Company
17 Battery Place, 8th Floor
New York, NY 10004
Telephone: (212) 509-4000
www.continentalstock.com 

COMMON STOCK

INDEPENDENT AUDITOR

Nasdaq: PTEN

PricewaterhouseCoopers LLP

Mark S. Siegel 
Chairman 

Douglas J. Wall 
President and
Chief Executive Offi cer 

Kenneth N. Berns 
Senior Vice President 

John E. Vollmer III 
Senior Vice President –
Corporate Development,
Chief Financial Offi cer
and Treasurer 

Seth D. Wexler 
General Counsel
and Secretary

Gregory W. Pipkin
Chief Accounting Offi cer
and Assistant Secretary

Mark S. Siegel 
Chairman, Patterson-UTI Energy, Inc.;
President, Remy Investors and 
Consultants, Incorporated 

Kenneth N. Berns 
Senior Vice President,
Patterson-UTI Energy, Inc.

Charles O. Buckner 
Retired Partner,
Ernst & Young LLP

Curtis W. Huff 
Managing Partner
Intervale Capital LLC 

Terry H. Hunt 
Energy Consultant
and Investor 

Kenneth R. Peak 
President and 
Chief Executive Offi cer, 
Contango Oil & Gas 

Cloyce A. Talbott 
Former President and
Chief Executive Offi cer, 
Patterson-UTI Energy, Inc.

COMPANY PROFILE         Patterson-UTI Energy, Inc. subsidiaries provide 
onshore contract drilling and pressure pumping services to exploration 
and production companies in North America. Patterson-UTI Drilling 
Company LLC has approximately 350 marketable land-based drilling rigs 
that operate primarily in the oil and natural gas producing regions of Texas, 
New Mexico, Oklahoma, Arkansas, Louisiana, Mississippi, Colorado, Utah, 
Wyoming, Montana, North Dakota, Pennsylvania, West Virginia and 
western Canada. Universal Well Services, Inc. provides pressure pumping 
services primarily in the Appalachian Basin.

P A T T E R S O N - U T I   E N E R G Y ,   I N C .   2 0 0 9   A N N U A L   R E P O R T

Financial Highlights 
(dollars in thousands, except per share amounts – unaudited) 

Revenues 
Operating income (loss) 
Net income (loss) 
Net income (loss) per share – 
  Basic 
  Diluted 
Cash dividends per share 
Total assets 
Borrowings under revolving credit facility 
Stockholders’ equity 
Working capital 

Operational Highlights 
(dollars in thousands – unaudited)

Contract Drilling:
Operating days 
Average revenue per day 
Average direct operating costs per day 
Average margin per day (1) 
Average rigs operating during the year 
Number of rigs operated during the year 
Number of wells drilled during the year 

Pressure Pumping:
Number of jobs 
Average revenue per job 
Average direct operating costs per job 
Average margin per job (1) 
Hydraulic horsepower at end of year –
  Fluid 
  Nitrogen 
  Total 

2005 

2006 

Year Ended December 31,
2007 

2008 

2009

$ 1,618,444 
  569,684 
  372,740 

2.18 
2.15 
0.16 
  1,795,781 
— 
  1,367,011 
  382,448 

$ 2,354,228 
  1,010,319 
  673,254 

4.05 
4.00 
0.28 
  2,192,503 
  120,000 
  1,562,466 
  335,052 

$1,986,096 
  663,310 
  438,639 

2.81 
2.78 
0.44 
  2,465,199 
50,000 
  1,896,030 
  227,577 

$ 2,063,880 
  545,933 
  347,069 

2.25 
2.23 
0.60 
  2,712,817 
— 
  2,126,942 
  338,761 

$  781,946
(48,214)
(38,290)

(0.25)
(0.25)
0.20
  2,662,152
—
  2,081,700
  263,960

  100,591 
14.77 
$ 
7.72 
$ 
7.05 
$ 
276 
307 
4,594 

$ 
$ 
$ 

9,615 
9.69 
5.72 
3.97 

42,000 
19,200 
61,200 

  108,192 
20.05 
$ 
9.26 
$ 
10.79 
$ 
296 
331 
5,050 

$ 
$ 
$ 

11,650 
12.50 
6.67 
5.83 

43,200 
22,200 
65,400 

$ 
$ 
$ 

$ 
$ 
$ 

89,095 
19.55 
10.81 
8.74 
244 
338 
4,237 

14,094 
14.39 
7.47 
6.92 

67,200 
28,200 
95,400 

$ 
$ 
$ 

93,068 
19.38 
11.16 
8.22 
254 
315 
4,218 

12,900 
16.86 
10.28 
6.58 

$ 
$ 
$ 

90,450 
32,400 
  122,850 

33,394
17.95
10.71
7.24
91
243
1,539

7,265
22.22
15.34
6.88

$ 
$ 
$ 

$ 
$ 
$ 

  127,800
35,400
  163,200

(1)   Average margin represents average revenue minus average direct operating costs and excludes provisions for bad debts, other charges, depreciation, amortization and 

impairment and selling, general and administrative expenses.

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
C O N T R A C T   D R I L L I N G                 

We have made signifi cant upgrades over the last several years to our drilling fl eet to match the needs 

of our customers. While conventional wells remain an important source of natural gas and oil, our customers 

have expanded the development of shale and other unconventional wells to help supply the long-term increasing 

demand for natural gas and oil in North America. 

  To address our customers’ needs for drilling wells in the newer horizontal shale and other unconventional 

“resource plays”, we have expanded our areas of operations and improved the capability of our drilling fl eet. 

We have continued to deliver new APEX™ rigs to the market and make 

performance and safety improvements to existing high capacity rigs. In 2009, 
we added 20 new APEX™ rigs to our fl eet consisting of fi ve APEX™ 1500, 
six APEX™ 1000 and nine APEX™ Walking rigs. And, we will deliver more 

of these rigs in 2010.
     APEX™ 1500s are 1,500HP electric rigs with advanced EDS systems, 

500 ton top drives, iron roughnecks, hydraulic catwalks, and other highly 
automated pipe handling equipment. APEX™ 1000s are 1,000HP electric rigs 
with advanced technology equipment similar to the APEX™ 1500s, but with a 

more compact design to fi t on smaller locations, such as for drilling Marcellus 
Shale wells in Appalachia. APEX™ Walking rigs are designed to effi ciently 

drill multiple wells from a single pad, by “walking” between the wellbores 

without requiring time to lower the mast and remove the drill pipe.

  Additionally, to meet the needs of the increased demand for drilling horizontal wells, we have continued to 
acquire top drives and improve the capability of many of our non-APEX™ rigs to effi ciently drill these wells. 

We are an active participant in the signifi cant unconventional “resource plays” in the United States. 

  We remain a market leader in the drilling of conventional wells of varying depths. Over the last several years we 

have made substantial improvements to our overall drilling fl eet to improve the drilling effi ciency of these wells. 

Improvements have included higher capacity pumps, high-effi ciency mud systems and iron roughnecks.

  As of the end of 2009, we had 341 marketable land drilling rigs of which approximately 80% have depth 

capacities ranging from 12,000 to 30,000 feet.

P A T T E R S O N - U T I   E N E R G Y ,   I N C .   2 0 0 9   A N N U A L   R E P O R T

P R E S S U R E   P U M P I N G                 

Our pressure pumping business, Universal Well Services, Inc., continues to build on its 30 year 

tradition of offering a full line of pressure pumping services to our customers throughout the 

Appalachian Basin. In 2010, Universal is well positioned, both in locality and capability, to capitalize on the 

shale gas market in Appalachia. Locations in Pennsylvania, West Virginia, Kentucky and Tennessee provide 

services in the basin’s major shale gas plays. The basin is home to the Marcellus Shale, as well as the Huron and 

Chattanooga Shales. 

  From the stimulation of the Marcellus discovery well in October of 2004, the Renz#1, to the present day, 

Universal continues to add purpose built equipment that incorporates the experience and knowledge we have 

gained from operating successfully for the past thirty years. Our team of engineers, geologists, technicians, 

and operating personnel work to design and perform jobs 

effi ciently, effectively, and economically, which has earned us 

the respect of our customer base. Our hydraulic fracturing, 

nitrogen fracturing, acidizing and cementing capabilities, 

as well as fl owback and slickline services enable us to serve 

many of our customers needs. Our fl eet of quintiplex frac 

pumpers, 140 BPM blenders, and satellite equipped frac 

vans allow us to effi ciently perform complex shale frac jobs.

    We continue to add capacity in a controlled fashion that 

allows us to train crews and develop personnel. Training 

remains an essential part of our strategy to meet safety and quality standards. Our in-house Advanced Leadership 

Training is helping accelerate the development of management skills of our operators, foremen, and managers.

  The long term advantages of natural gas usage and the proximity of the Marcellus to a large population of 

natural gas consumers, makes this an ideal region to grow our already substantial position. In the Huron and 

Chattanooga Shales, Universal’s complement of high rate nitrogen pumping equipment gives us the ability to 

perform the larger stimulation projects, which is the key to unlocking the natural gas from these plays. 

P A T T E R S O N - U T I   E N E R G Y ,   I N C .   2 0 0 9   A N N U A L   R E P O R T

Financial Review

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

Form 10-K

(Mark One)
¥

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2009

or

n

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from

to
Commission File Number 0-22664

Patterson-UTI Energy, Inc.

(Exact name of registrant as specified in its charter)

Delaware
(State or other jurisdiction of
incorporation or organization)

450 Gears Road, Suite 500, Houston, Texas
(Address of principal executive offices)

75-2504748
(I.R.S. Employer
Identification No.)

77067
(Zip Code)

Registrant’s telephone number, including area code:
(281) 765-7100
Securities Registered Pursuant to Section 12(b) of the Act:

Title of Each Class

Common Stock, $0.01 Par Value
Preferred Share Purchase Rights

Name of Exchange on Which Registered

The Nasdaq Global Select Market
The Nasdaq Global Select Market

Securities Registered Pursuant to Section 12(g) of the Act:
None

or No n
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ¥
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes n
or No ¥
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange
Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been
subject to such filing requirements for the past 90 days. Yes ¥

No n

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive
Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter
period that the registrant was required to submit and post such files). Yes ¥

or No n

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be
contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this
Form 10-K or any amendment to this Form 10-K. ¥

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting
company. See definition of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer ¥

Accelerated filer n

Non-accelerated filer n

Smaller reporting company n

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes n
The aggregate market value of the voting and non-voting common equity held by non-affiliates of the registrant as of June 30, 2009, the
last business day of the registrant’s most recently completed second fiscal quarter, was $1,944,259,033, calculated by reference to the closing
price of $12.86 for the common stock on the Nasdaq Global Select Market on that date.

No ¥

As of February 17, 2010, the registrant had outstanding 153,567,174 shares of common stock, $.01 par value, its only class of common stock.
Documents incorporated by reference:
Portions of the registrant’s definitive proxy statement for the 2010 Annual Meeting of Stockholders are incorporated by reference into

Part III of this report.

DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K (this “Report”) and other public filings and press releases by us contain
“forward-looking statements” within the meaning of the Securities Act of 1933, as amended (the “Securities Act”),
the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and the Private Securities Litigation
Reform Act of 1995, as amended. These “forward-looking statements” involve risk and uncertainty. These forward-
looking statements include, without limitation, statements relating to: liquidity; financing of operations; continued
volatility of oil and natural gas prices; source and sufficiency of funds required for immediate capital needs and
additional rig acquisitions (if further opportunities arise); impact of inflation; demand for our services; and other
matters. Our forward-looking statements can be identified by the fact that they do not relate strictly to historic or
current facts and often use words such as “believes,” “budgeted,” “continue,” “expects,” “estimates,” “project,”
“will,” “could,” “may,” “plans,” “intends,” “strategy,” or “anticipates,” or the negative thereof or other words and
expressions of similar meaning. The forward-looking statements are based on certain assumptions and analyses we
make in light of our experience and our perception of historical trends, current conditions, expected future
developments and other factors we believe are appropriate in the circumstances. Although we believe that the
expectations reflected in such forward-looking statements are reasonable, we can give no assurance that such
expectations will prove to have been correct. Forward-looking statements may be made orally or in writing,
including, but not limited to, Management’s Discussion and Analysis of Financial Condition and Results of
Operations included in this Report and other sections of our filings with the United States Securities and Exchange
Commission (the “SEC”) under the Exchange Act and the Securities Act.

Forward-looking statements are not guarantees of future performance and a variety of factors could cause
actual results to differ materially from the anticipated or expected results expressed in or suggested by these
forward-looking statements. Factors that might cause or contribute to such differences include, but are not limited
to, deterioration of global economic conditions, declines in oil and natural gas prices that could adversely affect
demand for our services and their associated effect on day rates, rig utilization and planned capital expenditures,
excess availability of land drilling rigs, including as a result of the reactivation or construction of new land drilling
rigs, adverse industry conditions, adverse credit and equity market conditions, difficulty in integrating acquisitions,
demand for oil and natural gas, shortages of rig equipment, governmental regulation and ability to retain
management and field personnel. Refer to “Risk Factors” contained in Part 1 of this Report for a more complete
discussion of these and other factors that might affect our performance and financial results. You are cautioned not
to place undue reliance on any of our forward-looking statements. These forward-looking statements are intended to
relay our expectations about the future, and speak only as of the date they are made. We undertake no obligation to
publicly update or revise any forward-looking statement, whether as a result of new information, changes in internal
estimates or otherwise.

PART I

Item 1. Business

Available Information

This Report, along with our Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and amendments
to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act, are available free of
charge through our Internet website (www.patenergy.com) as soon as reasonably practicable after we electronically
file such material with, or furnish it to, the SEC. The information contained on our website is not part of this Report
or other filings that we make with the SEC. You may read and copy any materials we file with the SEC at the SEC’s
Public Reference Room at 100 F Street, NE, Washington, DC 20549. You may obtain information on the operation
of the Public Reference Room by calling the SEC at 1-800-SEC-0330. The SEC maintains an internet site
(www.sec.gov) that contains reports, proxy and information statements and other information regarding issuers that
file electronically with the SEC.

1

Overview

We own and operate one of the largest fleets of land-based drilling rigs in the United States. The Company was
formed in 1978 and reincorporated in 1993 as a Delaware corporation. Our contract drilling business operates
primarily in Texas, New Mexico, Oklahoma, Arkansas, Louisiana, Mississippi, Colorado, Utah, Wyoming,
Montana, North Dakota, Pennsylvania, West Virginia and western Canada.

As of December 31, 2009, we had a drilling fleet that consisted of 341 marketable land-based drilling rigs. A
drilling rig includes the structure, power source and machinery necessary to cause a drill bit to penetrate the earth to
a depth desired by the customer. A drilling rig is considered marketable at a point in time if it is operating or can be
made ready to operate without significant capital expenditures. We also have a substantial inventory of drill pipe and
drilling rig components.

We provide pressure pumping services to oil and natural gas operators primarily in the Appalachian Basin.
These services consist primarily of well stimulation and cementing for completion of new wells and remedial work
on existing wells. We also own and invest in oil and natural gas assets as a working interest owner. Our oil and
natural gas interests are located primarily in Texas and New Mexico.

Prior to January 20, 2010, we provided drilling fluids, completion fluids and related services to oil and natural
gas operators offshore in the Gulf of Mexico and on land in Texas, New Mexico, Oklahoma and Louisiana. We
exited the drilling and completion fluids services business on January 20, 2010 and sold substantially all of the
assets, other than billed accounts receivable, of that business.

Industry Segments

Our revenues, operating profits and identifiable assets have been primarily attributable to four industry

segments:

(cid:129) contract drilling services,

(cid:129) pressure pumping services,

(cid:129) oil and natural gas exploration and production, and.

(cid:129) drilling and completion fluids services.

On January 20, 2010, we exited the drilling and completion fluids services business and ceased operations in
that segment. As a result of the sale of this business, the historical results of operations for this segment have been
reclassified and are presented as discontinued operations in this Report.

All of our industry segments had operating profits in 2007. In 2008, except for our drilling and completion
fluids services segment, all of our industry segments had operating profits. In 2009, our pressure pumping services
and oil and natural gas exploration and production segments had operating profits and our contract drilling services
segment had an operating loss.

See “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and Note 15
of Notes to Consolidated Financial Statements included as a part of Items 7 and 8, respectively, of this Report for
financial information pertaining to these industry segments.

Contract Drilling Operations

General — We market our contract drilling services to major and independent oil and natural gas operators. As

of December 31, 2009, we had 341 marketable land-based drilling rigs based in the following regions:

(cid:129) 73 in west Texas and southeastern New Mexico,

(cid:129) 100 in north central and east Texas, northern Louisiana and Mississippi,

(cid:129) 56 in the Rocky Mountain region (Colorado, Utah, Wyoming, Montana and North Dakota),

(cid:129) 49 in south Texas and southern Louisiana,

2

(cid:129) 28 in the Texas panhandle, Oklahoma and Arkansas,

(cid:129) 15 in the Appalachian Basin, and

(cid:129) 20 in western Canada.

Our marketable drilling rigs have rated maximum depth capabilities ranging from 5,000 feet to 30,000 feet. Of
these drilling rigs, 107 are electric rigs and 234 are mechanical rigs. An electric rig differs from a mechanical rig in
that the electric rig converts the diesel power (the sole energy source for a mechanical rig) into electricity to power
the rig. We also have a substantial inventory of drill pipe and drilling rig components, which may be used in the
activation of additional drilling rigs or as replacement parts for marketable rigs.

Drilling rigs are typically equipped with engines, drawworks, masts, pumps to circulate the drilling fluid,
blowout preventers, drill pipe and other related equipment. Over time, components on a drilling rig are replaced or
rebuilt. We spend significant funds each year as part of a program to modify, upgrade and maintain our drilling rigs
to ensure that our drilling equipment is competitive. We have spent $1.3 billion during the last three years on capital
expenditures to (1) build new land drilling rigs and (2) modify, upgrade and maintain our drilling fleet. During fiscal
years 2009, 2008 and 2007, we spent approximately $395 million, $361 million and $540 million, respectively, on
these capital expenditures.

Depth and complexity of the well and drill site conditions are the principal factors in determining the

specifications of the rig selected for a particular job.

Our contract drilling operations depend on the availability of drill pipe, drill bits, replacement parts and other
related rig equipment, fuel and qualified personnel. Some of these have been in short supply from time to time.

Drilling Contracts — Most of our drilling contracts are with established customers on a competitive bid or
negotiated basis. Our drilling contracts are either on a well-to-well basis or a term basis. Well-to-well contracts are
generally short-term in nature and cover the drilling of a single well or a series of wells. Term contracts are entered
into for a specified period of time (frequently one to three years) and provide for the use of the drilling rig to drill
multiple wells. During 2009, our average number of days to drill a well (which includes moving to the drill site,
rigging up and rigging down) was approximately 20 days.

Our drilling contracts obligate us to provide and operate a drilling rig and to pay certain operating expenses,
including wages of drilling personnel and necessary maintenance expenses. Most drilling contracts are subject to
termination by the customer on short notice and may or may not contain provisions for the payment of an early
termination fee to us in the event that the contract is terminated by the customer. Generally, we indemnify our
customers against claims by our employees and claims that might arise from surface pollution caused by spills of
fuel, lubricants and other solvents within our control. Generally, the customers indemnify us against claims that
might arise from other surface and subsurface pollution. Each drilling contract contains the actual terms setting
forth our rights and obligations and those of the customer, any of which rights and obligations may deviate from
what is customary due to industry conditions or other factors.

Our drilling contracts provide for payment on a daywork, footage, or turnkey basis, or a combination thereof.
In each case, we provide the rig and crews. Except for two wells drilled under footage contracts in 2009, all of the
wells drilled during the years ended December 31, 2009, 2008 and 2007 were drilled under daywork contracts. Our
bid for each job depends upon location, depth and anticipated complexity of the well, on-site drilling conditions,
equipment to be used, estimated risks involved, estimated duration of the job, availability of drilling rigs and other
factors particular to each proposed well.

Under daywork contracts, we provide the drilling rig and crew to the customer. The customer supervises the
drilling of the well. Our compensation is based on a contracted rate per day during the period the drilling rig is
utilized. We often receive a lower rate when the drilling rig is moving or when drilling operations are interrupted or
restricted by adverse weather conditions or other conditions beyond our control. Daywork contracts typically
provide separately for mobilization of the drilling rig. Except for two wells drilled under footage contracts in 2009,
all of the wells we drilled in 2009, 2008 and 2007 were under daywork contracts.

3

Under footage contracts, we contract to drill a well to a certain depth under specified conditions for a fixed
price per foot. The customer provides drilling fluids, casing, cementing and well design expertise. These contracts
require us to bear the cost of services and supplies that we provide until the well has been drilled to the agreed depth.
If we drill the well in less time than estimated, we have the opportunity to improve our profits over those that would
be attainable under a daywork contract. Profits are reduced and losses may be incurred if the well requires more
days to drill to the contracted depth than estimated. Footage contracts generally contain greater risks for a drilling
contractor than daywork contracts. Under footage contracts, the drilling contractor typically assumes certain risks
associated with loss of the well from fire, blowouts and other risks. We drilled two wells under footage contracts in
2009, and we did not drill any wells under footage contracts in 2008 or 2007.

Under turnkey contracts, we contract to drill a well to a certain depth under specified conditions for a fixed fee.
In a turnkey arrangement, we are required to bear the costs of services, supplies and equipment beyond those
typically provided under a footage contract. In addition to the drilling rig and crew, we are required to provide the
drilling and completion fluids, casing, cementing, and the technical well design and engineering services during the
drilling process. We also typically assume certain risks associated with drilling the well such as fires, blowouts,
cratering of the well bore and other such risks. Compensation occurs only when the agreed scope of the work has
been completed, which requires us to make larger up-front working capital commitments prior to receiving
payments under a turnkey drilling contract. Under a turnkey contract, we have the opportunity to improve our
profits if the drilling process goes as expected and there are no complications or time delays. Given the increased
exposure we have under a turnkey contract, however, profits can be significantly reduced and losses can be incurred
if complications or delays occur during the drilling process. Turnkey contracts generally involve the highest degree
of risk among the three different types of drilling contracts. Although we have entered into turnkey contracts in the
past, we did not enter into any turnkey contracts in the past three years.

Contract Drilling Activity — Information regarding our contract drilling activity for the last three years follows:

Year Ended December 31,
2008

2007

2009

91
Average rigs operating per day(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
243
Number of rigs operated during the year . . . . . . . . . . . . . . . . . . . . . . .
1,539
Number of wells drilled during the year . . . . . . . . . . . . . . . . . . . . . . . .
Number of operating days(2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33,394

254
315
4,218
93,068

244
338
4,237
89,095

(1) A rig is considered to be operating if it is earning revenue pursuant to a contract on a given day.

(2) Includes standby days under term contracts where revenue was earned but the rig was not working. The number

of these standby days under term contracts was 2,070 in 2009, 486 in 2008 and zero in 2007.

Drilling Rigs and Related Equipment — We estimate the depth capacity with respect to our marketable rigs as

of December 31, 2009 to be as follows:

Depth Rating (Ft.)

Number of Rigs
Canada

Total

U.S.

5,000 to 7,999 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . —
59
8,000 to 11,999 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
189
12,000 to 15,999 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
73
16,000 to 30,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Totals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

321

3
9
8
—

20

3
68
197
73

341

At December 31, 2009, we owned and operated 323 trucks and 417 trailers used to rig down, transport and rig up our
drilling rigs. Our ownership of trucks and trailers reduces our dependency upon third parties for these services and
generally enhances the efficiency of our contract drilling operations, particularly in periods of high drilling rig utilization.

Most repair and overhaul work to our drilling rig equipment is performed at our yard facilities located in Texas,

Oklahoma, Wyoming, Utah, Pennsylvania and western Canada.

4

Pressure Pumping Operations

General — We provide pressure pumping services to oil and natural gas operators primarily in the Appa-
lachian Basin. Pressure pumping services are primarily well stimulation and cementing for the completion of new
wells and remedial work on existing wells. Most wells drilled in the Appalachian Basin require some form of
fracturing or other stimulation to enhance the flow of oil and natural gas by pumping fluids under pressure into the
well bore. Appalachian Basin wells typically require cementing services. The cementing process inserts material
between the wall of the well bore and the casing to center and stabilize the casing.

Equipment — Our pressure pumping equipment at December 31, 2009 includes equipment used in providing

hydraulic and nitrogen fracturing services as well as cementing services as follows:

Hydraulic fracturing equipment:

(cid:129) 20 quintiplex pump trailers (45,000 hydraulic horsepower),

(cid:129) 69 triplex pumper trucks (82,800 hydraulic horsepower),

(cid:129) 35 blender trucks,

(cid:129) 4 blender trailers,

(cid:129) 32 bulk acid trucks/acid pumper trucks,

(cid:129) 70 bulk sand trucks,

(cid:129) 19 sand pneumatic trucks,

(cid:129) 6 sand pneumatic trailers,

(cid:129) 15 flatbed material trucks,

(cid:129) 30 connection trucks,

(cid:129) 1 shale fracturing hydration trailer,

(cid:129) 3 shale fracturing manifold trailers,

(cid:129) 1 shale fracturing iron trailer,

(cid:129) 15 shale fracturing sand field bins with conveyors, and

(cid:129) 3 shale fracturing large conveyors.

Nitrogen fracturing equipment:

(cid:129) 59 nitrogen pumper trucks (35,400 hydraulic horsepower),

(cid:129) 30 bulk nitrogen trucks, and

(cid:129) 9 bulk nitrogen tractor trailer combinations,

Cementing equipment:

(cid:129) 44 cement pumper trucks, and

(cid:129) 51 bulk cement trucks.

In addition to the equipment listed above, we had 45 tractors at December 31, 2009 which are used in all of the

lines of business within our pressure pumping segment.

Oil and Natural Gas Interests

We have been engaged in the development, exploration, acquisition and production of oil and natural gas.
Through October 31, 2007, we served as operator with respect to several properties and were actively involved in

5

the development, exploration, acquisition and production of oil and natural gas. Effective November 1, 2007, we
sold the related operations portion of our exploration and production business, which was the portion of our business
that actively managed the development, exploration, acquisition and production of oil and natural gas. We continue
to own and invest in oil and natural gas assets as a working interest owner. Our oil and natural gas interests are
located primarily in producing regions of Texas and New Mexico.

Drilling and Completion Fluids Operations

Prior to exiting the business in January 2010, we provided drilling fluids, completion fluids and related
services to oil and natural gas operators offshore in the Gulf of Mexico and on land in Texas, New Mexico,
Oklahoma and Louisiana.

Customers

The customers of each of our oil and natural gas service business segments are oil and natural gas operators.
Our customer base includes both major and independent oil and natural gas operators. During 2009, no single
customer accounted for 10% or more of our consolidated operating revenues.

Competition

Our contract drilling and pressure pumping businesses are highly competitive. Historically, available equip-
ment used in these businesses has frequently exceeded demand in our markets. The price for our services is a key
competitive factor in our markets, in part because equipment used in our businesses can be moved from one area to
another in response to market conditions. In addition to price, we believe availability and condition of equipment,
quality of personnel, service quality and safety record are key factors in determining which contractor is awarded a
job in the markets in which we operate. We expect that the market for land drilling and pressure pumping services
will continue to be competitive.

Government and Environmental Regulation

All of our operations and facilities are subject to numerous Federal, state, foreign, and local laws, rules and

regulations related to various aspects of our business, including:

(cid:129) drilling of oil and natural gas wells,
(cid:129) the relationships with our employees,
(cid:129) containment and disposal of hazardous materials, oilfield waste, other waste materials and acids,
(cid:129) use of underground storage tanks, and
(cid:129) use of underground injection wells.
To date, applicable environmental laws and regulations in the United States and Canada have not required the
expenditure of significant resources outside the ordinary course of business. We do not anticipate any material
capital expenditures for environmental control facilities or extraordinary expenditures to comply with environ-
mental rules and regulations in the foreseeable future. However, compliance costs under existing laws or under any
new requirements could become material, and we could incur liability in any instance of noncompliance.

Our business is generally affected by political developments and by Federal, state, foreign, and local laws and
regulations that relate to the oil and natural gas industry. The adoption of laws and regulations affecting the oil and
natural gas industry for economic, environmental and other policy reasons could increase costs relating to drilling
and production. They could have an adverse effect on our operations. Federal, state, foreign and local environmental
laws and regulations currently apply to our operations and may become more stringent in the future.

We believe we use operating and disposal practices that are standard in the industry. However, hydrocarbons
and other materials may have been disposed of or released in or under properties currently or formerly owned or
operated by us or our predecessors which may have resulted, or may result, in soil and groundwater contamination
in certain locations. Any contamination found on, under or originating from the properties may be subject to
remediation requirements under Federal, state, foreign and local laws and regulations. In addition, some of these
properties have been operated by third parties over whom we have no control of their treatment of hydrocarbon and
other materials or the manner in which they may have disposed of or released such materials. We could be required
to remove or remediate wastes disposed of or released by prior owners or operators. In addition, it is possible we
could be held responsible for oil and natural gas properties in which we own an interest but are not the operator.

6

Some of the environmental laws and regulations that are applicable to our business operations are discussed in the
following paragraphs, but the discussion does not cover all environmental laws and regulations that govern our operations.

In the United States, the Federal Comprehensive Environmental Response Compensation and Liability Act of

1980, as amended, commonly known as CERCLA, and comparable state statutes impose strict liability on:

(cid:129) owners and operators of sites, and

(cid:129) persons who disposed of or arranged for the disposal of “hazardous substances” found at sites.

The Federal Resource Conservation and Recovery Act (“RCRA”), as amended, and comparable state statutes
govern the disposal of “hazardous wastes.” Although CERCLA currently excludes petroleum from the definition of
“hazardous substances,” and RCRA also excludes certain classes of exploration and production wastes from
regulation, such exemptions by Congress under both CERCLA and RCRA may be deleted, limited, or modified in
the future. If such changes are made to CERCLA and/or RCRA, we could be required to remove and remediate
previously disposed of materials (including materials disposed of or released by prior owners or operators) from
properties (including ground water contaminated with hydrocarbons) and to perform removal or remedial actions to
prevent future contamination.

The Federal Water Pollution Control Act and the Oil Pollution Act of 1990, as amended, and implementing

regulations govern:

(cid:129) the prevention of discharges, including oil and produced water spills, and

(cid:129) liability for drainage into waters.

The Oil Pollution Act imposes strict liability for a comprehensive and expansive list of damages from an oil
spill into waters from facilities. Liability may be imposed for oil removal costs and a variety of public and private
damages. Penalties may also be imposed for violation of Federal safety, construction and operating regulations, and
for failure to report a spill or to cooperate fully in a clean-up.

The Oil Pollution Act also expands the authority and capability of the Federal government to direct and manage
oil spill clean-up and operations, and requires operators to prepare oil spill response plans in cases where it can
reasonably be expected that substantial harm will be done to the environment by discharges on or into navigable
waters. We have spill prevention control and countermeasure plans in place for our working interest in oil and natural
gas properties in each of the areas in which these interests are located. Failure to comply with ongoing requirements or
inadequate cooperation during a spill event may subject a responsible party, such as us, to civil or criminal actions.
Although the liability for owners and operators is the same under the Federal Water Pollution Act, the damages
recoverable under the Oil Pollution Act are potentially much greater and can include natural resource damages.

In Canada, a variety of Canadian federal, provincial and municipal laws and regulations impose, among other
things, restrictions, liabilities and obligations in connection with the generation, handling, use, storage, transportation,
treatment and disposal of hazardous substances and wastes and in connection with spills, releases and emissions of
various substances to the environment. These laws and regulations also require that facility sites and other properties
associated with our operations be operated, maintained, abandoned and reclaimed to the satisfaction of applicable
regulatory authorities. In addition, new projects or changes to existing projects may require the submission and approval
of environmental assessments or permit applications. These laws and regulations are subject to frequent change, and the
clear trend is to place increasingly stringent limitations on activities that may affect the environment.

Our operations are also subject to Federal, state, foreign and local laws, rules and regulations for the control of
air emissions, including the Federal Clean Air Act and the Canadian Environmental Protection Act. We are aware of
the increasing focus of local, state, national and international regulatory bodies on greenhouse gas (GHG) emissions
and climate change issues. We are also aware of legislation proposed by United States lawmakers and the Canadian
legislature to reduce GHG emissions, as well as GHG emissions regulations enacted by the U.S. Environmental
Protection Agency and the Canadian provinces of Alberta and British Columbia. We will continue to monitor and
assess any new policies, legislation or regulations in the areas where we operate to determine the impact of GHG
emissions and climate change on our operations and take appropriate actions, where necessary. Any direct and

7

indirect costs of meeting these requirements may adversely affect our business, results of operations and financial
condition.

Risks and Insurance

Our operations are subject to the many hazards inherent in the drilling business, including:

(cid:129) accidents at the work location,

(cid:129) blow-outs,

(cid:129) cratering,

(cid:129) fires, and

(cid:129) explosions.

These hazards could cause:

(cid:129) personal injury or death,

(cid:129) suspension of drilling operations, or

(cid:129) serious damage or destruction of the equipment involved and, in addition to environmental damage, could

cause substantial damage to producing formations and surrounding areas.

Damage to the environment, including property contamination in the form of either soil or ground water

contamination, could also result from our operations, particularly through:

(cid:129) oil or produced water spillage,

(cid:129) natural gas leaks, and

(cid:129) fires.

In addition, we could become subject to liability for reservoir damages. The occurrence of a significant event,
including pollution or environmental damages, could materially affect our operations, cash flows and financial condition.

As a protection against operating hazards, we maintain insurance coverage we believe to be adequate,

including:

(cid:129) insurance for fire, windstorm and other risks of physical loss to our rigs and other assets,

(cid:129) employer’s liability,

(cid:129) automobile liability,

(cid:129) commercial general liability insurance, and

(cid:129) workers compensation insurance.

We believe that we are adequately insured for bodily injury and property damage to others with respect to our
operations. Such insurance, however, may not be sufficient to protect us against liability for all consequences of:

(cid:129) personal injury,

(cid:129) well disasters,

(cid:129) extensive fire damage,

(cid:129) damage to the environment, or

(cid:129) other hazards.

We also carry insurance to cover physical damage to, or loss of, our drilling rigs. Such insurance does not,
however, cover the full replacement cost of the rigs, and we do not carry insurance against loss of earnings resulting

8

from such damage. In view of the difficulties that may be encountered in renewing such insurance at reasonable
rates, no assurance can be given that:

(cid:129) we will be able to maintain the type and amount of coverage that we believe to be adequate at reasonable

rates, or

(cid:129) any particular types of coverage will be available.

In addition to insurance coverage, we also attempt to obtain indemnification from our customers for certain
risks. These indemnity agreements typically require our customers to hold us harmless in the event of loss of
production or reservoir damage. These contractual indemnifications, if obtained, may not be supported by adequate
insurance maintained by the customer.

Employees

We had approximately 4,200 full-time employees at December 31, 2009. The number of employees fluctuates
depending on the current and expected demand for our services. We consider our employee relations to be
satisfactory. None of our employees are represented by a union.

Seasonality

Seasonality does not significantly affect our overall operations. However, our drilling operations in Canada
and, to a lesser extent, our pressure pumping operations in the Appalachian Basin, are subject to slow periods of
activity during the Spring thaw.

Raw Materials and Subcontractors

We use many suppliers of raw materials and services. These materials and services have historically been
available, although there is no assurance that such materials and services will continue to be available on favorable
terms or at all. We also utilize numerous independent subcontractors from various trades.

Item 1A. Risk Factors.

You should consider each of the following factors as well as the other information in this Report in evaluating
our business and our prospects. Additional risks and uncertainties not presently known to us or that we currently
consider immaterial may also impair our business operations. If any of the following risks actually occur, our
business and financial results could be harmed. You should also refer to the other information set forth in this
Report, including our financial statements and the related notes.

Global Economic Conditions May Adversely Affect Our Operating Results.

Since reaching a peak in June 2008, there has been a significant decline in oil and natural gas prices. Since that
time there has also been a significant deterioration in the global economic environment. As part of this deterioration,
there has been significant uncertainty in the capital markets and access to financing has been reduced. Due to these
conditions, our customers reduced or curtailed their drilling programs, which resulted in a decrease in demand for
our services. Furthermore, these factors have resulted in, and could continue to result in, certain of our customers
experiencing an inability to pay suppliers, including us, if they are not able to access capital to fund their operations.
Although the significant deterioration in the global economic environment appears to have recently stabilized to
some degree, our customers may not substantially increase their drilling programs unless there is more certainty
about global economic prospects. These conditions could have a material adverse effect on our business, financial
condition, cash flows and results of operations.

9

We are Dependent on the Oil and Natural Gas Industry and Market Prices for Oil and Natural Gas.
Declines in Oil and Natural Gas Prices Have Adversely Affected Our Operating Results.

Our revenue, profitability, financial condition and rate of growth are substantially dependent upon prevailing
prices for natural gas and, to a lesser extent, oil. For many years, oil and natural gas prices and markets have been
extremely volatile. Prices are affected by:

(cid:129) market supply and demand,

(cid:129) international military, political and economic conditions, and

(cid:129) the ability of the Organization of Petroleum Exporting Countries, commonly known as OPEC, to set and

maintain production and price targets.

All of these factors are beyond our control. During 2008, the monthly average market price of natural gas
peaked in June at $13.06 per Mcf before rapidly declining to an average of $5.99 per Mcf in December 2008. In
2009, the monthly average market price of natural gas declined further to a low of $3.06 per Mcf in September. This
decline in the market price of natural gas resulted in our customers significantly reducing their drilling activities
beginning in the fourth quarter of 2008, and drilling activities remained low throughout 2009. This reduction in
demand combined with the reactivation and construction of new land drilling rigs in the United States during the last
several years has resulted in excess capacity compared to demand. As a result of these factors, our average number
of rigs operating has declined significantly. We expect oil and natural gas prices to continue to be volatile and to
affect our financial condition, operations and ability to access sources of capital. Low market prices for natural gas
would likely result in demand for our drilling rigs remaining low and adversely affect our operating results,
financial condition and cash flows.

A General Excess of Operable Land Drilling Rigs and Increasing Rig Specialization May Adversely Affect
Our Utilization and Profit Margins.

The North American land drilling industry has experienced periods of downturn in demand over the last
decade. During these periods, there have been substantially more drilling rigs available than necessary to meet
demand. As a result, drilling contractors have had difficulty sustaining profit margins and, at times, have sustained
losses during the downturn periods.

In addition, unconventional resource plays have substantially increased recently and some drilling rigs are not
capable of drilling these wells efficiently. Accordingly, the utilization of some older technology drilling rigs may be
hampered by their lack of capability to successfully compete for this work. Other ongoing factors which could
continue to adversely affect utilization rates and pricing, even in an environment of high oil and natural gas prices
and increased drilling activity, include:

(cid:129) movement of drilling rigs from region to region,

(cid:129) reactivation of land-based drilling rigs, or

(cid:129) construction of new drilling rigs.

Construction of new drilling rigs increased significantly during the last five years. The addition of new drilling
rigs to the market and the recent decrease in demand has resulted in excess capacity. We cannot predict either the
future level of demand for our contract drilling services or future conditions in the oil and natural gas contract
drilling business.

Shortages of Drill Pipe, Replacement Parts and Other Related Rig Equipment Adversely Affects Our
Operating Results.

During periods of increased demand for drilling services, the industry has experienced shortages of drill pipe,
replacement parts and other related rig equipment. These shortages can cause the price of these items to increase
significantly and require that orders for the items be placed well in advance of expected use. In addition, any
interruption in supply due to vendor or other issues could result in significant delays in delivery of equipment. These

10

price increases and delays in delivery may require us to increase capital and repair expenditures in our contract
drilling segment. Severe shortages or delays in delivery could limit our ability to operate our drilling rigs.

The Oil Service Business Segments in Which We Operate Are Highly Competitive with Excess Capacity,
which Adversely Affects Our Operating Results.

Our land drilling and pressure pumping businesses are highly competitive. At times, available land drilling rigs
and pressure pumping equipment exceed the demand for such equipment. This excess capacity has resulted in
substantial competition for drilling and pressure pumping contracts. The fact that drilling rigs and pressure pumping
equipment are mobile and can be moved from one market to another in response to market conditions heightens the
competition in the industry.

We believe that price competition for drilling and pressure pumping contracts will continue due to the

existence of available rigs and pressure pumping equipment.

In recent years, many drilling and pressure pumping companies have consolidated or merged with other
companies. Although this consolidation has decreased the total number of competitors, we believe the competition
for drilling and pressure pumping services will continue to be intense.

Labor Shortages and Rising Labor Costs Adversely Affect Our Operating Results.

During periods of increasing demand for contract drilling and pressure pumping services, the industry
experiences shortages of qualified personnel. During these periods, our ability to attract and retain sufficient
qualified personnel to market and operate our drilling rigs and pressure pumping equipment is adversely affected,
which negatively impacts both our operations and profitability. Operationally, it is more difficult to hire qualified
personnel, which adversely affects our ability to mobilize inactive rigs and pressure pumping equipment in response
to the increased demand for such services. Additionally, wage rates for drilling and pressure pumping personnel are
likely to increase during periods of increasing demand, resulting in higher operating costs.

Growth Through the Building of New Rigs and Rig Acquisitions are Not Assured.

We have increased our drilling rig fleet in the past through mergers, acquisitions and rig construction. The land
drilling industry has experienced significant consolidation, and there can be no assurance that acquisition
opportunities will be available in the future. We are also likely to continue to face intense competition from
other companies for available acquisition opportunities. In addition, because improved technology has enhanced
the ability to recover oil and natural gas, contract drillers may continue to build new, high technology rigs.

There can be no assurance that we will:

(cid:129) have sufficient capital resources to complete additional acquisitions or build new rigs,

(cid:129) successfully integrate additional drilling rigs or other assets,

(cid:129) effectively manage the growth and increased size of our organization and drilling fleet,

(cid:129) successfully deploy idle, stacked or additional rigs,

(cid:129) maintain the crews necessary to operate additional drilling rigs, or

(cid:129) successfully improve our financial condition, results of operations, business or prospects as a result of any

completed acquisition or the building of new drilling rigs.

We may incur substantial indebtedness to finance future acquisitions or build new drilling rigs and also may
issue equity, convertible or debt securities in connection with any such acquisitions or building program. Debt
service requirements could represent a significant burden on our results of operations and financial condition, and
the issuance of additional equity would be dilutive to existing stockholders. Also, continued growth could strain our
management, operations, employees and other resources.

11

The Nature of our Business Operations Presents Inherent Risks of Loss that, if not Insured or Indemnified
Against, Could Adversely Affect Our Operating Results.

Our operations are subject to many hazards inherent in the contract drilling and pressure pumping businesses,
which in turn could cause personal injury or death, work stoppage, or serious damage to our equipment. Our
operations could also cause environmental and reservoir damages. We maintain insurance coverage and have
indemnification agreements with many of our customers. However, there is no assurance that such insurance or
indemnification agreements would adequately protect us against liability or losses from all consequences of these
hazards. Additionally, there can be no assurance that insurance would be available to cover any or all of these risks,
or, even if available, that insurance premiums or other costs would not rise significantly in the future, so as to make
the cost of such insurance prohibitive. Incurring a liability for which we are not fully insured or indemnified could
materially affect our business, financial condition and results of operations.

We have also elected in some cases to accept a greater amount of risk through increased deductibles on certain
insurance policies. For example, we maintain a $1.0 million per occurrence deductible on our workers’ compen-
sation, general liability and equipment insurance coverages.

Violations of Environmental Laws and Regulations Could Materially Adversely Affect Our Operating
Results.

All of our operations and facilities are subject to numerous Federal, state, foreign and local environmental
laws, rules and regulations, including, without limitation, laws concerning the containment and disposal of
hazardous substances, oil field waste and other waste materials, the use of underground storage tanks, and the
use of underground injection wells. The cost of compliance with these laws and regulations could be substantial. A
failure to comply with these requirements could expose us to substantial civil and criminal penalties. In addition,
environmental laws and regulations in the United States and Canada impose a variety of requirements on
“responsible parties” related to the prevention of oil spills and liability for damages from such spills. As an
owner and operator of land-based drilling rigs, we may be deemed to be a responsible party under these laws and
regulations.

We are aware of the increasing focus of local, state, national and international regulatory bodies on GHG
emissions and climate change issues. We are also aware of legislation proposed by United States lawmakers and the
Canadian legislature to reduce GHG emissions, as well as GHG emissions regulations enacted by the U.S. Envi-
ronmental Protection Agency and the Canadian provinces of Alberta and British Columbia. We will continue to
monitor and assess any new policies, legislation or regulations in the areas where we operate to determine the
impact of GHG emissions and climate change on our operations and take appropriate actions, where necessary. Any
direct and indirect costs of meeting these requirements may adversely affect our business, results of operations and
financial condition.

Anti-takeover Measures in Our Charter Documents and Under State Law Could Discourage an Acquisition
and Thereby Affect the Related Purchase Price.

We are a Delaware corporation subject to the Delaware General Corporation Law, including Section 203, an
anti-takeover law. We have also enacted certain anti-takeover measures, including a stockholders’ rights plan. In
addition, our Board of Directors has the authority to issue up to one million shares of preferred stock and to
determine the price, rights (including voting rights), conversion ratios, preferences and privileges of that stock
without further vote or action by the holders of the common stock. As a result of these measures and others, potential
acquirers might find it more difficult or be discouraged from attempting to effect an acquisition transaction with us.
This may deprive holders of our securities of certain opportunities to sell or otherwise dispose of the securities at
above-market prices pursuant to any such transactions.

Item 1B. Unresolved Staff Comments.

None.

12

Item 2. Properties

Our corporate headquarters comprises approximately 12,000 square feet of leased office space, and is located
at 450 Gears Road, Suite 500, Houston, Texas. Our telephone number at that address is (281) 765-7100. Our primary
administrative office is located in Snyder, Texas and includes approximately 37,000 square feet of office and storage
space.

Contract Drilling Operations — Our drilling services are supported by several offices and yard facilities
located throughout our areas of operations, including Texas, New Mexico, Oklahoma, Colorado, Utah, Wyoming,
Pennsylvania and western Canada.

Pressure Pumping — Our pressure pumping services are supported by several offices and yard facilities
located throughout our areas of operations including Pennsylvania, Ohio, New York, West Virginia, Kentucky,
Tennessee and Colorado.

Oil and Natural Gas Working Interests — Our interests in oil and natural gas properties are primarily located

in Texas and New Mexico.

We own our administrative offices in Snyder, Texas, as well as several of our other facilities. We also lease a
number of facilities, and we do not believe that any one of the leased facilities is individually material to our
operations. We believe that our existing facilities are suitable and adequate to meet our needs.

Item 3. Legal Proceedings.

We are party to various legal proceedings arising in the normal course of our business. We do not believe that
the outcome of these proceedings, either individually or in the aggregate, will have a material adverse effect on our
results of operations, cash flows or financial condition.

Item 4. Submission of Matters to a Vote of Security Holders.

None.

13

PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of

Equity Securities.

(a) Market Information

Our common stock, par value $0.01 per share, is publicly traded on the Nasdaq Global Select Market and is
quoted under the symbol “PTEN.” Our common stock is included in the S&P MidCap 400 Index and several other
market indices. The following table provides high and low sales prices of our common stock for the periods
indicated:

High

Low

2008:
First quarter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $26.38
36.40
Second quarter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
37.45
Third quarter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19.64
Fourth quarter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2009:
First quarter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $13.50
15.95
Second quarter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15.98
Third quarter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18.07
Fourth quarter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

$17.40
25.71
17.85
8.64

$ 7.49
8.56
11.38
14.20

(b) Holders

As of February 17, 2010, there were approximately 1,700 holders of record of our common stock.

(c) Dividends

We paid cash dividends during the years ended December 31, 2008 and 2009 as follows:

Per Share

Total
(in thousands)

2008:
Paid on March 28, 2008 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paid on June 27, 2008 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paid on September 29, 2008 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paid on December 29, 2008 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Total cash dividends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2009:
Paid on March 31, 2009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paid on June 30, 2009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paid on September 30, 2009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paid on December 30, 2009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Total cash dividends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

$0.12
0.16
0.16
0.16

$0.60

$0.05
0.05
0.05
0.05

$0.20

$18,493
25,011
24,803
24,558

$92,865

$ 7,655
7,675
7,675
7,676

$30,681

On February 10, 2010, our Board of Directors approved a cash dividend on our common stock in the amount of
$0.05 per share to be paid on March 30, 2010 to holders of record as of March 15, 2010. The amount and timing of
all future dividend payments, if any, is subject to the discretion of the Board of Directors and will depend upon
business conditions, results of operations, financial condition, terms of our credit facilities and other factors.

14

(d) Securities Authorized for Issuance Under Equity Compensation Plans

Equity compensation plan information as of December 31, 2009 follows:

Plan Category

Equity Compensation Plan Information

Number of
Securities to
be Issued upon
Exercise of
Outstanding
Options,
Warrants and
Rights
(a)

Weighted-Average
Exercise Price
of Outstanding
Options, Warrants
and Rights
(b)

Number of
Securities
Remaining Available
for Future Issuance
under Equity
Compensation Plans
(Excluding Securities
Reflected in
Column(a))
(c)

Equity compensation plans approved by

security holders(1) . . . . . . . . . . . . . . . . . .

6,627,634

Equity compensation plans not approved by

security holders(2) . . . . . . . . . . . . . . . . . .
Total . . . . . . . . . . . . . . . . . . . . . . . . . . . .

214,136
6,841,770

$20.50

$ 9.97
$20.17

2,545,524

—
2,545,524

(1) The Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, as amended (the “2005 Plan”), provides for
awards of incentive stock options, non-incentive stock options, tandem and freestanding stock appreciation
rights, restricted stock awards, other stock unit awards, performance share awards, performance unit awards
and dividend equivalents to key employees, officers and directors, which are subject to certain vesting and
forfeiture provisions. All options are granted with an exercise price equal to or greater than the fair market value
of the common stock at the time of grant. The vesting schedule and term are set by the Compensation
Committee of the Board of Directors. All securities remaining available for future issuance under equity
compensation plans approved by security holders in column (c) are available under this plan.

(2) The Amended and Restated Patterson-UTI Energy, Inc. 2001 Long-Term Incentive Plan (the “2001 Plan”) was
approved by the Board of Directors in July 2001. In connection with the approval of the 2005 Plan, the Board of
Directors approved a resolution that no further options, restricted stock or other awards would be granted under
any equity compensation plan, other than the 2005 Plan. The terms of the 2001 Plan provided for grants of stock
options, stock appreciation rights, shares of restricted stock and performance awards to eligible employees
other than officers and directors. No Incentive Stock Options could be awarded under the 2001 Plan. All options
were granted with an exercise price equal to or greater than the fair market value of the common stock at the
time of grant. The vesting schedule and term were set by the Compensation Committee of the Board of
Directors.

15

(e) Performance Graph

The following graph compares the cumulative stockholder return of our common stock for the period from
December 31, 2004 through December 31, 2009, with the cumulative total return of the Standard & Poors 500 Stock
Index, the Standard & Poors MidCap Index, the Oilfield Service Index and a peer group determined by us. Our 2008
peer group consists of BJ Services Company, Bronco Drilling Company, Inc., Helmerich & Payne, Inc., Nabors
Industries, Ltd., Pioneer Drilling Co., Superior Well Services, Inc. and Unit Corp. We evaluated our peer group for
2009 and determined that it was appropriate to remove Unit Corp. from the peer group as their drilling revenue as a
percentage of total revenue had fallen to a level that was no longer comparable to ours. All of the companies in our
peer group are providers of land-based drilling or pressure pumping services. The graph assumes investment of
$100 on December 31, 2004 and reinvestment of all dividends.

Comparison of Cumulative Total Returns
(in dollars)

$300

250

200

150

100

50

0

Patterson-UTI Energy, Inc.

S&P 500 Index

S&P MidCap

Oil Service Index (OSX)

Old Peer Group
New Peer Group

2004

2005

2006

2007

2008

2009

Company/Index

2004
($)

. . . . . . . . . . . . . . . . . 100.00
Patterson-UTI Energy, Inc.
2008 Peer Group Index . . . . . . . . . . . . . . . . . . . . 100.00
2009 Peer Group Index . . . . . . . . . . . . . . . . . . . . 100.00
S&P 500 Stock Index . . . . . . . . . . . . . . . . . . . . . 100.00
Oilfield Service Index (OSX). . . . . . . . . . . . . . . . 100.00
S&P MidCap Index . . . . . . . . . . . . . . . . . . . . . . . 100.00

Fiscal Year Ended December 31,

2005
($)

170.35
155.75
156.66
104.91
149.90
112.56

2006
($)

121.41
125.07
124.84
121.48
171.09
124.17

2007
($)

104.04
117.78
117.42
128.16
251.13
134.08

2008
($)

63.26
58.99
57.93
80.74
102.21
85.50

2009
($)

85.73
94.96
93.38
102.11
164.12
117.46

The foregoing graph is based on historical data and is not necessarily indicative of future performance. This
graph shall not be deemed to be “soliciting material” or to be “filed” with the SEC or subject to Regulations 14A or
14C under the Exchange Act or to the liabilities of Section 18 under such Act.

Item 6. Selected Financial Data.

Our selected consolidated financial data as of December 31, 2009, 2008, 2007, 2006 and 2005, and for each of
the five years in the period ended December 31, 2009 should be read in conjunction with “Management’s
Discussion and Analysis of Financial Condition and Results of Operations” and the Consolidated Financial
Statements and related Notes thereto, included as Items 7 and 8, respectively, of this Report. Certain reclassi-
fications have been made to the historical financial data to conform with the 2009 presentation. Due to the sale of

16

substantially all of the assets of our drilling and completion fluids business in January 2010, the results of operations
for that business have been reclassified and are presented as discontinued operations in all periods presented below.

2009

Years Ended December 31,
2008
2006
2007
(In thousands, except per share amounts)

2005

Statement of Operations Data:
Operating revenues:

Contract drilling . . . . . . . . . . . . . . . $ 599,287
161,441
Pressure pumping . . . . . . . . . . . . . .
21,218
Oil and natural gas . . . . . . . . . . . . .
781,946
Total . . . . . . . . . . . . . . . . . . . . . .

$1,804,026
217,494
42,360
2,063,880

$1,741,647
202,812
41,637
1,986,096

$2,169,370
145,671
39,187
2,354,228

$1,485,684
93,144
39,616
1,618,444

Operating costs and expenses:

Contract drilling . . . . . . . . . . . . . . .
Pressure pumping . . . . . . . . . . . . . .
Oil and natural gas . . . . . . . . . . . . .
Depreciation, depletion and

impairment . . . . . . . . . . . . . . . . .
Selling, general and administrative . .
Embezzlement costs (recoveries) . . .
Net loss (gain) on asset disposals . . .
Other operating expenses . . . . . . . . .
Total . . . . . . . . . . . . . . . . . . . . . .
Operating income (loss) . . . . . . . . . . .
Other income (expense) . . . . . . . . . . .
Income (loss) from continuing

operations before income taxes . . . .
Income tax expense (benefit) . . . . . . . .
Income (loss) from continuing

357,742
111,414
7,341

289,847
56,621
—
3,385
3,810
830,160
(48,214)
(3,341)

1,038,327
132,570
12,793

275,990
58,080
—
(4,163)
4,350
1,517,947
545,933
1,425

963,150
105,273
10,864

246,346
54,665
(43,955)
(16,432)
2,875
1,322,786
663,310
527

1,002,001
77,755
13,374

193,664
44,544
3,081
3,905
5,585
1,343,909
1,010,319
4,657

776,313
54,956
9,566

154,025
30,198
20,043
(1,200)
4,859
1,048,760
569,684
3,465

(51,555)
(17,595)

547,358
193,490

663,837
229,350

1,014,976
360,639

573,149
207,706

operations . . . . . . . . . . . . . . . . . . . . $ (33,960)

$ 353,868

$ 434,487

$ 654,337

$ 365,443

Income (loss) from continuing

operations per common share:

Basic. . . . . . . . . . . . . . . . . . . . . . $

Diluted . . . . . . . . . . . . . . . . . . . . $

Cash dividends per common share . . . . $

Weighted average number of common

shares outstanding:

(0.22)

(0.22)

0.20

$

$

$

2.29

2.27

0.60

$

$

$

2.78

2.75

0.44

$

$

$

3.94

3.89

0.28

$

$

$

2.14

2.11

0.16

Basic. . . . . . . . . . . . . . . . . . . . . .

Diluted . . . . . . . . . . . . . . . . . . . .

152,069

152,069

153,379

154,358

154,755

156,612

165,159

167,200

170,426

172,312

Balance Sheet Data:
Total assets . . . . . . . . . . . . . . . . . . . . . $2,662,152
Borrowings under line of credit . . . . . .
—
2,081,700
Stockholders’ equity . . . . . . . . . . . . . .
263,960
. . . . . . . . . . . . . . . . .
Working capital

$2,712,817
—
2,126,942
338,761

$2,465,199
50,000
1,896,030
227,577

$2,192,503
120,000
1,562,466
335,052

$1,795,781
—
1,367,011
382,448

17

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Management Overview — We are a leading provider of contract services to the North American oil and natural
gas industry. Our services primarily involve the drilling, on a contract basis, of land-based oil and natural gas wells
and, to a lesser extent, pressure pumping services. In addition to the aforementioned contract services, we also
invest, on a working interest basis, in oil and natural gas properties. For the three years ended December 31, 2009,
our operating revenues consisted of the following (dollars in thousands):

2009

2008

2007

Contract drilling. . . . . . . . . . . . . . . . .
Pressure pumping. . . . . . . . . . . . . . . .
Oil and natural gas. . . . . . . . . . . . . . .

$599,287
161,441
21,218

76% $1,804,026
217,494
21
42,360
3

87% $1,741,647
202,812
11
41,637
2

88%
10
2

$781,946

100% $2,063,880

100% $1,986,096

100%

We provide our contract services to oil and natural gas operators in many of the oil and natural gas producing
regions of North America. Our contract drilling operations are focused in various regions of Texas, New Mexico,
Oklahoma, Arkansas, Louisiana, Mississippi, Colorado, Utah, Wyoming, Montana, North Dakota, South Dakota,
Pennsylvania, and western Canada, while our pressure pumping services are focused primarily in the Appalachian
Basin. The oil and natural gas properties in which we hold interests are primarily located in Texas and New Mexico.

Typically, the profitability of our business is most readily assessed by two primary indicators in our contract
drilling segment: our average number of rigs operating and our average revenue per operating day. During 2009, our
average number of rigs operating was 91 compared to 254 in 2008 and 244 in 2007. Our average revenue per
operating day was $17,950 in 2009 compared to $19,380 in 2008 and $19,550 in 2007. We had a consolidated net
loss of $38.3 million for 2009 compared to consolidated net income of $347 million for 2008. This decrease was
primarily due to our contract drilling segment experiencing a significant decrease in the average number of rigs
operating as compared to 2008.

Our revenues, profitability and cash flows are highly dependent upon prevailing prices for natural gas and, to a
lesser extent, oil. During periods of improved commodity prices, the capital spending budgets of oil and natural gas
operators tend to expand, which generally results in increased demand for our contract services. Conversely, in
periods when these commodity prices deteriorate, the demand for our contract services generally weakens and we
experience downward pressure on pricing for our services. Since reaching a peak in June 2008, there has been a
significant decline in oil and natural gas prices. Since that time there has also been a substantial deterioration in the
global economic environment. As part of this deterioration, there has been substantial uncertainty in the capital
markets and access to financing has been reduced. Due to these conditions, our customers reduced or curtailed their
drilling programs, which resulted in a decrease in demand for our services, as evidenced by the decline in our
monthly average rigs operating from a high of 283 in October 2008 to a low of 60 in June 2009 before partially
recovering to 118 in December 2009. Furthermore, these factors have resulted in, and could continue to result in,
certain of our customers experiencing an inability to pay suppliers, including us, if they are not able to access capital
to fund their operations. We are also highly impacted by competition, the availability of excess equipment, labor
issues and various other factors that could materially adversely affect our business, financial condition, cash flows
and results of operations and which are more fully described above as “Risk Factors” in Item 1A of this Report.

We believe that the liquidity shown on our balance sheet as of December 31, 2009, which includes
approximately $264 million in working capital (including $49.9 million in cash) and approximately $194 million
available under our $240 million revolving credit facility, together with cash expected to be generated from
operations (including expected income tax refunds in 2010 of approximately $114 million resulting from the carry-
back of net operating losses), should provide us with sufficient ability to fund our current plans to build new
equipment, make improvements to our existing equipment, expand into new regions, pay cash dividends and
survive the current downturn in our industry. If we pursue opportunities for growth that require capital, we believe
we would be able to satisfy these needs through a combination of working capital, cash generated from operations,
borrowing capacity under our revolving credit facility or additional debt or equity financing. However, there can be
no assurance that such capital will be available on reasonable terms, if at all.

18

Commitments and Contingencies — As of December 31, 2009, we maintained letters of credit in the aggregate
amount of $46.3 million for the benefit of various insurance companies as collateral for retrospective premiums and
retained losses which could become payable under the terms of the underlying insurance contracts. These letters of
credit expire at various times during each calendar year and are typically renewed annually. As of December 31,
2009, no amounts had been drawn under the letters of credit.

As of December 31, 2009, we had commitments to purchase approximately $186 million of major equipment.

Trading and investing — We have not engaged in trading activities that include high-risk securities, such as
derivatives and non-exchange traded contracts. We invest cash primarily in highly liquid, short-term investments
such as overnight deposits and money market accounts.

Description of business — We conduct our contract drilling operations in Texas, New Mexico, Oklahoma,
Arkansas, Louisiana, Mississippi, Colorado, Utah, Wyoming, Montana, North Dakota, Pennsylvania, West Virginia
and western Canada. For the years ended December 31, 2009, 2008 and 2007, revenue earned in Canada was
$45.4 million, $88.5 million and $72.9 million, respectively. Additionally, we had long-lived assets located in
Canada of $69.2 million and $67.2 million as of December 31, 2009 and 2008, respectively. As of December 31,
2009, we had 341 marketable land-based drilling rigs. We provide pressure pumping services to oil and natural gas
operators primarily in the Appalachian Basin. These services consist primarily of well stimulation and cementing
for completion of new wells and remedial work on existing wells. Prior to the sale of substantially all of the assets of
our drilling fluids business on January 20, 2010, we provided drilling fluids, completion fluids and related services
to oil and natural gas operators offshore in the Gulf of Mexico and on land in Texas, New Mexico, Oklahoma and
Louisiana. Drilling and completion fluids are used by oil and natural gas operators during the drilling process to
control pressure when drilling oil and natural gas wells. Due to our exit from the drilling and completion fluids
business in January 2010, we have presented the results of that operating segment as discontinued operations in this
Report. We also invest, on a working interest basis, in oil and natural gas properties.

Critical Accounting Policies

In addition to established accounting policies, our consolidated financial statements are impacted by certain
estimates and assumptions made by management. The following is a discussion of our critical accounting policies
pertaining to property and equipment, oil and natural gas properties, goodwill, revenue recognition and the use of
estimates.

Property and equipment — Property and equipment, including betterments which extend the useful life of the
asset, are stated at cost. Maintenance and repairs are charged to expense when incurred. We provide for the
depreciation of our property and equipment using the straight-line method over the estimated useful lives. Our
method of depreciation does not change when equipment becomes idle; we continue to depreciate idled equipment
on a straight-line basis. No provision for salvage value is considered in determining depreciation of our property and
equipment. We review our long-lived assets, including property and equipment, for impairment whenever events or
changes in circumstances indicate that the carrying values of certain assets may not be recovered over their
estimated remaining useful lives. In connection with this review, assets are grouped at the lowest level at which
identifiable cash flows are largely independent of other asset groupings. The cyclical nature of our industry has
resulted in fluctuations in rig utilization over periods of time. Management believes that the contract drilling
industry will continue to be cyclical and rig utilization will fluctuate. Based on management’s expectations of future
trends, we estimate future cash flows over the life of the respective assets in our assessment of impairment. These
estimates of cash flows are based on historical cyclical trends in the industry as well as management’s expectations
regarding the continuation of these trends in the future. Provisions for asset impairment are charged against income
when estimated future cash flows, on an undiscounted basis, are less than the asset’s net book value. Any provision
for impairment is measured based on discounted cash flows.

On a periodic basis, we evaluate our fleet of drilling rigs for marketability. During 2009 and 2008, in
connection with our long term planning process, we evaluated our then-current fleet of marketable drilling rigs and
identified 23 and 22 rigs, respectively, that we determined would no longer be marketed as rigs. Additionally, in
2009, we identified one rig which would be recommissioned in a different configuration. The components
comprising these rigs were evaluated, and those components with continuing utility to our other marketed rigs

19

were transferred to other rigs or to our yards to be used as spare equipment. The remaining components of these rigs
were impaired and the associated net book value of $10.5 million in 2009 and $10.4 million in 2008 was expensed in
our consolidated statements of operations as an impairment charge.

In late 2008, we experienced a significant decrease in the number of our rigs operating and oil and natural gas
prices decreased significantly. These events were deemed by us to be triggering events that required us to perform an
assessment with respect to impairment of long-lived assets, including property and equipment, in our contract drilling
segment. With respect to these long-lived assets, we estimated future cash flows over the expected life of the long-
lived assets, which were comprised primarily of property and equipment, and determined that, on an undiscounted
basis, expected cash flows exceeded the carrying value of the long-lived assets. Based on this assessment, no
impairment was indicated. We again performed an assessment with respect to impairment of long-lived assets in our
contract drilling segment in 2009 based on undiscounted cash flows and determined that no impairment was indicated.
Impairment considerations in our oil and natural gas segment related to proved properties are discussed below. We
concluded that no triggering event had occurred with respect to our pressure pumping segment, as the level of activity
and revenue impact in that segment had not been affected to the same degree as in our other segments.

Oil and natural gas properties — Working interests in oil and natural gas properties are accounted for using
the successful efforts method of accounting. Under the successful efforts method of accounting, exploration costs
which result in the discovery of oil and natural gas reserves and all development costs are capitalized to the
appropriate well. Exploration costs which do not result in discovering oil and natural gas reserves are charged to
expense when such determination is made. Costs of exploratory wells are initially capitalized to wells in progress
until the outcome of the drilling is known. We review wells in progress quarterly to determine whether sufficient
progress is being made in assessing the reserves and the economic operating viability of the respective projects. If
no progress has been made in assessing the reserves and the economic operating viability of a project after one year
following the completion of drilling, we consider the costs of the well to be impaired and recognize the costs as
expense. Geological and geophysical costs, including seismic costs and costs to carry and retain undeveloped
properties, are charged to expense when incurred. The capitalized costs of both developmental and successful
exploratory type wells, consisting of lease and well equipment, lease acquisition costs and intangible development
costs, are depreciated, depleted and amortized on the units-of-production method, based on engineering estimates
of proved oil and natural gas reserves of each respective field.

We review our proved oil and natural gas properties for impairment when a triggering event occurs such as
downward revisions in reserve estimates or decreases in oil and natural gas prices. Proved properties are grouped by
field and undiscounted cash flow estimates are prepared based on our expectation of future commodity prices over the
lives of the respective fields. These estimates are then reviewed by an independent petroleum engineer. If the net book
value of a field exceeds its undiscounted cash flow estimate, impairment expense is measured and recognized as the
difference between its net book value and discounted cash flow. The discounted cash flow estimates used in measuring
impairment are based on our expectations of future commodity prices over the life of the respective field. Unproved oil
and natural gas properties are reviewed quarterly to assess potential impairment. The intent to drill, lease expiration
and abandonment of area are considered. Assessment of impairment is made on a lease-by-lease basis. If an unproved
property is determined to be impaired, then costs related to that property are expensed. Impairment expense results
from downward revisions in reserve estimates of proved properties and amounted to approximately $3.7 million,
$4.4 million and $3.9 million for the years ended December 31, 2009, 2008 and 2007, respectively, is included in
depreciation, depletion and impairment in the accompanying consolidated statements of operations.

Goodwill — Goodwill is considered to have an indefinite useful economic life and is not amortized. As such,
we assess impairment of our goodwill annually as of December 31 or on an interim basis if events or circumstances
indicate that the fair value of the asset has decreased below its carrying value. Goodwill impairment testing is
performed at the level of our reporting units. Our reporting units have been determined to be the same as our
operating segments.

In connection with our annual assessment of potential impairment of goodwill, we compare the fair value of
the reporting unit with its carrying value. If the fair value exceeds the carrying value, no impairment is indicated. If
the carrying value exceeds the fair value, we measure any impairment of goodwill in that reporting unit by
allocating the fair value to the identifiable assets and liabilities of the reporting unit based on their respective fair

20

values. Any excess unallocated fair value would equal the implied fair value of goodwill, and if that amount is below
the carrying value of goodwill, an impairment charge is recognized.

In connection with our annual goodwill impairment assessment performed as of December 31, 2008, we
performed an impairment test of goodwill recorded in our contract drilling and drilling and completion fluids
reporting units. In light of the adverse market conditions affecting our common stock price beginning in the fourth
quarter of 2008 and continuing into 2009, including a significant decrease in the number of our rigs operating and a
significant decline in oil and natural gas commodity prices, we utilized a discounted cash flow methodology to
estimate the fair values of our reporting units. In completing the first step of our analysis, we used a three-year
projection of discounted cash flows, plus a terminal value determined using the constant growth method to estimate
the fair value of our reporting units. In developing these fair value estimates, we applied key assumptions, including
an assumed discount rate of 13.99% for all reporting units, an assumed long-term growth rate of 3.50% for the
contract drilling reporting unit and an assumed long-term growth rate of 2.00% for the drilling and completion
fluids reporting unit.

Based on the results of the first step of the impairment test in 2008, we concluded that no impairment was
indicated in the contract drilling reporting unit as the estimated fair value of that reporting unit exceeded its carrying
value. An impairment was indicated in our drilling and completion fluids reporting unit as the estimated fair value
of that reporting unit was less than its carrying value. In validating this conclusion, we considered the results of our
long-lived asset impairment tests and performed sensitivity analyses of the key assumptions used in deriving the
respective fair values of our reporting units. We then performed the second step of the analysis of our drilling and
completion fluids reporting unit, which included allocating the estimated fair value to the identifiable tangible and
intangible assets and liabilities of this reporting unit based on their respective values. This allocation indicated no
residual value for goodwill, and accordingly we recorded an impairment charge of $9.964 million in our
December 31, 2008 statement of operations. We exited the drilling and completion fluids business on January 20,
2010, and the 2008 impairment charge is included in our loss from discontinued operations in our statement of
operations for the year ended December 31, 2008.

We again performed our annual goodwill impairment assessment as of December 31, 2009 related to the
remaining $86.2 million in goodwill recorded in our contract drilling reporting unit. In completing the first step of
our analysis, we used a three-year projection of discounted cash flows, plus a terminal value determined using the
constant growth method to estimate the fair value of our reporting unit. In developing this fair value estimate, we
applied key assumptions, including an assumed discount rate of 15.42% and an assumed long-term growth rate of
3.50%. Based on the results of the first step of the impairment test in 2009, we concluded that no impairment was
indicated in our contract drilling reporting unit as the estimated fair value of that reporting unit exceeded its carrying
value.

In the event that market conditions weaken, we may be required to record an impairment of goodwill in our

contract drilling reporting unit in the future, and such impairment could be material.

Revenue recognition — Revenues are recognized when services are performed, except for revenues earned
under turnkey contract drilling arrangements which are recognized using the completed contract method of
accounting. We follow the percentage-of-completion method of accounting for footage contract drilling arrange-
ments. Under the percentage-of-completion method, management estimates are relied upon in the determination of
the total estimated expenses to be incurred drilling the well. Due to the nature of turnkey contract drilling
arrangements and risks therein, we follow the completed contract method of accounting for such arrangements.
Under this method, revenues and expenses related to a well in progress are deferred and recognized in the period the
well is completed. Provisions for losses on incomplete or in-process wells are made when estimated total expenses
are expected to exceed total revenues. We recognize reimbursements received from third parties for out-of-pocket
expenses incurred as revenues and account for these out-of-pocket expenses as direct costs. Except for two wells
drilled under footage contacts in 2009, all of the wells we drilled in 2009, 2008 and 2007 were drilled under
daywork contracts.

Use of estimates — The preparation of financial statements in conformity with accounting principles generally
accepted in the United States of America requires management to make certain estimates and assumptions that
affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of

21

the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual
results could differ from such estimates.

Key estimates used by management include:

(cid:129) allowance for doubtful accounts,

(cid:129) depreciation and depletion,

(cid:129) goodwill and long-lived asset impairments, and

(cid:129) reserves for self-insured levels of insurance coverage.

For additional information on our accounting policies, see Note 1 of Notes to Consolidated Financial

Statements included as a part of Item 8 of this Report.

Liquidity and Capital Resources

As of December 31, 2009, we had working capital of $264 million, including cash and cash equivalents of

$49.9 million. During 2009, our sources of cash flow included:

(cid:129) $454 million from operating activities,

(cid:129) $3.4 million in proceeds from the disposal of property and equipment, and

During 2009, we used $30.7 million to pay dividends on our common stock, $6.2 million to pay issuance costs
related to our revolving credit facility, $1.6 million to repurchase shares of our common stock and $453 million:

(cid:129) to build new drilling rigs,

(cid:129) to make capital expenditures for the betterment and refurbishment of our drilling rigs,

(cid:129) to acquire and procure drilling equipment and facilities to support our drilling operations,

(cid:129) to fund capital expenditures for our pressure pumping segment, and

(cid:129) to fund investments in oil and natural gas properties on a working interest basis.

We paid cash dividends during the year ended December 31, 2009 as follows:

Paid on March 31, 2009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paid on June 30, 2009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paid on September 30, 2009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paid on December 30, 2009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Total cash dividends. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Per Share

$0.05
0.05
0.05
0.05

$0.20

Total
(In thousands)
$ 7,655
7,675
7,675
7,676

$30,681

On February 10, 2010, our Board of Directors approved a cash dividend on our common stock in the amount of
$0.05 per share to be paid on March 30, 2010 to holders of record as of March 15, 2010. The amount and timing of
all future dividend payments, if any, is subject to the discretion of the Board of Directors and will depend upon
business conditions, results of operations, financial condition, terms of our credit facilities and other factors.

On August 1, 2007, our Board of Directors approved a stock buyback program (“Program”), authorizing
purchases of up to $250 million of our common stock in open market or privately negotiated transactions. During
the year ended December 31, 2009, we purchased 5,715 shares of our common stock under the Program at a cost of
approximately $79,000. As of December 31, 2009, we are authorized to purchase approximately $113 million of
our outstanding common stock under the Program.

We have an unsecured revolving credit facility with a maximum borrowing and letter of credit capacity of
$240 million. Interest is paid on the outstanding principal amount of borrowings under the revolving credit facility
at a floating rate based on, at our election, LIBOR or a base rate. The margin on LIBOR loans ranges from 3.00% to

22

4.00% and the margin on base rate loans ranges from 2.00% to 3.00%, based on our debt to capitalization ratio. Any
outstanding borrowings must be repaid at maturity on January 31, 2012 and letters of credit may remain in effect up
to six months after such maturity date. As of December 31, 2009, we had no borrowings outstanding under the
revolving credit facility. We had $46.3 million in letters of credit outstanding at December 31, 2009, and as a result,
had available borrowing capacity of approximately $194 million at such date.

There are customary representations, warranties, restrictions and covenants associated with the revolving
credit facility. Financial covenants provide for a maximum debt to capitalization ratio and a minimum interest
coverage ratio. As of December 31, 2009, the maximum debt to capitalization ratio was 35% and the minimum
interest coverage ratio was 3.00 to 1. We were in compliance with these financial covenants as of December 31,
2009. We do not expect that the restrictions and covenants will impact our ability to operate or react to opportunities
that might arise.

We believe that the current level of cash, short-term investments and borrowing capacity available under our
revolving credit facility, together with cash expected to be generated from operations (including expected income
tax refunds in 2010 of approximately $114 million resulting from the carry-back of net operating losses), should be
sufficient to meet our current capital needs. From time to time, opportunities to expand our business, including
acquisitions and the building of new rigs are evaluated. The timing, size or success of any acquisition and the
associated capital commitments are unpredictable. If we pursue opportunities for growth that require capital, we
believe we would be able to satisfy these needs through a combination of working capital, cash generated from
operations, borrowing capacity under our revolving credit facility or additional debt or equity financing. However,
there can be no assurance that such capital will be available on reasonable terms, if at all.

Contractual Obligations

The following table presents information with respect to our contractual obligations as of December 31, 2009

(dollars in thousands):

Payments due by period

Total

Less Than 1
Year

1-3 Years

3-5 Years

More Than 5
Years

Borrowings under revolving credit

facility(1) . . . . . . . . . . . . . . . . . . . $

— $

—

Commitments to purchase

equipment(2). . . . . . . . . . . . . . . . .

186,220

186,220

$186,220

$186,220

$—

—

$—

$—

—

$—

$—

—

$—

(1) No borrowings were outstanding on our revolving credit facility as of December 31, 2009. Our revolving credit

facility matures on January 31, 2012.

(2) Represents commitments to purchase major equipment to be delivered in 2010 based on expected delivery

dates.

Off-Balance Sheet Arrangements

We had no off-balance sheet arrangements at December 31, 2009.

23

Results of Operations

Comparison of the years ended December 31, 2009 and 2008

The following tables summarize operations by business segment for the years ended December 31, 2009 and

2008:

Contract Drilling

2009

% Change

Revenues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Direct operating costs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Selling, general and administrative . . . . . . . . . . . . . . . . . . . . .
Depreciation and impairment . . . . . . . . . . . . . . . . . . . . . . . . .
Operating income (loss) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating days . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Average revenue per operating day . . . . . . . . . . . . . . . . . . . . .
Average direct operating costs per operating day. . . . . . . . . . .
Average rigs operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Capital expenditures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Year Ended December 31,
2008
(Dollars in thousands)
$1,804,026
$1,038,327
5,363
$
$ 239,700
$ 520,636
93,068
19.38
11.16
254
$ 360,645

$599,287
$357,742
$ 4,340
$248,424
$ (11,219)
33,394
$ 17.95
$ 10.71
91
$395,376

$
$

(66.8)%
(65.5)%
(19.1)%
3.6%
N/A%
(64.1)%
(7.4)%
(4.0)%
(64.2)%
9.6%

The demand for our contract drilling services is impacted by the market price of natural gas and, to a lesser
extent, oil. The reactivation and construction of new land drilling rigs in the United States in recent years has also
contributed to an excess capacity of land drilling rigs compared to demand. The average market price of natural gas
for each of the fiscal quarters and full years in 2009 and 2008 follow:

1st Quarter

2nd Quarter

3rd Quarter

4th Quarter

Year

2008:
Average natural gas price(1) . . . . . . .
2009:
Average natural gas price(1) . . . . . . .

$8.92

$11.74

$9.28

$6.60

$9.13

$4.71

$ 3.82

$3.26

$4.46

$4.06

(1) The average natural gas price represents the Henry Hub Spot price as reported by the United States Energy

Information Administration.

Revenues and direct operating costs decreased in 2009 compared to 2008 primarily as a result of a decrease in
the number of operating days. The decrease in operating days was due to decreased demand largely caused by lower
commodity prices for natural gas and oil. Our average number of rigs operating during 2009 included an average of
approximately six rigs under term contracts that earned standby revenues of $22.3 million. This represented an
increase from an average of approximately one rig under term contract that earned standby revenues of $4.7 million
in 2008. Rigs on standby earn a discounted dayrate as they do not have crews and have lower costs. We recognized
approximately $8.0 million of revenues during 2009 from the early termination of drilling contracts compared to
approximately $1.3 million in 2008. Average revenue per operating day decreased in 2009 primarily due to
decreases in dayrates for rigs that were operating in the spot market and the expiration of term contracts that were
entered into at higher rates. Average direct operating costs per operating day decreased in 2009 primarily due to
decreases in labor and repair costs. Significant capital expenditures were incurred in 2009 and 2008 to build new
drilling rigs, to modify and upgrade our drilling rigs and to acquire additional related equipment such as drill pipe,
drill collars, engines, fluid circulating systems, rig hoisting systems and safety enhancement equipment. Depre-
ciation and impairment expense includes approximately $10.5 million in 2009 and approximately $10.4 million in
2008 related to the impairment of drilling equipment primarily related to drilling rigs that were removed from our

24

marketable fleet. We removed 23 rigs from our marketable fleet in 2009 and removed 22 rigs from our marketable
fleet in 2008. Depreciation expense increased as a result of capital expenditures.

Pressure Pumping

Revenues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Direct operating costs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Selling, general and administrative . . . . . . . . . . . . . . . . . . . . . .
Depreciation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating income . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total jobs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Average revenue per job . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Average direct operating costs per job . . . . . . . . . . . . . . . . . . . .
Capital expenditures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

% Change

2009

Year Ended December 31,
2008
(Dollars in thousands)
$217,494
$132,570
$ 23,305
$ 19,600
$ 42,019
12,900
16.86
$
$
10.28
$ 61,289

$161,441
$111,414
$ 21,421
$ 27,589
$ 1,017
7,265
$ 22.22
$ 15.34
$ 43,144

(25.8)%
(16.0)%
(8.1)%
40.8%
(97.6)%
(43.7)%
31.8%
49.2%
(29.6)%

Our customers have increased their focus on the emerging development of unconventional reservoirs in the
Appalachian Basin and the larger jobs associated therewith. As a result of this focus on unconventional reservoirs
and lower commodity prices, we experienced a decrease in smaller traditional pressure pumping jobs, which
contributed to the overall decrease in the number of total jobs. Revenues and direct operating costs decreased as a
result of the decrease in the number of total jobs. Increased average revenue per job reflects an increase in the
proportion of larger jobs to total jobs, which was driven by demand for services associated with unconventional
reservoirs, partially offset by the impact of reduced pricing. Average direct operating costs per job increased due to
the increase in larger jobs and as a result of fixed costs being spread over a significantly reduced number of total
jobs. In anticipation of increased activity associated with the unconventional reservoirs in the Appalachian Basin,
we have added facilities, equipment and personnel in recent years. Delays in the development of these reservoirs
and lower commodity prices have caused a slower increase in customer activity than we had expected, negatively
impacting the profitability of this business. Selling, general and administrative expenses decreased primarily as a
result of cost containment efforts during the downturn in the industry. Significant capital expenditures have been
incurred in recent years to add capacity. Depreciation expense increased as a result of capital expenditures.

Oil and Natural Gas Production and Exploration

2009

Revenues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $21,218
Direct operating costs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 7,341
Depreciation, depletion and impairment . . . . . . . . . . . . . . . . . . . . $12,927
Operating income . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $
950
Capital expenditures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 7,341
Average net daily oil production (Bbls) . . . . . . . . . . . . . . . . . . . . .
761
3,225
Average net daily gas production (Mcf) . . . . . . . . . . . . . . . . . . . .
Average oil sales price (per Bbl). . . . . . . . . . . . . . . . . . . . . . . . . . $ 58.09
4.32
Average gas sales price (per Mcf) . . . . . . . . . . . . . . . . . . . . . . . . . $

% Change

Year Ended December 31,
2008
(Dollars in thousands, except
commodity prices)
$42,360
$12,793
$15,856
$13,711
$22,981
801
3,755
$ 98.70
9.77
$

(49.9)%
(42.6)%
(18.5)%
(93.1)%
(68.1)%
(5.0)%
(14.1)%
(41.1)%
(55.8)%

Revenues decreased due to lower average sales prices and lower average net daily production of oil and natural
gas. Average net daily oil and natural gas production decreased primarily due to production declines on existing
wells. Direct operating costs decreased primarily due to decreases in seismic expenses as well as decreased
production taxes and other production costs. Depreciation, depletion and impairment expense in 2009 includes
approximately $3.7 million incurred to impair certain oil and natural gas properties compared to approximately
$4.4 million incurred to impair certain oil and natural gas properties in 2008. Depletion expense decreased
approximately $2.3 million primarily due to lower production and the impact of decreases in the carrying value of

25

properties resulting from previous impairment charges. Capital expenditures decreased in 2009 as a result of
declines in commodity prices.

Corporate and Other

Selling, general and administrative . . . . . . . . . . . . . . . . . . . . . . . . $30,860
Depreciation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $
907
Other operating expenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 3,810
Net (gain) loss on asset disposals . . . . . . . . . . . . . . . . . . . . . . . . . $ 3,385
Interest income . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $
381
Interest expense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 4,148
426
Other income . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $
Capital expenditures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 6,785

2009

% Change

Year Ended December 31,
2008
(Dollars in thousands)
$29,412
$
834
$ 4,350
$ (4,163)
$ 1,553
630
$
502
$
511
$

4.9%
8.8%
(12.4)%
N/A%
(75.5)%
558.4%
(15.1)%
1,227.8%

Selling, general and administrative expense increased in 2009 primarily as a result of increased professional
fees. Other operating expenses decreased due to a decrease in bad debt expense. Gains and losses on the disposal of
assets are treated as part of our corporate activities because such transactions relate to corporate strategy decisions
of our executive management group. Losses on asset disposals in 2009 were primarily related to the disposal of
contract drilling equipment. Gains on asset disposals in 2008 were primarily related to gains on the sale of contract
drilling equipment and the sale of oil and natural gas properties. Interest expense increased in 2009 due to the
amortization of revolving credit facility issuance costs and increased fees associated with outstanding letters of
credit and the unused portion of the revolving credit facility. Capital expenditures increased in 2009 due to the
purchase and ongoing implementation of a new enterprise resource planning system.

Discontinued Operations:

2009

% Change

Year Ended December 31,
2008
(Dollars in thousands)
$145,246
$126,900

(45.1)%
(41.5)%

Drilling and completion fluids revenue . . . . . . . . . . . . . . . . . . . . $79,786
Drilling and completion fluids direct operating costs . . . . . . . . . . $74,180
Drilling and completion fluids selling, general and

$ 10,110
administrative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 7,192
2,830
Drilling and completion fluids depreciation . . . . . . . . . . . . . . . . . $ 2,287
$
9,964
Goodwill impairment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ — $
—
$
Impairment of assets held for sale . . . . . . . . . . . . . . . . . . . . . . . . $ 1,900
(155)
$
Net gain on asset disposals/retirements . . . . . . . . . . . . . . . . . . . . $ (125)
—
Other operating expense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $
$
890
7
Net interest expense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ — $
$
Income tax expense (benefit) . . . . . . . . . . . . . . . . . . . . . . . . . . . $ (2,208)
2,389
$ (6,799)
Loss from discontinued operations, net of income taxes . . . . . . . . $ (4,330)

(28.9)%
(29.2)%
(100.0)%
N/A%
(19.4)%
N/A%
(100.0)%
N/A%
36.3%

On January 20, 2010, we exited our drilling and completion fluids services business which had previously been
presented as one of our reportable operating segments. On that date, our wholly owned subsidiary, Ambar Lone Star
Fluids Services LLC, completed the sale of substantially all of its assets, excluding billed accounts receivable. Upon
our exit from this business, we classified our drilling and completion fluids operating segment as a discontinued
operation. Accordingly, the assets and liabilities of this business, along with its results of operations, have been
reclassified for all periods presented. Drilling and completion fluids revenue and direct operating costs decreased in
2009 due to decreased sales volume both on land and offshore in the Gulf of Mexico. Drilling and completion fluids
selling, general and administrative expenses decreased in 2009 primarily due to a decrease in compensation costs
for sales and support personnel due to headcount reductions. Goodwill impairment was recognized in the drilling
and completion fluids reporting unit in 2008 as a result of our annual impairment testing which indicated that the
fair value of goodwill in that reporting unit was zero. Impairment of assets held for sale in 2009 of $1.9 million
represents the adjustment recorded to reduce the carrying value of the assets sold to their fair value less transaction

26

costs as of December 31, 2009. In 2008, income tax expense was recognized despite a pre-tax loss in the drilling and
completion fluids business due to the fact that the goodwill impairment recorded in that year was not deductible for
tax purposes.

Comparison of the years ended December 31, 2008 and 2007

The following tables summarize operations by business segment for the years ended December 31, 2008 and

2007:

Contract Drilling

Year Ended December 31,

2008

2007

% Change

Revenues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $1,804,026
Direct operating costs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $1,038,327
5,363
Selling, general and administrative . . . . . . . . . . . . . . . . . . . $
Depreciation and impairment . . . . . . . . . . . . . . . . . . . . . . . . $ 239,700
Operating income . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 520,636
93,068
Operating days . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19.38
Average revenue per operating day . . . . . . . . . . . . . . . . . . . $
11.16
Average direct operating costs per operating day . . . . . . . . . $
Average rigs operating . . . . . . . . . . . . . . . . . . . . . . . . . . . .
254
Capital expenditures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 360,645

(Dollars in thousands)
$1,741,647
$ 963,150
5,893
$
$ 213,812
$ 558,792
89,095
19.55
10.81
244
$ 539,506

$
$

3.6%
7.8%
(9.0)%
12.1%
(6.8)%
4.5%
(0.9)%
3.2%
4.1%
(33.2)%

The demand for our contract drilling services is impacted by the market price of natural gas and, to a lesser
extent, oil. The reactivation and construction of new land drilling rigs in the United States in recent years has also
contributed to an excess capacity of land drilling rigs compared to demand. The average market price of natural gas
for each of the fiscal quarters and full years in 2008 and 2007 follow:

1st Quarter

2nd Quarter

3rd Quarter

4th Quarter

Year

2007:
Average natural gas price(1) . . . . . . .
2008:
Average natural gas price(1) . . . . . . .

$7.44

$ 7.76

$6.35

$7.19

$7.18

$8.92

$11.74

$9.28

$6.60

$9.13

(1) The average natural gas price represents the Henry Hub Spot price as reported by the United States Energy

Information Administration.

Revenues and direct operating costs increased in 2008 compared to 2007 primarily as a result of an increase in
the number of operating days. The increase in operating days was due to increased demand caused by higher prices
for natural gas during most of 2008 compared to 2007. Average revenue per operating day in 2008 was relatively flat
compared to 2007. Average direct operating costs per operating day increased in 2008 due to incremental costs
incurred to activate idle drilling rigs as well as increases in labor, repairs and other related costs. Significant capital
expenditures were incurred in 2008 and 2007 to build new drilling rigs, to modify and upgrade our drilling rigs and
to acquire additional related equipment such as drill pipe, drill collars, engines, fluid circulating systems, rig
hoisting systems and safety enhancement equipment. Depreciation and impairment expense in 2008 includes
approximately $10.4 million related to the impairment of drilling equipment primarily related to drilling rigs

27

that were removed from our marketable fleet. We removed 22 rigs from our marketable fleet in 2008. Depreciation
expense increased as a result of capital expenditures.

Pressure Pumping

Revenues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Direct operating costs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Selling, general and administrative . . . . . . . . . . . . . . . . . . . . . .
Depreciation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating income . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total jobs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Average revenue per job . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Average direct operating costs per job . . . . . . . . . . . . . . . . . . . .
Capital expenditures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

% Change

2008

Year Ended December 31,
2007
(Dollars in thousands)
$202,812
$105,273
$ 18,971
$ 14,311
$ 64,257
14,094
14.39
$
$
7.47
$ 47,582

$217,494
$132,570
$ 23,305
$ 19,600
$ 42,019
12,900
$ 16.86
$ 10.28
$ 61,289

7.2%
25.9%
22.8%
37.0%
(34.6)%
(8.5)%
17.2%
37.6%
28.8%

Our customers increased their focus on the emerging development of unconventional reservoirs in the
Appalachian Basin and the larger jobs associated therewith. As a result of this focus on unconventional reservoirs,
we experienced a decrease in smaller traditional pressure pumping jobs in 2008, which resulted in an overall
decrease in the number of total jobs. Revenues and direct operating costs increased as a result of an increase in the
average revenue and average direct operating costs per job. Increased average revenue per job was due to an increase
in the proportion of larger jobs to total jobs, which was driven by demand for services associated with uncon-
ventional reservoirs. Average direct operating costs per job increased due to the increase in larger jobs and as a result
of increases in compensation, maintenance and the cost of materials used in our operations. In anticipation of
increased activity associated with the unconventional reservoirs in the Appalachian Basin, we added facilities,
equipment and personnel. Delays in the development of these reservoirs caused a slower increase in customer
activity than we had expected, negatively impacting the profitability of this business. Selling, general and
administrative expense increased primarily as a result of expenses to support expanded operations of this segment.
Significant capital expenditures were incurred to add capacity, expand our areas of operation and modify and
upgrade existing equipment. Depreciation expense increased as a result of capital expenditures.

2008

% Change

Oil and Natural Gas Production and Exploration

Year Ended December 31,
2007
(Dollars in thousands, except
commodity prices)
$41,637
Revenues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $42,360
Direct operating costs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $12,793
$10,864
Selling, general and administrative . . . . . . . . . . . . . . . . . . . . . . . . $ — $ 2,365
$17,410
Depreciation, depletion and impairment . . . . . . . . . . . . . . . . . . . . $15,856
$10,998
Operating income . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $13,711
$17,516
Capital expenditures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $22,981
971
801
Average net daily oil production (Bbls) . . . . . . . . . . . . . . . . . . . . .
4,996
Average net daily gas production (Mcf) . . . . . . . . . . . . . . . . . . . .
3,755
$ 68.82
Average oil sales price (per Bbl). . . . . . . . . . . . . . . . . . . . . . . . . . $ 98.70
7.37
$
9.77
Average gas sales price (per Mcf) . . . . . . . . . . . . . . . . . . . . . . . . . $

1.7%
17.8%
(100.0)%
(8.9)%
24.7%
31.2%
(17.5)%
(24.8)%
43.4%
32.6%

Revenues increased due to higher average sales prices of oil and natural gas. This increase was partially offset
by a decrease in the average net daily production of oil and natural gas and by the elimination of well operations
revenue due to the fourth quarter 2007 sale of the operating responsibilities associated with oil and natural gas wells.
Average net daily oil and natural gas production decreased primarily due to the sale of properties in 2007 and
production declines. Direct operating costs increased due to an increase in seismic expenses as well as increased
production taxes and other production costs. Selling, general and administrative expense decreased in 2008 due to
the sale of the operating responsibilities mentioned above and the resulting elimination of headcount in this

28

segment. Depreciation, depletion and impairment expense in 2008 includes approximately $4.4 million incurred to
impair certain oil and natural gas properties compared to approximately $3.9 million incurred to impair certain oil
and natural gas properties in 2007. Depletion expense decreased approximately $1.9 million primarily due to the
sale of certain properties in 2007.

2008

% Change

Corporate and Other

Year Ended December 31,
2007
(Dollars in thousands)
$ 27,436
Selling, general and administrative . . . . . . . . . . . . . . . . . . . . . . . $29,412
813
$
834
Depreciation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $
Other operating expenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 4,350
$ 2,875
Embezzlement recoveries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ — $(43,955)
$(16,432)
Net gain on asset disposals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ (4,163)
$ 2,351
Interest income . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 1,553
$ 2,187
630
Interest expense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $
363
$
502
Other income . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $
—
$
511
Capital expenditures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $

7.2%
2.6%
51.3%
(100.0)%
(74.7)%
(33.9)%
(71.2)%
38.3%
N/A%

Selling, general and administrative expense increased primarily as a result of additional compensation expense
and an increase in payroll tax expense associated with the exercise of stock options during 2008. Other operating
expenses increased due to an increase in bad debt expense. Gains and losses on the disposal of assets are considered
as part of our corporate activities because such transactions relate to corporate strategy decisions of our executive
management group. Gains on asset disposals in 2008 were primarily related to gains on the sale of contract drilling
equipment and the sale of oil and natural gas properties. Gains on asset disposals in 2007 were primarily related to
the sale of oil and natural gas properties.

In November 2005, we discovered that our former Chief Financial Officer, Jonathan D. Nelson (“Nelson”), had
fraudulently diverted approximately $77.5 million in Company funds for his own benefit during the period from
1998 through 2005. As a result, the Audit Committee of the Board of Directors commenced an investigation into
Nelson’s activities and retained independent counsel and independent forensic accountants to assist with the
investigation. Nelson has been sentenced and is serving a term of imprisonment arising out of his embezzlement. A
receiver was appointed to take control of and liquidate the assets of Nelson. In May 2007, the court approved a plan
of distribution for the assets recovered by the receiver. We recovered a total of approximately $44.5 million pursuant
to the approved plan, and we recognized this recovery in our consolidated statement of income in 2007, net of
professional fees incurred as a result of the embezzlement.

Discontinued Operations:

Drilling and completion fluids revenue . . . . . . . . . . . . . . . . . . .
Drilling and completion fluids direct operating costs . . . . . . . . .
Drilling and completion fluids selling, general and

administrative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drilling and completion fluids depreciation . . . . . . . . . . . . . . . .
Goodwill impairment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Net gain on asset disposals/retirements . . . . . . . . . . . . . . . . . . .
Other operating benefit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Net interest expense (income) . . . . . . . . . . . . . . . . . . . . . . . . . .
Income tax expense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Income (loss) from discontinued operations, net of income

2008

Year Ended December 31,
2007
(Dollars in thousands)
$128,098
$108,752

$145,246
$126,900

% Change

13.4%
16.7%

$
$ 10,110
$
$ 2,830
$
$ 9,964
$
$
(155)
— $
$
$
$
7
$
$ 2,389

9,958
2,860
—
(113)
(325)
(4)
2,818

1.5%
(1.0)%
N/A%
37.2%
(100.0)%
N/A%
(15.2)%

taxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

$ (6,799)

$

4,152

N/A%

29

Drilling and completion fluids revenue and direct operating costs increased in 2008 due to increased sales
volume both on land and offshore in the Gulf of Mexico. Goodwill impairment was recognized in the drilling and
completion fluids reporting unit in 2008 as a result of our annual impairment testing which indicated that the fair
value of goodwill in that reporting unit was zero. No impairment of goodwill was recognized in 2007 as the annual
impairment testing did not indicate that an impairment existed at that time. In 2008, income tax expense was
recognized despite a pre-tax loss in the drilling and completion fluids business due to the fact that the goodwill
impairment recorded in that year was not deductible for tax purposes.

Income Taxes

Income (loss) from continuing operations before income tax . . .
Income tax expense (benefit) . . . . . . . . . . . . . . . . . . . . . . . . . . .
Effective tax rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

$(51,555)
(17,595)
34.1%

The effective tax rate is a result of a Federal rate of 35.0% adjusted as follows:

2009

Year Ended December 31,
2008
(Dollars in thousands)
$547,358
193,490

$663,837
229,350

2007

35.3%

34.5%

2009

2008

2007

Statutory tax rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
State income taxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Permanent differences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other, net . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

35.0% 35.0% 35.0%
1.7
4.7
(1.2)
(5.7)
(0.2)
0.1

1.4
(1.6)
(0.3)

Effective tax rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

34.1% 35.3% 34.5%

The permanent differences indicated above are largely attributable to our Domestic Production Activities
deduction. The Domestic Production Activities Deduction was enacted as part of the American Jobs Creation Act of
2004 (as revised by the Emergency Economic Stabilization Act of 2008, the “Act”) and is effective for taxable years
after December 31, 2004. The Act allows a deduction of 6% on the lesser of qualified production activities income
or taxable income.

We record deferred Federal income taxes based primarily on the temporary differences between the book and
tax bases of our assets. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to
taxable income in the year in which those temporary differences are expected to be settled. As a result of fully
recognizing the benefit of our deferred income taxes, we incur deferred income tax expense as these benefits are
utilized. We recognized deferred tax expense of approximately $101 million in 2009, $65.4 million in 2008 and
$38.3 million in 2007.

Volatility of Oil and Natural Gas Prices and its Impact on Operations and Financial Condition

Our revenue, profitability, financial condition and rate of growth are substantially dependent upon prevailing
prices for natural gas and, to a lesser extent, oil. For many years, oil and natural gas prices and markets have been
extremely volatile. Prices are affected by market supply and demand factors as well as international military,
political and economic conditions, and the ability of OPEC to set and maintain production and price targets. All of
these factors are beyond our control. During 2008, the monthly average market price of natural gas (monthly
average Henry Hub price as reported by the Energy Information Administration) peaked in June at $13.06 per Mcf
before rapidly declining to an average of $5.99 per Mcf in December. In 2009, the monthly average market price of
natural gas declined further to a low of $3.06 per Mcf in September. This decline in the market price of natural gas
resulted in our customers significantly reducing their drilling activities beginning in the fourth quarter of 2008 and
drilling activities remained low throughout 2009. This reduction in demand combined with the reactivation and
construction of new land drilling rigs in the United States during the last several years has resulted in excess
capacity compared to demand. As a result of these factors, our average number of rigs operating has declined
significantly. We expect oil and natural gas prices to continue to be volatile and to affect our financial condition,

30

operations and ability to access sources of capital. Low market prices for natural gas would likely result in demand
for our drilling rigs remaining low and adversely affect our operating results, financial condition and cash flows.

The North American land drilling industry has experienced downturns in demand during the last decade.
During these periods, there have been substantially more drilling rigs available than necessary to meet demand. As a
result, drilling contractors have had difficulty sustaining profit margins and, at times, have incurred losses during
the downturn periods.

Impact of Inflation

Inflation has not had a significant impact on our operations during the three years in the period ended
December 31, 2009. We believe that inflation will not have a significant near-term impact on our financial position.

Recently Issued Accounting Standards

In June 2008, the FASB issued a new accounting standard which clarifies that share-based payment awards that
entitle their holders to receive non-forfeitable dividends before vesting should be considered participating securities
and, as such, should be included in the calculation of basic earnings-per-share using the two-class method. Certain
of our share-based payment awards entitle the holders to receive non-forfeitable dividends. This standard is
effective for financial statements issued for fiscal years beginning after December 15, 2008, as well as interim
periods within those years and became effective for us on January 1, 2009. The impact of the adoption of this
standard is discussed in Note 1 of our Consolidated Financial Statements.

In December 2008, the SEC issued a Final Rule, Modernization of Oil and Gas Reporting (“Final Rule”). The
Final Rule revises certain oil and gas reporting disclosures in Regulation S-K and Regulation S-X under the
Securities Act, and the Exchange Act, as well as Industry Guide 2. The amendments are designed to modernize and
update oil and gas disclosure requirements to align them with current practices and changes in technology. The
disclosure requirements are effective for registration statements filed on or after January 1, 2010 and for annual
financial statements filed on or after December 31, 2009. We applied the provisions of the Final Rule in connection
with our December 31, 2009 oil and natural gas reserve estimation process. The application of the Final Rule did not
have a material impact on us.

In April 2009, the FASB issued a staff position to provide additional guidance for determining whether a
market for a financial asset is not active and a transaction is not distressed for fair value measurements under
generally accepted accounting principles. The provisions of this staff position are effective for financial statements
issued for interim and annual periods ending after June 15, 2009 and became effective for us in the quarter ended
June 30, 2009. The adoption of this staff position did not have a material impact on us.

In April 2009, the FASB issued a staff position which increases the frequency of fair value disclosures for
financial instruments from annual only to quarterly reporting periods. The provisions of this staff position are
effective for financial statements issued for interim and annual periods ending after June 15, 2009 and became
effective for us in the quarter ended June 30, 2009. The adoption of this staff position did not have a material impact
on us.

In June 2009, the FASB issued a new accounting standard that amends the accounting and disclosure
requirements for the consolidation of variable interest entities. This new standard removes the previously existing
exception from applying consolidation guidance to qualifying special-purpose entities and requires ongoing
reassessments of whether an enterprise is the primary beneficiary of a variable interest entity. Before this new
standard, generally accepted accounting principles required reconsideration of whether an enterprise is the primary
beneficiary of a variable interest entity only when specific events occurred. This new standard is effective as of the
beginning of each reporting entity’s first annual reporting period that begins after November 15, 2009, for interim
periods within that first annual reporting period, and for interim and annual reporting periods thereafter. This new
standard became effective for us on January 1, 2010. The adoption of this standard did not impact our consolidated
financial statements.

In June 2009, the FASB issued the FASB Accounting Standards Codification (“Codification”). Effective for
financial statements issued for interim and annual periods ending after September 15, 2009, the Codification

31

became the source of authoritative U.S. generally accepted accounting principles. The FASB will no longer issue
new standards in the form of Statements, FASB Staff Positions or EITF Abstracts. Instead, it will issue Accounting
Standards Updates to update the Codification. The adoption of the Codification did not impact our consolidated
financial statements.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk

We currently have exposure to interest rate market risk associated with any borrowings that we have under our
revolving credit facility. The revolving credit facility calls for periodic interest payments at a floating rate ranging
from LIBOR plus 3.00% to 4.00% or at the prime rate. The applicable rate above LIBOR is based upon our debt to
capitalization ratio. As of December 31, 2009, we had no borrowings outstanding under our revolving credit facility.

We conduct a portion of our business in Canadian dollars through our Canadian land-based drilling operations.
The exchange rate between Canadian dollars and U.S. dollars has fluctuated during the last several years. If the
value of the Canadian dollar against the U.S. dollar weakens, revenues and earnings of our Canadian operations will
be reduced and the value of our Canadian net assets will decline when they are translated to U.S. dollars.

The carrying values of cash and cash equivalents, trade receivables and accounts payable approximate fair

value due to the short-term maturity of these items.

Item 8. Financial Statements and Supplementary Data.

Financial Statements are filed as a part of this Report at the end of Part IV hereof beginning at page F-1, Index

to Consolidated Financial Statements, and are incorporated herein by this reference.

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure.

None.

Item 9A. Controls and Procedures.

Disclosure Controls and Procedures:

Under the supervision and with the participation of our management, including our Chief Executive Officer
(CEO) and Chief Financial Officer (CFO), we conducted an evaluation of the effectiveness of our disclosure
controls and procedures, as such term is defined in Rules 13a-15(e) and 15d-15(e) promulgated under the Exchange
Act, as of the end of the period covered by this Report. Based on this evaluation, our CEO and CFO concluded that,
as of December 31, 2009, our disclosure controls and procedures were effective to ensure that information required
to be disclosed by us in reports that we file or submit under the Exchange Act is recorded, processed, summarized
and reported within the time periods specified in SEC rules and forms and is accumulated and reported to our
management, including our CEO and CFO, as appropriate to allow timely decisions regarding required disclosure.

Management’s Report on Internal Control over Financial Reporting:

Our management is responsible for establishing and maintaining adequate internal control over financial
reporting, as defined in Exchange Act Rule 13a-15(f). Under the supervision and with the participation of our
management, including our CEO and CFO, we carried out an evaluation of the effectiveness of our internal control
over financial reporting as of December 31, 2009, based on the Internal Control-Integrated Framework issued by
the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, our man-
agement has concluded that our internal control over financial reporting was effective as of December 31, 2009.

The effectiveness of our internal control over financial reporting as of December 31, 2009 has been audited by
PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report which
appears on page F-2 of this Report and is incorporated by reference into Item 8 of this Report.

32

Changes in Internal Control over Financial Reporting:

There have been no changes in our internal control over financial reporting during the most recently completed
fiscal quarter that have materially affected, or are reasonably likely to materially affect, our internal control over
financial reporting.

Item 9B. Other Information

None.

33

PART III

The information required by Part III is omitted from this Report because we expect to file a definitive proxy
statement (the “Proxy Statement”) pursuant to Regulation 14A of the Securities Exchange Act of 1934 no later than
120 days after the end of the fiscal year covered by this Report and certain information included therein is
incorporated herein by reference.

Item 10. Directors, Executive Officers and Corporate Governance.

The information required by this Item is incorporated herein by reference to the Proxy Statement.

We have adopted a Code of Business Conduct and Ethics for Senior Financial Executives, which covers,
among others, our principal executive officer, principal financial officer and principal accounting officer. The text of
this code is located on our website under “Governance.” Our Internet address is www.patenergy.com. We intend to
disclose any amendments to or waivers from this code on our website.

Item 11. Executive Compensation.

The information required by this Item is incorporated herein by reference to the Proxy Statement.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder

Matters.

The information required by this Item is incorporated herein by reference to the Proxy Statement.

Item 13. Certain Relationships and Related Transactions, and Director Independence.

The information required by this Item is incorporated herein by reference to the Proxy Statement.

Item 14. Principal Accountant Fees and Services.

The information required by this Item is incorporated herein by reference to the Proxy Statement.

34

Item 15. Exhibits and Financial Statement Schedule.

(a)(1) Financial Statements

PART IV

See Index to Consolidated Financial Statements on page F-1 of this Report.

(a)(2) Financial Statement Schedule

Schedule II — Valuation and qualifying accounts is filed herewith on page S-1.

All other financial statement schedules have been omitted because they are not applicable or the information

required therein is included elsewhere in the financial statements or notes thereto.

(a)(3) Exhibits

The following exhibits are filed herewith or incorporated by reference herein.

3.1

3.2

3.3

4.1

4.2

4.3
4.4

10.1
10.2

10.3

10.4

10.5

10.6

10.7

Restated Certificate of Incorporation, as amended (filed August 9, 2004 as Exhibit 3.1 to the Company’s
Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by
reference).
Amendment to Restated Certificate of Incorporation, as amended (filed August 9, 2004 as Exhibit 3.2 to
the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and
incorporated herein by reference).
Second Amended and Restated Bylaws (filed August 6, 2007 as Exhibit 3.3 to the Company’s Quarterly
Report on Form 10-Q for the quarterly period ended June 30, 2007 and incorporated herein by reference).
Rights Agreement dated January 2, 1997, between Patterson Energy, Inc. and Continental Stock
Transfer & Trust Company (filed January 14, 1997 as Exhibit 2 to the Company’s Registration
Statement on Form 8-A and incorporated herein by reference).
Amendment to Rights Agreement dated as of October 23, 2001 (filed October 31, 2001 as Exhibit 3.4 to
the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2001 and
incorporated herein by reference).
Restated Certificate of Incorporation, as amended (See Exhibits 3.1 and 3.2).
Registration Rights Agreement with Bear, Stearns and Co. Inc., dated March 25, 1994, as assigned by
REMY Capital Partners III, L.P. (filed March 19, 2002 as Exhibit 4.3 to the Company’s Annual Report on
Form 10-K for the fiscal year ended December 31, 2001 and incorporated herein by reference).
For additional material contracts, see Exhibits 4.1, 4.2 and 4.4.
Amended and Restated Patterson-UTI Energy, Inc. 2001 Long-Term Incentive Plan (filed November 27,
2002 as Exhibit 4.4 to Post Effective Amendment No. 1 to the Company’s Registration Statement on
Form S-8 (File No. 333-60470) and incorporated herein by reference).*
Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan (filed July 28, 2003 as
Exhibit 4.7 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2003
and incorporated herein by reference).*
Amendment to the Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan
(filed August 9, 2004 as Exhibit 10.7 to the Company’s Quarterly Report on Form 10-Q for the quarterly
period ended June 30, 2004 and incorporated herein by reference).*
Amended and Restated Patterson-UTI Energy, Inc. 1996 Employee Stock Option Plan (filed July 25, 2001
as Exhibit 4.4 to Post-Effective Amendment No. 1 to the Company’s Registration Statement on Form S-8
(File No. 333-60466) and incorporated herein by reference).*
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, including Form of Executive Officer
Restricted Stock Award Agreement, Form of Executive Officer Stock Option Agreement, Form of
Non-Employee Director Restricted Stock Award Agreement and Form of Non-Employee Director Stock
Option Agreement (filed June 21, 2005 as Exhibit 10.1 to the Company’s Current Report on Form 8-K,
and incorporated herein by reference).*
First Amendment to the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (filed June 6, 2008 as
Exhibit 10.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference).

35

10.8

10.9

Second Amendment to the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (filed June 6, 2008
as Exhibit 10.2 to the Company’s Current Report on Form 8-K and incorporated herein by reference).
Form of Cash-Settled Performance Unit Award Agreement pursuant to the Patterson-UTI Energy, Inc.
2005 Long-Term Incentive Plan, as amended from time to time.*

10.10 Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and
between Patterson-UTI Energy, Inc. and Mark S. Siegel (filed on February 4, 2004 as Exhibit 10.2 to the
Company’s Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein
by reference).*

10.11 Employment Agreement, dated as of September 1, 2007 between Patterson-UTI Energy, Inc. and Cloyce
A. Talbott (filed on September 24, 2007 as Exhibit 10.1 to the Company’s Current Report on Form 8-K,
and incorporated herein by reference).*

10.12 Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and
between Patterson-UTI Energy, Inc. and Kenneth N. Berns (filed on February 4, 2004 as Exhibit 10.5 to
the Company’s Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated
herein by reference).*

10.13 Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and
between Patterson-UTI Energy, Inc. and John E. Vollmer III (filed on February 4, 2004 as Exhibit 10.7 to
the Company’s Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated
herein by reference).*

10.14 Form of Letter Agreement regarding termination, effective as of January 29, 2004, entered into by
Patterson-UTI Energy, Inc. with each of Mark S. Siegel, Kenneth N. Berns and John E. Vollmer III (filed
on February 25, 2005 as Exhibit 10.23 to the Company’s Annual Report on Form 10-K for the year ended
December 31, 2004 and incorporated herein by reference).*

10.15 Form of Indemnification Agreement entered into by Patterson-UTI Energy, Inc. with each of Mark S.
Siegel, Cloyce A. Talbott, Douglas J. Wall, Kenneth N. Berns, Curtis W. Huff, Terry H. Hunt, Kenneth R.
Peak, Charles O. Buckner, John E. Vollmer III, Seth D. Wexler and Gregory W. Pipkin (filed April 28,
2004 as Exhibit 10.11 to the Company’s Annual Report on Form 10-K, as amended, for the year ended
December 31, 2003 and incorporated herein by reference).*

10.16 Severance Agreement between Patterson-UTI Energy, Inc. and Douglas J. Wall, effective as of August 31,
2007 (filed September 4, 2007 as Exhibit 10.3 to the Company’s Current Report on Form 8-K and
incorporated herein by reference).*

10.17 Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of August 31, 2007, by and
between Patterson-UTI Energy, Inc. and Douglas J. Wall (filed September 4, 2007 as Exhibit 10.2 to the
Company’s Current Report on Form 8-K and incorporated herein by reference).*

10.18 Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of November 2, 2009, by and
between Patterson-UTI Energy, Inc. and Seth D. Wexler (filed November 2, 2009 as Exhibit 10.2 to the
Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2009 and
incorporated herein by reference).*

10.19 First Amendment to Change in Control Agreement Between Patterson-UTI Energy, Inc. and Mark S.
Siegel, entered into November 1, 2007 (filed November 5, 2007 as Exhibit 10.8 to the Company’s
Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2007 and incorporated
herein by reference).*

10.20 First Amendment to Change in Control Agreement Between Patterson-UTI Energy, Inc. and Douglas J.
Wall, entered into November 1, 2007 (filed November 5, 2007 as Exhibit 10.9 to the Company’s Quarterly
Report on Form 10-Q for the quarterly period ended September 30, 2007 and incorporated herein by
reference).*

10.21 First Amendment to Change in Control Agreement Between Patterson-UTI Energy, Inc. and John E.
Vollmer, III, entered into November 1, 2007 (filed November 5, 2007 as Exhibit 10.10 to the Company’s
Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2007 and incorporated
herein by reference).*

36

10.22 First Amendment to Change in Control Agreement Between Patterson-UTI Energy, Inc. and Kenneth N.
Berns, entered into November 1, 2007 (filed November 5, 2007 as Exhibit 10.11 to the Company’s
Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2007 and incorporated
herein by reference).*

10.23 Credit Agreement dated March 20, 2009, among Patterson-UTI Energy, Inc., as borrower, Wells Fargo
Bank, N.A., as administrative agent, letter of credit issuer, swing line lender and lender, each of Amegy
Bank, N.A., Comerica Bank, and HSBC Bank USA, N.A., as lender, Bank of America, N.A., as
syndication agent, letter of credit issuer and lender, and The Bank of Tokyo-Mitsubishi UFJ, Ltd. as
documentation agent and lender (filed March 25, 2009 as Exhibit 10.1 to the Company’s Current Report
on Form 8-K and incorporated herein by reference).

21.1
23.1
31.1

10.24 Commitment Increase and Joinder Agreement dated June 19, 2009, among the Company, as borrower,
Regions Bank as the new lender, Bank of America, N.A., as a letter of credit issuer and Wells Fargo Bank,
N.A., as administrative agent, letter of credit issuer, swing line lender and lender (filed August 4, 2009 as
Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q and incorporated herein by reference).
10.25 Letter Agreement dated February 6, 2006 between Patterson-UTI Energy, Inc. and John E. Vollmer III
(filed May 1, 2006 as Exhibit 10.25 to the Company’s Annual Report on Form 10-K, as amended, and
incorporated herein by reference).*
Subsidiaries of the Registrant.
Consent of Independent Registered Public Accounting Firm.
Certification of Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange
Act of 1934, as amended.
Certification of Chief Financial Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange
Act of 1934, as amended.
Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 USC Section 1350, as
adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
The following materials from Patterson-UTI Energy, Inc.’s Annual Report on Form 10-K for the year
ended December 31, 2009, formatted in XBRL (Extensible Business Reporting Language): (i) the
Consolidated Balance Sheets, (ii) the Consolidated Statements of Operations, (iii) the Consolidated
Statements of Changes in Stockholders’ Equity, (iv) the Consolidated Statements of Cash Flows, (v) Notes
to Consolidated Financial Statements, tagged as blocks of text, and (vi) Valuation and Qualifying
Accounts.

31.2

32.1

101

* Management Contract or Compensatory Plan identified as required by Item 15(a)(3) of Form 10-K.

37

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

Report of Independent Registered Public Accounting Firm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Consolidated Financial Statements:
Consolidated Balance Sheets as of December 31, 2009 and 2008 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Consolidated Statements of Operations for the years ended December 31, 2009, 2008 and 2007 . . . . . . .
Consolidated Statements of Changes In Stockholders’ Equity for the years ended December 31, 2009,

2008 and 2007 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Consolidated Statements of Cash Flows for the years ended December 31, 2009, 2008 and 2007 . . . . . .
Notes to Consolidated Financial Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Financial Statement Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Page

F-2

F-3
F-4

F-5
F-6
F-7
S-1

F-1

Report of Independent Registered Public Accounting Firm

To the Board of Directors and Shareholders

of Patterson-UTI Energy, Inc.:

In our opinion, the consolidated financial statements listed in the accompanying index present fairly, in all material
respects, the financial position of Patterson-UTI Energy, Inc. and its subsidiaries (the “Company”) at December 31,
2009 and 2008, and the results of their operations and their cash flows for each of the three years in the period ended
December 31, 2009 in conformity with accounting principles generally accepted in the United States of America. In
addition, in our opinion, the financial statement schedule listed in the index appearing under Item 15(a)(2) presents
fairly, in all material respects, the information set forth therein when read in conjunction with the related
consolidated financial statements. Also in our opinion, the Company maintained, in all material respects, effective
internal control over financial reporting as of December 31, 2009, based on criteria established in Internal
Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Com-
mission (COSO). The Company’s management is responsible for these financial statements and financial statement
schedule, for maintaining effective internal control over financial reporting and for its assessment of the effec-
tiveness of internal control over financial reporting, included in Management’s Report on Internal Control over
Financial Reporting appearing under Item 9A. Our responsibility is to express opinions on these financial
statements, on the financial statement schedule, and on the Company’s internal control over financial reporting
based on our integrated audits. We conducted our audits in accordance with the standards of the Public Company
Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain
reasonable assurance about whether the financial statements are free of material misstatement and whether effective
internal control over financial reporting was maintained in all material respects. Our audits of the financial
statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial
statements, assessing the accounting principles used and significant estimates made by management, and evaluating
the overall financial statement presentation. Our audit of internal control over financial reporting included obtaining
an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and
testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our
audits also included performing such other procedures as we considered necessary in the circumstances. We believe
that our audits provide a reasonable basis for our opinions.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance
regarding the reliability of financial reporting and the preparation of financial statements for external purposes in
accordance with generally accepted accounting principles. A company’s internal control over financial reporting
includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail,
accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable
assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance
with generally accepted accounting principles, and that receipts and expenditures of the company are being made
only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable
assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s
assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstate-
ments. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may
become inadequate because of changes in conditions, or that the degree of compliance with the policies or
procedures may deteriorate.

/s/ PricewaterhouseCoopers LLP

Houston, Texas
February 19, 2010

F-2

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

December 31,

2009

2008

(In thousands,
except share data)

Current assets:

ASSETS

Cash and cash equivalents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $
Accounts receivable, net of allowance for doubtful accounts of $10,911 and

49,877

$

81,223

$9,330 at December 31, 2009 and 2008, respectively . . . . . . . . . . . . . . . . . . .
Federal and state income taxes receivable . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inventory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Deferred tax assets, net . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assets held for sale. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total current assets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Property and equipment, net . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Goodwill . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Deposits on equipment purchases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

164,498
118,869
6,941
32,877
42,424
41,782
457,268
2,110,402
86,234
914
7,334
Total assets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $2,662,152

LIABILITIES AND STOCKHOLDERS’ EQUITY

Current liabilities:

Accounts payable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $
Accrued expenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total current liabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Borrowings under revolving credit facility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Deferred tax liabilities, net . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total liabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Commitments and contingencies (see Note 9) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stockholders’ equity:

83,700
109,608
193,308
—
381,656
5,488
580,452
—

414,531
10,175
41,999
35,928
—
57,518
641,374
1,937,112
86,234
43,944
4,153
$2,712,817

$ 169,958
132,655
302,613
—
277,717
5,545
585,875
—

Preferred stock, par value $.01; authorized 1,000,000 shares, no shares issued . .
Common stock, par value $.01; authorized 300,000,000 shares with 180,828,773

and 180,192,093 issued and 153,610,785 and 153,094,803 outstanding at
December 31, 2009 and 2008, respectively. . . . . . . . . . . . . . . . . . . . . . . . . . .
Additional paid-in capital . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Retained earnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accumulated other comprehensive income. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Treasury stock, at cost, 27,217,988 shares and 27,097,290 shares at

—

—

1,808
781,635
1,901,853
14,996

1,801
765,512
1,970,824
5,774

(618,592)
December 31, 2009 and 2008, respectively. . . . . . . . . . . . . . . . . . . . . . . . . . .
Total stockholders’ equity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2,081,700
Total liabilities and stockholders’ equity . . . . . . . . . . . . . . . . . . . . . . . . . . . $2,662,152

(616,969)
2,126,942
$2,712,817

The accompanying notes are an integral part of these consolidated financial statements.

F-3

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS

Year Ended December 31,
2009
2007
2008
(In thousands, except per share data)

Operating revenues:

Contract drilling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pressure pumping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil and natural gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total operating revenues . . . . . . . . . . . . . . . . . . . . . . . . . . . .

$ 599,287
161,441
21,218
781,946

$1,804,026
217,494
42,360
2,063,880

$1,741,647
202,812
41,637
1,986,096

Operating costs and expenses:

Contract drilling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pressure pumping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil and natural gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Depreciation, depletion and impairment
. . . . . . . . . . . . . . . . . . . .
Selling, general and administrative . . . . . . . . . . . . . . . . . . . . . . . .
Embezzlement recoveries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Net loss (gain) on asset disposals . . . . . . . . . . . . . . . . . . . . . . . . .
Other operating expenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total operating costs and expenses. . . . . . . . . . . . . . . . . . . . .
Operating income (loss) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other income (expense):

Interest income. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interest expense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total other income (expense) . . . . . . . . . . . . . . . . . . . . . . . . .
Income (loss) before income taxes . . . . . . . . . . . . . . . . . . . . . . . . . .
Income tax expense (benefit):

Current
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Deferred. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total income tax expense (benefit). . . . . . . . . . . . . . . . . . . . .
Income (loss) from continuing operations . . . . . . . . . . . . . . . . . . . . .
Income (loss) from discontinued operations, net of income taxes . . . .
Net income (loss). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Basic income (loss) per common share:

Income (loss) from continuing operations . . . . . . . . . . . . . . . . .
Income (loss) from discontinued operations, net of income

taxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Net income (loss) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diluted income (loss) per common share:

Income (loss) from continuing operations . . . . . . . . . . . . . . . . .
Income (loss) from discontinued operations, net of income

taxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Net income (loss) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Weighted average number of common shares outstanding:

Basic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diluted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cash dividends per common share . . . . . . . . . . . . . . . . . . . . . . . . . .

357,742
111,414
7,341
289,847
56,621
—
3,385
3,810
830,160
(48,214)

381
(4,148)
426
(3,341)
(51,555)

1,038,327
132,570
12,793
275,990
58,080
—
(4,163)
4,350
1,517,947
545,933

1,553
(630)
502
1,425
547,358

963,150
105,273
10,864
246,346
54,665
(43,955)
(16,432)
2,875
1,322,786
663,310

2,351
(2,187)
363
527
663,837

(119,038)
101,443
(17,595)
(33,960)
(4,330)
$ (38,290)

128,098
65,392
193,490
353,868
(6,799)
$ 347,069

191,028
38,322
229,350
434,487
4,152
$ 438,639

$

$

$

$

$

(0.22)

(0.03)
(0.25)

(0.22)

(0.03)
(0.25)

152,069
152,069
0.20

$

$

$

$

$

2.29

(0.04)
2.25

2.27

(0.04)
2.23

153,379
154,358
0.60

$

$

$

$

$

2.78

0.03
2.81

2.75

0.03
2.78

154,755
156,612
0.44

The accompanying notes are an integral part of these consolidated financial statements.

F-4

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY

Common Stock

Number of
Shares

Amount

Additional
Paid-in
Capital

Accumulated
Other
Comprehensive
Income

Retained
Earnings
(In thousands)

Treasury
Stock

Total

176,656

$1,766

$681,069

$1,346,542

$ 8,390

$(475,301) $1,562,466

—

—

—

601
(101)
230
—

—
—
—

—

—

—

6
(1)
2
—

—
—
—

—

—

—

(6)
1
2,048
19,364

1,105
—
—

438,639

—

—

438,639

—

438,639

11,817

11,817

—
—
—
—

—
(68,561)
—

—
—
—
—

—
—
—

—

—

—
—
—
—

11,817

450,456

—
—
2,050
19,364

—
—
(70,850)

1,105
(68,561)
(70,850)

177,386

1,773

703,581

1,716,620

20,207

(546,151)

1,896,030

—

—

—

577
(75)
2,304
—

—
—
—

—

—

—

6
(1)
23
—

—
—
—

—

—

—

(6)
1
25,525
20,131

16,280
—
—

347,069

—

—

347,069

—

347,069

(14,433)

(14,433)

—
—
—
—

—
(92,865)
—

—
—
—
—

—
—
—

—

—

—
—
—
—

—
—
(70,818)

(14,433)

332,636

—
—
25,548
20,131

16,280
(92,865)
(70,818)

180,192

1,801

765,512

1,970,824

5,774

(616,969)

2,126,942

—

—

—

604
6
(56)
83
—

—
—
—

—

—

—

6
—
—
1
—

—
—
—

—

—

—

(6)
—
—
568
18,565

(3,004)
—
—

(38,290)

—

—

(38,290)

—

(38,290)

9,222

9,222

—
—
—
—
—

—
(30,681)
—

—
—
—
—
—

—
—
—

—

—

—
—
—
—
—

—
—
(1,623)

9,222

(29,068)

—
—
—
569
18,565

(3,004)
(30,681)
(1,623)

Balance, December 31, 2006 . . . . . . .
Comprehensive income:

Net income . . . . . . . . . . . . . . . . .
Foreign currency translation
adjustment, (net of tax of
$6,755) . . . . . . . . . . . . . . . . . .

Total comprehensive income. . . . . . . .

Issuance of restricted stock . . . . . . . .
Forfeitures of restricted stock . . . . . . .
Exercise of stock options . . . . . . . . . .
Stock-based compensation . . . . . . . . .
Tax benefit related to stock-based

compensation . . . . . . . . . . . . . . . .
Payment of cash dividends . . . . . . . . .
Purchase of treasury stock . . . . . . . . .

Balance, December 31, 2007 . . . . . . .
Comprehensive income:

Net income . . . . . . . . . . . . . . . . .
Foreign currency translation
adjustment, (net of tax of
$8,368) . . . . . . . . . . . . . . . . . .

Total comprehensive income. . . . . . . .

Issuance of restricted stock . . . . . . . .
Forfeitures of restricted stock . . . . . . .
Exercise of stock options . . . . . . . . . .
Stock-based compensation . . . . . . . . .
Tax benefit related to stock-based

compensation . . . . . . . . . . . . . . . .
Payment of cash dividends . . . . . . . . .
Purchase of treasury stock . . . . . . . . .

Balance, December 31, 2008 . . . . . . .
Comprehensive income (loss):

Net loss . . . . . . . . . . . . . . . . . . .
Foreign currency translation
adjustment, (net of tax of
$5,347) . . . . . . . . . . . . . . . . . .

Total comprehensive loss . . . . . . . . . .

Issuance of restricted stock . . . . . . . .
Vesting of restricted stock units. . . . . .
Forfeitures of restricted stock . . . . . . .
Exercise of stock options . . . . . . . . . .
Stock-based compensation . . . . . . . . .
Tax expense related to stock-based

compensation . . . . . . . . . . . . . . . .
Payment of cash dividends . . . . . . . . .
Purchase of treasury stock . . . . . . . . .

Balance, December 31, 2009 . . . . . . .

180,829

$1,808

$781,635

$1,901,853

$ 14,996

$(618,592) $2,081,700

The accompanying notes are an integral part of these consolidated financial statements.

F-5

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

2009

Year Ended December 31,
2008
(In thousands)

2007

Cash flows from operating activities:

Net income (loss) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustments to reconcile net income (loss) to net cash provided by

$ (38,290)

$ 347,069

$ 438,639

operating activities:
Depreciation, depletion and impairment . . . . . . . . . . . . . . . . . . . .
Provision for bad debts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dry holes and abandonments . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Deferred income tax expense . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stock-based compensation expense . . . . . . . . . . . . . . . . . . . . . . . .
Net loss (gain) on asset disposals . . . . . . . . . . . . . . . . . . . . . . . . .
Tax expense related to stock-based compensation . . . . . . . . . . . . .
Changes in operating assets and liabilities:

Accounts receivable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Income taxes receivable/payable . . . . . . . . . . . . . . . . . . . . . . . .
Inventory and other assets . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accounts payable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accrued expenses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other liabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Net cash provided by operating activities of discontinued

289,847
3,810
129
101,443
18,214
3,385
(3,004)

213,813
(108,664)
14,178
(52,673)
(21,178)
(92)

operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Net cash provided by operating activities . . . . . . . . . . . . . . . . . . .

32,759
453,677

275,990
4,350
1,617
65,392
19,688
(4,163)
—

(30,777)
(11,258)
2,498
6,486
(4,474)
1,242

1,344
675,004

246,346
2,875
1,309
38,322
18,873
(16,432)
—

100,429
7,174
2,211
(37,412)
(5,640)
1,434

14,096
812,224

Cash flows from investing activities:

Acquisitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Purchases of property and equipment . . . . . . . . . . . . . . . . . . . . . . . .
Proceeds from disposal of assets . . . . . . . . . . . . . . . . . . . . . . . . . . .
Net cash used in investing activities of discontinued operations . . . . .
Net cash used in investing activities . . . . . . . . . . . . . . . . . . . . . . .

—
(452,646)
3,359
(54)
(449,341)

—
(445,426)
11,436
(3,286)
(437,276)

(29,000)
(604,604)
34,054
(2,912)
(602,462)

Cash flows from financing activities:

Purchases of treasury stock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dividends paid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tax benefit related to stock-based compensation . . . . . . . . . . . . . . . .
Proceeds from borrowings under revolving credit facility . . . . . . . . .
Repayment of borrowings under revolving credit facility . . . . . . . . .
Revolving credit facility issuance costs . . . . . . . . . . . . . . . . . . . . . .
Proceeds from exercise of stock options . . . . . . . . . . . . . . . . . . . . . .
Net cash used in financing activities . . . . . . . . . . . . . . . . . . . . . . .
Effect of foreign exchange rate changes on cash . . . . . . . . . . . . . .
Net increase (decrease) in cash and cash equivalents . . . . . . . . .
Cash and cash equivalents at beginning of year . . . . . . . . . . . . . . . . . .
Cash and cash equivalents at end of year . . . . . . . . . . . . . . . . . . . . . . .

(1,623)
(30,681)
—
—
—
(6,169)
569
(37,904)
2,222
(31,346)
81,223
$ 49,877

(70,818)
(92,865)
16,280
—
(50,000)
—
25,548
(171,855)
(2,084)
63,789
17,434
$ 81,223

(70,850)
(68,561)
1,105
142,500
(212,500)
—
2,050
(206,256)
543
4,049
13,385
$ 17,434

Supplemental disclosure of cash flow information:
Net cash (paid) received during the year for:

Interest expense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Income taxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

$ (1,804)
14,029

$

(323)
(126,331)

$

(1,808)
(176,281)

Non-cash investing and financing activities:

Net increase (decrease) in payables for purchases of property

and equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Net (increase) decrease in deposits on equipment purchases. . . .

$ (25,110)
43,029

$

(3,590)
(42,293)

$

597
23,095

The accompanying notes are an integral part of these consolidated financial statements.

F-6

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. Description of Business and Summary of Significant Accounting Policies

A description of the business and basis of presentation follows:

Description of business — Patterson-UTI Energy, Inc., through its wholly-owned subsidiaries (collectively
referred to herein as “Patterson-UTI” or the “Company”), is a leading provider of onshore contract drilling services
to major and independent oil and natural gas operators in Texas, New Mexico, Oklahoma, Arkansas, Louisiana,
Mississippi, Colorado, Utah, Wyoming, Montana, North Dakota, Pennsylvania, West Virginia and western Canada.
The Company provides pressure pumping services primarily in the Appalachian Basin. The Company also owns
and invests in oil and natural gas assets as a working interest owner primarily in Texas and New Mexico.

Basis of presentation — The consolidated financial statements include the accounts of Patterson-UTI and its
wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated. Except
for wholly-owned subsidiaries, the Company has no controlling financial interests in any entity which would
require consolidation.

The U.S. dollar is the functional currency for all of the Company’s operations except for its Canadian
operations, which use the Canadian dollar as its functional currency. The effects of exchange rate changes are
reflected in accumulated other comprehensive income, which is a separate component of stockholders’ equity.

A summary of the significant accounting policies follows:

Management estimates — The preparation of financial statements in conformity with accounting principles
generally accepted in the United States of America requires management to make estimates and assumptions that
affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of
the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual
results could differ from such estimates.

Revenue recognition — Revenues are recognized when services are performed, except for revenues earned
under turnkey contract drilling arrangements which are recognized using the completed contract method of
accounting. The Company follows the percentage-of-completion method of accounting for footage contract drilling
arrangements. Under the percentage-of-completion method, management estimates are relied upon in the deter-
mination of the total estimated expenses to be incurred drilling the well. Due to the nature of turnkey contract
drilling arrangements and risks therein, the Company follows the completed contract method of accounting for such
arrangements. Under this method, all drilling revenues and expenses related to a well in progress are deferred and
recognized in the period the well is completed. Provisions for losses on incomplete or in-process wells are made
when estimated total expenses are expected to exceed estimated total revenues. The Company recognizes
reimbursements received from third parties for out-of-pocket expenses incurred as revenues and accounts for
these out-of-pocket expenses as direct costs. Except for two wells drilled under footage contracts in 2009, all of the
wells the Company drilled during the years ended December 31, 2009, 2008 and 2007 were under daywork
contracts.

Accounts receivable — Trade accounts receivable are recorded at the invoiced amount. The allowance for
doubtful accounts represents the Company’s estimate of the amount of probable credit losses existing in the
Company’s accounts receivable. The Company reviews the adequacy of its allowance for doubtful accounts at least
quarterly. Significant individual accounts receivable balances and balances which have been outstanding greater
than 90 days are reviewed individually for collectibility. Account balances, when determined to be uncollectible,
are charged against the allowance.

Inventories — Inventories at December 31, 2009 consist primarily of chemical products and sand to be used in
conjunction with the Company’s pressure pumping activities. Inventories at December 31, 2008 consisted primarily
of chemical products to be used in conjunction with the Company’s drilling and completion fluids activities. The
inventories are stated at the lower of cost or market, determined by the first-in, first-out method.

F-7

Property and equipment — Property and equipment is carried at cost less accumulated depreciation. Depre-
ciation is provided on the straight-line method over the estimated useful lives. The method of depreciation does not
change when equipment becomes idle. The estimated useful lives, in years, are shown below:

Useful Lives

Drilling rigs and other equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Buildings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-15
15-20
3-12

Long-lived assets, including property and equipment, are evaluated for impairment when certain triggering
events or changes in circumstances indicate that the carrying values may not be recoverable over their estimated
remaining useful life.

Oil and natural gas properties — Working interests in oil and natural gas properties are accounted for using
the successful efforts method of accounting. Under the successful efforts method of accounting, exploration costs
which result in the discovery of oil and natural gas reserves and all development costs are capitalized to the
appropriate well. Exploration costs which do not result in discovering oil and natural gas reserves are charged to
expense when such determination is made. Costs of exploratory wells are initially capitalized to wells in progress
until the outcome of the drilling is known. The Company reviews wells in progress quarterly to determine whether
sufficient progress is being made in assessing the reserves and the economic operating viability of the respective
projects. If no progress has been made in assessing the reserves and the economic operating viability of a project
after one year following the completion of drilling, the Company considers the costs of the well to be impaired and
recognizes the costs as expense. Geological and geophysical costs, including seismic costs, and costs to carry and
retain undeveloped properties are charged to expense when incurred. The capitalized costs of both developmental
and successful exploratory type wells, consisting of lease and well equipment, lease acquisition costs and intangible
development costs, are depreciated, depleted and amortized on the units-of-production method, based on engi-
neering estimates of proved oil and natural gas reserves of each respective field.

The Company reviews its proved oil and natural gas properties for impairment when a triggering event occurs
such as downward revisions in reserve estimates or decreases in oil and natural gas prices. Proved properties are
grouped by field and undiscounted cash flow estimates are prepared based on management’s expectation of future
pricing over the lives of the respective fields. These estimates are then reviewed by an independent petroleum
engineer. If the net book value of a field exceeds its undiscounted cash flow estimate, impairment expense is
measured and recognized as the difference between its net book value and discounted cash flow. Unproved oil and
natural gas properties are reviewed quarterly to assess potential impairment. The Company’s intent to drill, lease
expiration and abandonment of area are considered. Assessment of impairment is made on a lease-by-lease basis. If
an unproved property is determined to be impaired, costs related to that property are expensed.

Goodwill — Goodwill is considered to have an indefinite useful economic life and is not amortized. The
Company assesses impairment of its goodwill at least annually or on an interim basis if triggering events or
circumstances indicate that the fair value of the asset may have decreased below its carrying value. As discussed in
Note 5, the Company determined that goodwill in its drilling and completion fluids reporting unit was impaired in
connection with its annual impairment testing performed as of December 31, 2008. As discussed in Note 2, the
Company exited the drilling and completion fluids business in January 2010, and this impairment charge is included
in the results of discontinued operations in the consolidated statements of operations for the year ended Decem-
ber 31, 2008.

Maintenance and repairs — Maintenance and repairs are charged to expense when incurred. Renewals and

betterments which extend the life or improve existing property and equipment are capitalized.

Disposals — Upon disposition of property and equipment, the cost and related accumulated depreciation are

removed and any resulting gain or loss is reflected in the consolidated statement of operations.

Net income (loss) per common share — The Company provides a dual presentation of its net income (loss) per
common share in its consolidated statements of operations: Basic net income (loss) per common share (“Basic
EPS”) and diluted net income (loss) per common share (“Diluted EPS”). The Company adopted a new accounting
standard on January 1, 2009, which clarified that share-based payment awards that entitle their holders to receive

F-8

non-forfeitable dividends before vesting should be considered participating securities and, as such, should be
included in the calculation of earnings-per-share using the two-class method. All earnings-per-share data presented
for the years ended December 31, 2008 and 2007 have been adjusted retrospectively to conform with this
accounting standard. The impact of this retrospective application to the year ended December 31, 2008 was to
reduce Basic and Diluted EPS by $0.01. The impact of this retrospective application to the year ended December 31,
2007 was to reduce Basic EPS by $0.02 and to reduce Diluted EPS by $0.01.

Basic EPS excludes dilution and is computed by first allocating earnings between common stockholders and
holders of non-vested shares of restricted stock. Basic EPS is then determined by dividing the earnings attributable
to common stockholders by the weighted average number of common shares outstanding during the period,
excluding non-vested shares of restricted stock.

Diluted EPS is based on the weighted average number of common shares outstanding plus the dilutive effect of
potential common shares, including stock options, non-vested shares of restricted stock and restricted stock units.
The dilutive effect of stock options and restricted stock units is determined using the treasury stock method. The
dilutive effect of non-vested shares of restricted stock is based on the more dilutive of the treasury stock method or
the two-class method, assuming a reallocation of undistributed earnings to common stockholders after considering
the dilutive effect of potential common shares other than non-vested shares of restricted stock.

The following table presents information necessary to calculate income (loss) from continuing operations per
share, income(loss) from discontinued operations per share and net income (loss) per share for the years ended
December 31, 2009, 2008 and 2007 as well as potentially dilutive securities excluded from the weighted average
number of diluted common shares outstanding, as their inclusion would have been anti-dilutive (in thousands,
except per share amounts):

2009

2008

2007

BASIC EPS:
Income (loss) from continuing operations . . . . . . . . . . . . . . . . . $ (33,960)

$353,868

$434,487

Adjust for (income) loss attributed to holders of non-vested

restricted stock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

313

(3,279)

(3,886)

Income (loss) from continuing operations attributed to common

stockholders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ (33,647)

$350,589

$430,601

Income (loss) from discontinued operations, net . . . . . . . . . . . . $ (4,330)

$ (6,799)

$

4,152

Adjust for (income) loss attributed to holders of non-vested

restricted stock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

38

64

(37)

Income (loss) from discontinued operations attributed to

common stockholders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ (4,292)

$ (6,735)

$

4,115

Weighted average number of common shares outstanding,

excluding non-vested shares of restricted stock . . . . . . . . . . .

152,069

153,379

154,755

Basic income (loss) from continuing operations per common

share . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $

(0.22)

$

2.29

$

2.78

Basic income (loss) from discontinued operations per common

share . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(0.03)

(0.04)

Basic net income (loss) per common share . . . . . . . . . . . . . . . . $

(0.25)

$

2.25

$

0.03

2.81

F-9

2009

2008

2007

DILUTED EPS:
Income (loss) from continuing operations attributed to common

stockholders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ (33,647)
Add incremental earnings related to potential common

$350,589

$430,601

shares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

—

15

39

Adjusted income (loss) from continuing operations attributed to

common stockholders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ (33,647)

$350,604

$430,640

Weighted average number of common shares outstanding,

excluding non-vested shares of restricted stock . . . . . . . . . . .
Add dilutive effect of potential common shares . . . . . . . . . . .

152,069
—

153,379
979

154,755
1,857

Weighted average number of diluted common shares

outstanding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

152,069

154,358

156,612

Diluted income (loss) from continuing operations per common

share . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $

(0.22)

$

2.27

$

2.75

Diluted income (loss) from discontinued operations per

common share . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(0.03)

(0.04)

Diluted net income (loss) per common share . . . . . . . . . . . . . . . $

(0.25)

$

2.23

$

0.03

2.78

Potentially dilutive securities excluded as anti-dilutive . . . . . . . .

8,090

2,455

2,460

Income taxes — The asset and liability method is used in accounting for income taxes. Under this method, deferred
tax assets and liabilities are recognized for operating loss and tax credit carryforwards and for the future tax consequences
attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their
respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable
income in the year in which those temporary differences are expected to be recovered or settled. The effect on deferred
tax assets and liabilities of a change in tax rates is recognized in the results of operations in the period that includes the
enactment date. If applicable, a valuation allowance is recorded to reduce the carrying amounts of deferred tax assets
unless it is more likely than not that such assets will be realized.

The Company adopted a new accounting standard on January 1, 2007 which clarified the accounting for
uncertainty in income taxes recognized in an enterprise’s financial statements and prescribed a recognition
threshold and measurement attribute for the financial statement recognition and measurement of a tax position
taken or expected to be taken in a tax return. As a result of the adoption of this standard in 2007, the Company
reduced a reserve for an uncertain tax position related to a prior business combination that had originally been
recorded as goodwill in its contract drilling segment. The impact of this adjustment was to reduce goodwill in the
contract drilling segment by approximately $2.9 million upon adoption of the new standard. The impact of
adjustments to reserves with respect to other uncertain tax positions was not material. The Company’s policy is to
account for interest and penalties with respect to income taxes as operating expenses.

Stock based compensation — The Company recognizes the cost of share-based payments under the fair-value-
based method. Under this method, compensation cost related to share-based payments is measured based on the
estimated fair value of the awards at the date of grant, net of estimated forfeitures. This expense is recognized over
the expected life of the awards (See Note 11).

Statement of cash flows — For purposes of reporting cash flows, cash and cash equivalents include cash on

deposit and money market funds.

Subsequent Events — The Company has performed an evaluation of subsequent events through February 19,

2010 at the time of issuance of the consolidated financial statements.

Recently Issued Accounting Standards — In June 2008, the FASB issued an accounting standard which
clarifies that share-based payment awards that entitle their holders to receive non-forfeitable dividends before

F-10

vesting should be considered participating securities and, as such, should be included in the calculation of basic
earnings-per-share using the two-class method. Certain of the Company’s share-based payment awards entitle the
holders to receive non-forfeitable dividends. This standard is effective for financial statements issued for fiscal
years beginning after December 15, 2008, as well as interim periods within those years, and became effective for the
Company on January 1, 2009. The impact of the adoption of this standard is discussed in this Note 1.

In December 2008, the SEC issued a Final Rule, Modernization of Oil and Gas Reporting (“Final Rule”). The
Final Rule revises certain oil and gas reporting disclosures in Regulation S-K and Regulation S-X under the
Securities Act, and the Exchange Act, as well as Industry Guide 2. The amendments are designed to modernize and
update oil and gas disclosure requirements to align them with current practices and changes in technology. The
disclosure requirements are effective for registration statements filed on or after January 1, 2010 and for annual
financial statements filed on or after December 31, 2009. The Company applied the provisions of the Final Rule in
connection with its December 31, 2009 oil and natural gas reserve estimation process. The application of the Final
Rule did not have a material impact on the Company.

In April 2009, the FASB issued a staff position to provide additional guidance for determining whether a
market for a financial asset is not active and a transaction is not distressed for fair value measurements under
generally accepted accounting principles. The provisions of this staff position are effective for financial statements
issued for interim and annual periods ending after June 15, 2009 and became effective for the Company in the
quarter ended June 30, 2009. The adoption of this staff position did not have a material impact on the Company.

In June 2009, the FASB issued a new accounting standard that amends the accounting and disclosure
requirements for the consolidation of variable interest entities. This new standard removes the previously existing
exception from applying consolidation guidance to qualifying special-purpose entities and requires ongoing
reassessments of whether an enterprise is the primary beneficiary of a variable interest entity. Before this new
standard, generally accepted accounting principles required reconsideration of whether an enterprise is the primary
beneficiary of a variable interest entity only when specific events occurred. This new standard is effective as of the
beginning of each reporting entity’s first annual reporting period that begins after November 15, 2009, for interim
periods within that first annual reporting period, and for interim and annual reporting periods thereafter. This new
standard became effective for the Company on January 1, 2010. The adoption of this standard did not impact the
Company’s consolidated financial statements.

In June 2009, the FASB issued the FASB Accounting Standards Codification (“Codification”). Effective for
financial statements issued for interim and annual periods ending after September 15, 2009, the Codification
became the source of authoritative U.S. generally accepted accounting principles. The FASB will no longer issue
new standards in the form of Statements, FASB Staff Positions or EITF Abstracts. Instead, it will issue Accounting
Standards Updates to update the Codification. The adoption of the Codification did not impact the Company’s
consolidated financial statements.

Reclassifications — Certain reclassifications have been made to the 2008 and 2007 consolidated financial
statements in order for them to conform with the 2009 presentation. These reclassifications had no impact on the
Company’s financial position, results of operations or cash flows.

2. Discontinued Operations

On January 20, 2010, the Company exited the drilling and completion fluids services business, which had
previously been presented as one of the Company’s reportable operating segments. On that date, the Company’s
wholly owned subsidiary, Ambar Lone Star Fluids Services LLC, completed the sale of substantially all of its assets,
excluding billed accounts receivable. The sales price was approximately $44.3 million, subject to any post-closing
adjustments to reflect the actual assets transferred as of the closing date. Upon the Company’s exit from the drilling
and completion fluids services business, the Company classified its drilling and completion fluids operating
segment as a discontinued operation. Accordingly, the results of operations of this business have been reclassified
and presented as results of discontinued operations for all periods presented in these consolidated financial
statements. As of December 31, 2009, the assets to be disposed of are considered held for sale and are presented
separately under the caption “Assets held for sale” in the consolidated balance sheet. These assets are included in the
balance sheet at fair value less transaction costs. The fair value of the assets to be disposed of was estimated to be

F-11

approximately $44.3 million based on the expected sales price described above. The source of this estimate was
from a third party and it is considered a level 2 input in the fair value hierarchy of fair value accounting. Costs to sell
the disposal group were estimated to be $1.9 million. An impairment charge of $1.9 million was recognized to
reduce the carrying value of the disposal group to its estimated fair value less costs to sell.

Summarized operating results from discontinued operations for the years ended December 31, 2009, 2008 and

2007 are shown below (in thousands):

Drilling and completion fluids revenues . . . . . . . . . . . . . . . . . . . $79,786

$145,246

$128,098

Income (loss) before income taxes . . . . . . . . . . . . . . . . . . . . . . . $ (6,538)
2,208
Income tax benefit (expense) . . . . . . . . . . . . . . . . . . . . . . . . . . .

$ (4,410)
(2,389)

$

6,970
(2,818)

Income (loss) from discontinued operations . . . . . . . . . . . . . . . . $ (4,330)

$ (6,799)

$

4,152

2009

2008

2007

The loss before income taxes in 2008 includes $9.96 million in non-deductible charges resulting from the
impairment of goodwill. As a result, income tax expense was incurred for the year despite the fact that the
discontinued operation had a pre-tax book loss.

The components of assets held for sale at December 31, 2009 are shown below (in thousands):

Assets held for sale:

Inventory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unbilled accounts receivable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Prepaid expenses and other current assets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Property and equipment, net . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reserve to reduce disposal group to fair value less costs to sell . . . . . . . . . . . . . . . . . . .

$28,620
6,587
324
8,793
(1,900)

Total assets held for sale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

$42,424

3. Acquisitions

On October 9, 2007, the Company acquired three recently refurbished SCR electric land-based drilling rigs
and spare drilling equipment for $29.0 million. The transaction was accounted for as an acquisition of assets and the
purchase price was allocated among the assets acquired based on their estimated fair market values.

4. Property and Equipment

Property and equipment consisted of the following at December 31, 2009 and 2008 (in thousands):

2009

2008

Equipment
Oil and natural gas properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Buildings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Land . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 3,230,737
93,354
56,563
9,795

$ 2,897,431
89,809
61,529
10,196

Less accumulated depreciation and depletion . . . . . . . . . . . . . . . . . . . .

3,390,449
(1,280,047)

3,058,965
(1,121,853)

Property and equipment, net

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 2,110,402

$ 1,937,112

F-12

Depreciation, depletion and impairment — The following table summarizes depreciation, depletion and

impairment expense related to property and equipment for 2009, 2008 and 2007 (in millions):

2009

2008

2007

Depreciation and impairment expense . . . . . . . . . . . . . . . . . . . . . . . . . $280.6
9.2
Depletion expense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

$264.5
11.5

$232.9
13.4

Total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $289.8

$276.0

$246.3

The Company evaluates the recoverability of its long-lived assets whenever events or changes in circumstances
indicate that their carrying amounts may not be recoverable. In light of adverse market conditions affecting the
Company beginning in the fourth quarter of 2008 and continuing into 2009, including a substantial decrease in the
operating levels of certain of its business segments, a significant decline in oil and natural gas commodity prices,
and the results of the Company’s annual goodwill impairment test at December 31, 2008 (see Note 5), the Company
deemed it necessary to assess the recoverability of long-lived assets within its contract drilling and drilling and
completion fluids segments in 2008. Due to a continued decrease in the operating levels in its contract drilling
business segment through the first three quarters of 2009, the Company again deemed it necessary to assess the
recoverability of long-lived assets within that segment during 2009. With respect to the long-lived assets in the
Company’s oil and natural gas exploration and production segment, the Company assesses the recoverability of
long-lived assets at the end of each quarter due to revisions in its oil and natural gas reserve estimates and
expectations about future commodity prices. The Company concluded that its pressure pumping segment was not
subject to the negative events and trends, to the same degree as the contract drilling segment, and thus did not
require further assessment of recoverability.

The Company performs the first step of its impairment assessments by comparing the undiscounted cash flows
for each long-lived asset or asset group to its respective carrying value. Based on the results of these impairment
tests, the carrying amounts of long-lived assets in the contract drilling and oil and natural gas segments were
determined to be recoverable, except as described below.

The Company’s analysis indicated that the carrying amounts of certain oil and natural gas properties were not
recoverable at various testing dates in 2009, 2008 and 2007. The Company’s estimates of expected future net cash
flows from impaired properties are used in measuring the fair value of such properties. The Company recorded
impairment charges of $3.7 million, $4.4 million and $3.9 million in 2009, 2008 and 2007, respectively, related to
its oil and natural gas properties. The Company determined the fair value of the impaired assets using internally
developed unobservable inputs (level 3 inputs in the fair value hierarchy of fair value accounting).

During 2009 and 2008, in connection with its long term planning process, the Company evaluated its then-
current fleet of marketable drilling rigs and identified 23 and 22 rigs, respectively, that it determined would no
longer be marketed as rigs. Additionally, in 2009, the Company identified one rig which would be recommissioned
in a different configuration. The components comprising these rigs were evaluated, and those components with
continuing utility to the Company’s other marketed rigs were transferred to other rigs or to yards to be used as spare
equipment. The remaining components of these rigs were impaired and the associated net book value of
$10.5 million in 2009 and $10.4 million in 2008 was expensed in the Company’s consolidated statements of
operations as an impairment charge. The components that were impaired were estimated to have no fair value. The
Company determined the fair value of the impaired assets using internally developed unobservable inputs (level 3
inputs in the fair value hierarchy of fair value accounting).

F-13

5. Goodwill

Goodwill by operating segment as of December 31, 2009 and 2008 and changes for the years then ended are as

follows (in thousands):

Contract Drilling:
Balance as of January 1:
Goodwill . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accumulated impairment losses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Changes to goodwill . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Balance as of December 31:
Goodwill . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accumulated impairment losses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Drilling and Completion Fluids (Discontinued Operations):
Balance as of January 1:
Goodwill . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accumulated impairment losses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Impairment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Balance as of December 31:
Goodwill . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accumulated impairment losses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2009

2008

$86,234
—

86,234
—

$86,234
—

86,234
—

86,234
—

86,234

86,234
—

86,234

9,964
(9,964)

—
—

9,964
—

9,964
(9,964)

9,964
(9,964)

9,964
(9,964)

—

—

Total goodwill as of December 31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

$86,234

$86,234

Goodwill is evaluated at least annually to determine if the fair value of recorded goodwill has decreased below
its carrying value. For purposes of impairment testing, goodwill is evaluated at the reporting unit level. The
Company’s reporting units for impairment testing have been determined to be its operating segments. Goodwill as
of December 31, 2009 and 2008 is recorded in the Company’s contract drilling segment. Prior to 2008, goodwill was
also recorded in the Company’s drilling and completion fluids segment.

In connection with its annual goodwill impairment assessment performed as of December 31, 2008, the Company
performed an impairment test of goodwill recorded in its contract drilling and drilling and completion fluids reporting
units. In light of the adverse market conditions affecting the Company’s common stock price beginning in the fourth
quarter of 2008 and continuing into 2009, including a significant decrease in the number of its rigs operating and a
significant decline in oil and natural gas commodity prices, the Company utilized a discounted cash flow methodology to
estimate the fair values of its reporting units. In completing its first step of the analysis, the Company used a three-year
projection of discounted cash flows, plus a terminal value determined using the constant growth method to estimate the fair
value of its reporting units. In developing these fair value estimates, the Company applied key assumptions, including an
assumed discount rate of 13.99% for all reporting units, an assumed long-term growth rate of 3.50% for the contract
drilling reporting unit and an assumed long-term growth rate of 2.00% for the drilling and completion fluids reporting unit.

Based on the results of the first step of the impairment test in 2008, the Company concluded that no impairment
was indicated in its contract drilling reporting unit as the estimated fair value of that reporting unit exceeded its
carrying value. An impairment was indicated in the drilling and completion fluids reporting unit as the estimated
fair value of that reporting unit was less than its carrying value. In validating this conclusion, the Company
considered the results of its long-lived asset impairment tests and performed sensitivity analyses of the key
assumptions used in deriving the respective fair values of its reporting units. The Company then performed the
second step of the analysis of its drilling and completion fluids reporting unit, which included allocating the

F-14

estimated fair value to the identifiable tangible and intangible assets and liabilities of this reporting unit based on
their respective values. This allocation indicated that there was no residual value for goodwill, and accordingly the
Company recorded an impairment charge of $9.964 million in the year ended December 31, 2008. As discussed in
Note 2, the Company exited the drilling and completion fluids business on January 20, 2010, and the impairment
charge recorded in 2008 is included in the loss from discontinued operations in the Company’s statement of
operations for the year ended December 31, 2008.

The Company again performed its annual goodwill impairment assessment as of December 31, 2009 related to
the remaining $86.2 million in goodwill recorded in its contract drilling reporting unit. In completing its first step of
the analysis, the Company used a three-year projection of discounted cash flows, plus a terminal value determined
using the constant growth method to estimate the fair value of the reporting unit. In developing this fair value
estimate, the Company applied key assumptions, including an assumed discount rate of 15.42% and an assumed
long-term growth rate of 3.50%. Based on the results of the first step of the impairment test in 2009, the Company
concluded that no impairment was indicated in its contract drilling reporting unit as the estimated fair value of that
reporting unit exceeded its carrying value.

In the event that market conditions weaken, the Company may be required to record an impairment of goodwill

in its contract drilling reporting unit in the future, and such impairment could be material.

6. Accrued Expenses

Accrued expenses consisted of the following at December 31, 2009 and 2008 (in thousands):

2009

2008

Salaries, wages, payroll taxes and benefits . . . . . . . . . . . . . . . . . . . . . . . . . . $ 14,744
66,015
Workers’ compensation liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10,975
Sales, use and other taxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11,261
Insurance, other than workers’ compensation . . . . . . . . . . . . . . . . . . . . . . . .
6,613
Other . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

$ 30,334
70,439
12,105
14,209
5,658

$109,608

$132,655

7. Asset Retirement Obligation

The Company records a liability for the estimated costs to be incurred in connection with the abandonment of
oil and natural gas properties in the future. This liability is included in the caption “other liabilities” on the
consolidated balance sheet. The following table describes the changes to the Company’s asset retirement obli-
gations during 2009 and 2008 (in thousands):

2009

2008

Balance at beginning of year. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $3,047
157
Liabilities incurred . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(354)
Liabilities settled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
118
Accretion expense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(13)
Revision in estimated costs of plugging oil and natural gas wells . . . . . . . . . . . . .

$1,593
516
(424)
59
1,303

Asset retirement obligation at end of year . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $2,955

$3,047

8. Borrowings Under Revolving Credit Facility

In March 2009, the Company entered into an unsecured revolving credit facility with a maximum borrowing
capacity of $240 million, including a letter of credit sublimit of $150 million and a swing line sublimit of
$40 million. In addition, the aggregate borrowing and letter of credit capacity under the revolving credit facility
may, subject to the terms and conditions set forth therein including the receipt of additional commitments from
lenders, be increased up to a maximum amount not to exceed $450 million.

F-15

Interest is paid on the outstanding principal amount of revolving credit facility borrowings at a floating rate
based on, at the Company’s election, LIBOR or a base rate. The margin on LIBOR loans ranges from 3.00% to
4.00% and the margin on base rate loans ranges from 2.00% to 3.00%, based on the Company’s debt to
capitalization ratio. At December 31, 2009, the margin on LIBOR loans would have been 3.00% and the margin
on base rate loans would have been 2.00%. Any outstanding borrowings must be repaid at maturity on January 31,
2012 and letters of credit may remain in effect up to six months after such maturity date. This revolving credit
facility includes various fees, including a commitment fee on the actual daily unused commitment (the commitment
fee rate was 1.00% at December 31, 2009).

The Company incurred line of credit issuance costs of approximately $6.2 million during 2009 in connection
with the revolving credit facility. These costs are being amortized to interest expense over the contractual term of the
revolving credit facility.

There are customary representations, warranties, restrictions and covenants associated with the revolving
credit facility. Financial covenants provide for a maximum debt to capitalization ratio and a minimum interest
coverage ratio. As of December 31, 2009, the maximum debt to capitalization ratio was 35% and the minimum
interest coverage ratio was 3.00 to 1. The Company does not expect that the restrictions and covenants will impact
its ability to operate or react to opportunities that might arise.

As of December 31, 2009, the Company had no borrowings outstanding under the revolving credit facility. The
Company had $46.3 million in letters of credit outstanding at December 31, 2009 and, as a result, had available
borrowing capacity of approximately $194 million at that date. Each domestic subsidiary of the Company has
unconditionally guaranteed the existing and future obligations of the Company and each other guarantor under the
revolving credit facility and related loan documents, as well as obligations of the Company and its subsidiaries
under any interest rate swap contracts that may be entered into with lenders party to the revolving credit facility.

9. Commitments, Contingencies and Other Matters

Commitments — As of December 31, 2009, the Company maintained letters of credit in the aggregate amount
of $46.3 million for the benefit of various insurance companies as collateral for retrospective premiums and retained
losses which could become payable under the terms of the underlying insurance contracts. These letters of credit
expire annually at various times during the year and are typically renewed. As of December 31, 2009, no amounts
had been drawn under the letters of credit.

As of December 31, 2009, the Company had commitments to purchase approximately $186 million of major

equipment.

Contingencies — The Company’s contract services operations are subject to inherent risks, including blow-
outs, cratering, fire and explosions which could result in personal injury or death, suspended drilling operations,
damage to, or destruction of equipment, damage to producing formations and pollution or other environmental
hazards.

As a protection against these hazards, the Company maintains general liability insurance coverage of
$1.0 million per occurrence in excess of a $1.0 million self-insured retention for a total limit of $2.0 million
per occurrence, with $10.0 million of aggregate coverage and excess liability and umbrella coverages up to
$200 million per occurrence and in the aggregate. The Company maintains a $1.0 million per occurrence deductible
on its workers’ compensation, general liability and automobile liability insurance coverages. Accrued expenses
related to insurance claims are set forth in Note 6.

The Company believes it is adequately insured for bodily injury and property damage to others with respect to
its operations. However, such insurance may not be sufficient to protect the Company against liability for all
consequences of personal injury, well disasters, extensive fire damage, or damage to the environment. The
Company also carries insurance to cover physical damage to, or loss of, its rigs. However, it does not cover the full
replacement cost of the rigs and the Company does not carry insurance against loss of earnings resulting from such
damage. There can be no assurance that such insurance coverage will always be available on terms that are
satisfactory to the Company, if at all.

F-16

The Company is party to various legal proceedings arising in the normal course of its business. The Company
does not believe that the outcome of these proceedings, either individually or in the aggregate, will have a material
adverse effect on its financial condition, results of operations or cash flows.

Other Matters — The Company has Change in Control Agreements with its Chairman of the Board, Chief
Executive Officer, two Senior Vice Presidents and its General Counsel (the “Key Employees”). Each Change in
Control Agreement generally has an initial term with automatic twelve month renewals unless the Company notifies
the Key Employee at least ninety days before the end of such renewal period that the term will not be extended. If a
change in control of the Company occurs during the term of the agreement and the Key Employee’s employment is
terminated (i) by the Company other than for cause or other than automatically as a result of death, disability or
retirement, or (ii) by the Key Employee for good reason (as those terms are defined in the Change in Control
Agreements), then the Key Employee shall generally be entitled to, among other things:

(cid:129) a bonus payment equal to the greater of the highest bonus paid after the Change in Control Agreement was
entered into and the average of the two annual bonuses earned in the two fiscal years immediately preceding
a change in control (such bonus payment prorated for the portion of the fiscal year preceding the termination
date);

(cid:129) a payment equal to 2.5 times (in the case of the Chairman of the Board and Chief Executive Officer), 2 times
(in the case of the Senior Vice Presidents) or 1.5 times (in the case of the General Counsel) of the sum of
(i) the highest annual salary in effect for such Key Employee and (ii) the average of the three annual bonuses
earned by the Key Employee for the three fiscal years preceding the termination date; and

(cid:129) continued coverage under the Company’s welfare plans for up to three years (in the case of the Chairman of
the Board and Chief Executive Officer) or two years (in the case of the Senior Vice Presidents and General
Counsel).

Each Change in Control Agreement provides the Key Employee with a full gross-up payment for any excise
taxes imposed on payments and benefits received under the Change in Control Agreements or otherwise, including
other taxes that may be imposed as a result of the gross-up payment.

10. Stockholders’ Equity

Cash Dividends — The Company paid cash dividends during the years ended December 31, 2007, 2008 and

2009 as follows:

Per Share

Total
(in thousands)

2007:
Paid on March 30, 2007 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paid on June 29, 2007 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paid on September 28, 2007 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paid on December 28, 2007 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Total cash dividends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2008:
Paid on March 28, 2008 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paid on June 27, 2008 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paid on September 29, 2008 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paid on December 29, 2008 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Total cash dividends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

$0.08
0.12
0.12
0.12

$0.44

$0.12
0.16
0.16
0.16

$0.60

$12,527
18,860
18,690
18,484

$68,561

$18,493
25,011
24,803
24,558

$92,865

F-17

Per Share

Total
(in thousands)

2009:
Paid on March 31, 2009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paid on June 30, 2009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paid on September 30, 2009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paid on December 30, 2009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Total cash dividends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

$0.05
0.05
0.05
0.05

$0.20

$ 7,655
7,675
7,675
7,676

$30,681

On February 10, 2010, the Company’s Board of Directors approved a cash dividend on its common stock in the
amount of $0.05 per share to be paid on March 30, 2010 to holders of record as of March 15, 2010. The amount and
timing of all future dividend payments, if any, is subject to the discretion of the Board of Directors and will depend
upon business conditions, results of operations, financial condition, terms of the Company’s credit facilities and
other factors.

On August 1, 2007, the Company’s Board of Directors approved a stock buyback program authorizing
purchases of up to $250 million of the Company’s common stock in open market or privately negotiated
transactions. During the year ended December 31, 2007, the Company purchased 3,308,850 shares of its common
stock under the program at a cost of approximately $70.4 million. During the year ended December 31, 2008, the
Company purchased 3,502,047 shares of its common stock under the program at a cost of approximately
$66.3 million. During the year ended December 31, 2009, the Company purchased 5,715 shares of its common
stock under the program at a cost of approximately $79,000. As of December 31, 2009, the Company is authorized
to purchase approximately $113 million of the Company’s outstanding common stock under the program. Shares
purchased under the program are accounted for as treasury stock.

Additionally, the Company purchased 114,983, 152,235 and 20,269 shares of treasury stock from employees
during 2009, 2008 and 2007, respectively. These shares were purchased at fair market value upon the vesting of
restricted stock to provide the employees with the funds necessary to satisfy payroll tax withholding obligations.
The total purchase price for these shares was approximately $1.5 million, $4.5 million and $496,000 in 2009, 2008
and 2007, respectively. These purchases were made pursuant to the terms of the Patterson-UTI Energy, Inc. 2005
Long-Term Incentive Plan and not pursuant to the stock buyback program.

11. Stock-based Compensation

The Company uses share-based payments to compensate employees and non-employee directors. The
Company recognizes the cost of share-based payments under the fair-value-based method. Prior to 2009,
share-based awards consisted of equity instruments in the form of stock options, restricted stock or restricted
stock units, with all such awards subject to service conditions and, in certain cases, performance conditions.
Beginning in 2009, share-based awards also include cash-settled performance unit awards which are accounted for
as liability awards. The Company issues shares of common stock when vested stock options are exercised, when
restricted stock is granted and when restricted stock units vest.

The Company’s shareholders have approved the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan
(the “2005 Plan”), and the Board of Directors adopted a resolution that no future grants would be made under any of
the Company’s other previously existing plans. During 2008, the Company amended the 2005 Plan to, among other

F-18

things, increase the total number of shares authorized for grant from 6,250,000 to 10,250,000. The Company’s
share-based compensation plans at December 31, 2009 follow:

Plan Name

Shares
Authorized
for Grant

Awards
Outstanding

Shares
Available
for Grant

Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan,

as amended . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10,250,000

4,980,068

2,545,524

Patterson-UTI Energy, Inc. Amended and Restated 1997

Long-Term Incentive Plan, as amended (“1997 Plan”) . . .

— 2,860,634

Amended and Restated Patterson-UTI Energy, Inc. 2001

Long-Term Incentive Plan (“2001 Plan”) . . . . . . . . . . . . .

Amended and Restated Patterson-UTI Energy, Inc. 1996

Employee Stock Option Plan (“1996 Plan”) . . . . . . . . . . .

—

—

214,136

35,000

—

—

—

A summary of the 2005 Plan follows:

(cid:129) The Compensation Committee of the Board of Directors administers the plan.

(cid:129) All employees including officers and directors are eligible for awards.

(cid:129) The Compensation Committee determines the vesting schedule for awards. Awards typically vest over one

year for non-employee directors and 3 to 4 years for employees.

(cid:129) The Compensation Committee sets the term of awards and no option term can exceed 10 years.

(cid:129) All options granted under the plan are granted with an exercise price equal to or greater than the fair market

value of the Company’s common stock at the time the option is granted.

(cid:129) The plan provides for awards of incentive stock options, non-incentive stock options, tandem and free-
standing stock appreciation rights, restricted stock awards, other stock unit awards, performance share
awards, performance unit awards and dividend equivalents. As of December 31, 2009, only non-incentive
stock options, restricted stock awards, restricted stock units and performance unit awards had been granted
under the plan.

Options granted under the 1997 Plan typically vest over three or five years as dictated by the Compensation
Committee. These options have terms of no more than ten years. All options were granted with an exercise price
equal to the fair market value of the related common stock at the time of grant. Restricted stock awards granted
under the 1997 Plan typically vested over four years.

Options granted under the 2001 Plan typically vest over five years as dictated by the Compensation
Committee. These options have terms of no more than ten years. All options were granted with an exercise price
equal to the fair market value of the Company’s common stock at the time of grant.

Options granted under the 1996 Plan typically vest over two or five years as dictated by the Compensation
Committee. These options have terms of no more than ten years. All options were granted with an exercise price
equal to the fair market value of the Company’s common stock at the time of grant.

Stock Options — The Company estimates the grant date fair values of stock options using the Black-Scholes-
Merton valuation model (“Black-Scholes”). Volatility assumptions are based on the historic volatility of the
Company’s common stock over the most recent period equal to the expected term of the options as of the date the
options are granted. The expected term assumptions are based on the Company’s experience with respect to
employee stock option activity. Dividend yield assumptions are based on the expected dividends at the time the
options are granted. The risk-free interest rate assumptions are determined by reference to United States Treasury

F-19

yields. Weighted-average assumptions used to estimate grant date fair values for stock options granted in the years
ended December 31, 2009, 2008 and 2007 follow:

2009

2008

2007

Volatility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Expected term (in years) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dividend yield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Risk-free interest rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

49.90% 37.04% 36.37%
4.17
4.00
1.67% 2.27% 1.97%
1.67% 2.91% 4.55%

4.00

Stock option activity for the year ended December 31, 2009 follows:

Outstanding at beginning of year . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Granted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exercised . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Expired . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shares

5,933,572
1,037,500
(82,802)
(46,500)

Outstanding at end of year . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6,841,770

Exercisable at end of year . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5,258,103

Weighted-average
exercise price

$21.20
$13.12
$ 6.87
$18.76

$20.17

$21.18

Options outstanding at December 31, 2009 have an aggregate intrinsic value of approximately $4.7 million and
a weighted-average remaining contractual term of 6.0 years. Options exercisable at December 31, 2009 have an
aggregate intrinsic value of approximately $1.9 million and a weighted-average remaining contractual term of
5.1 years. Additional information with respect to options granted, vested and exercised during the years ended
December 31, 2009, 2008 and 2007 follows:

2009

2008

2007

Weighted-average grant-date fair value of stock options granted (per

share) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 4.71

$ 7.20

$ 7.09

Grant-date fair value of stock options vested during the year (in

thousands) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $6,973
Aggregate intrinsic value of stock options exercised (in thousands) . . . $ 510

$ 6,761
$45,240

$5,613
$3,186

As of December 31, 2009, options to purchase 1,583,667 shares were outstanding and not vested. All of these
non-vested options are expected to ultimately vest. Additional information as of December 31, 2009 with respect to
these non-vested options that are expected to vest follows:

Aggregate intrinsic value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $2.7 million
Weighted-average remaining contractual term . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.95 years
Weighted-average remaining expected term. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.03 years
Weighted-average remaining vesting period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.98 years
Unrecognized compensation cost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $7.1 million

Restricted Stock — For all restricted stock awards to date, shares of common stock were issued when the
awards were made. Non-vested shares are subject to forfeiture for failure to fulfill service conditions and, in certain
cases, performance conditions. Non-forfeitable dividends are paid on non-vested shares of restricted stock. For
restricted stock awards made prior to 2008, the Company uses the “graded-vesting” attribution method to recognize
periodic compensation cost over the vesting period. For restricted stock awards made in 2008 and thereafter, the
Company uses the straight-line method to recognize periodic compensation cost over the vesting period.

F-20

Restricted stock activity for the year ended December 31, 2009 follows:

Non-vested restricted stock outstanding at beginning of year . . . . . . . . . . . . 1,429,571
603,600
Granted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(745,715)
Vested . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(55,555)
Forfeited . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Non-vested restricted stock outstanding at end of year . . . . . . . . . . . . . . . . 1,231,901

Shares

Weighted-
average
Grant Date
Fair Value

$28.49
$13.75
$27.97
$26.65

$21.67

As of December 31, 2009, approximately 1,145,000 shares of non-vested restricted stock outstanding are
expected to vest. Additional information as of December 31, 2009 with respect to these unvested shares follows:

Aggregate intrinsic value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Weighted-average remaining vesting period. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unrecognized compensation cost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

$17.6 million
1.54 years
$13.9 million

Restricted Stock Units — For all restricted stock unit awards made to date, shares of common stock are not
issued until the units vest. Restricted stock units are subject to forfeiture for failure to fulfill service conditions. Non-
forfeitable cash dividend equivalents are paid on non-vested restricted stock units.

Restricted stock unit activity for the year ended December 31, 2009 follows:

Non-vested restricted stock units outstanding at beginning of year . . . . . . . . . .
Granted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vested . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Forfeited . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shares

17,500
6,500
(5,833)
(2,000)

Non-vested restricted stock units outstanding at end of year. . . . . . . . . . . . . . .

16,167

Weighted
Average
Grant Date
Fair Value

$31.60
$14.39
$31.60
$14.39

$26.81

Performance Unit Awards. On April 28, 2009, the Company granted performance unit awards to certain
executive officers (the “2009 Performance Units”). The 2009 Performance Units provide for those executive
officers to receive a cash payment upon the achievement of certain performance goals established by the Company
during a specified period. The performance period for the 2009 Performance Units is the period from April 1, 2009
through March 31, 2012. The performance goals for the 2009 Performance Units are tied to the Company’s total
shareholder return for the performance period as compared to total shareholder return for a peer group determined
by the Compensation Committee. These goals are considered to be market conditions under the relevant accounting
standards. Generally, the recipients will receive a base payment if the Company’s total shareholder return is positive
and, when compared to the peer group, is at or above the 25th percentile but less than the 50th percentile; two times
the base if at or above the 50th percentile but less than the 75th percentile, and four times the base if at the 75th
percentile or higher. The total base amount with respect to the 2009 Performance Units is approximately
$1.7 million. As the 2009 Performance Units are to be settled in cash at the end of the performance period,
the Company’s pro-rated obligation is measured at estimated fair value at the end of each reporting period and as of
December 31, 2009 this pro-rated obligation was approximately $859,000.

Dividends on Equity Awards — Non-forfeitable cash dividends and dividend equivalents paid on equity

awards are recognized as follows:

(cid:129) Dividends are recognized as reductions of retained earnings for the portion of restricted stock awards

expected to vest.

F-21

(cid:129) Dividends are recognized as additional compensation cost for the portion of restricted stock awards that are

not expected to vest or that ultimately do not vest.

(cid:129) Dividend equivalents are recognized as additional compensation cost for restricted stock units.

12. Leases

The Company incurred rent expense of $11.9 million, $31.5 million and $27.6 million for the years 2009, 2008
and 2007, respectively. Rent expense is primarily related to short-term equipment rentals that are passed through to
customers. The Company’s obligations under non-cancelable operating lease agreements are not material to the
Company’s operations or cash flows.

13.

Income Taxes

Components of the income tax provision applicable to Federal, state and foreign income taxes for the years

ended December 31, 2009, 2008 and 2007 are as follows (in thousands):

2009

2008

2007

Federal income tax expense (benefit):

Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $(117,493)
103,574
Deferred . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

$117,367
57,879

$169,634
36,911

State income tax expense (benefit):

Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Deferred . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Foreign income tax expense (benefit):

Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Deferred . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(13,919)

175,246

206,545

(1,883)
(1,875

(3,758)

338
(256)

82

6,475
7,070

13,545

4,256
443

4,699

16,174
987

17,161

5,220
424

5,644

Total income tax expense (benefit):

Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Deferred . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(119,038)
101,443

128,098
65,392

191,028
38,322

Total income tax expense (benefit) . . . . . . . . . . . . . . . . . . . . . $ (17,595)

$193,490

$229,350

The difference between the statutory Federal income tax rate and the effective income tax rate for the years

ended December 31, 2009, 2008 and 2007 is summarized as follows:

2009

2008

2007

Statutory tax rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
State income taxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Permanent differences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other, net . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

35.0% 35.0% 35.0%
1.7
4.7
(1.2)
(5.7)
(0.2)
0.1

1.4
(1.6)
(0.3)

Effective tax rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

34.1% 35.3% 34.5%

F-22

The tax effect of significant temporary differences representing deferred tax assets and liabilities and changes

therein were as follows (in thousands):

December 31,
2009

Net
Change

December 31,
2008

Net
Change

December 31,
2007

Net
Change

December 31,
2006

Deferred tax assets:

Current:

Net operating loss

carryforwards . . . . . . . . .

$

— $

— $

— $

(374) $

374 $ (1,496) $

1,870

Workers’ compensation

allowance . . . . . . . . . . . .
Embezzlement costs . . . . . .
Other . . . . . . . . . . . . . . . . .

Non-current:

Net operating loss

carryforwards . . . . . . . . .
AMT credit . . . . . . . . . . . . .
Expense associated with

employee stock options . .

Federal benefit of foreign

24,624
773
18,843

44,240

(1,360)
45
(2,780)

25,984
728
21,623

(602)
68
3,219

26,586
660
18,404

223
(13,634)
3,903

26,363
14,294
14,501

(4,095)

48,335

2,311

46,024

(11,004)

57,028

4,872
—

4,872
—

—
—

—
(118)

—
118

(374)
—

374
118

9,129

2,500

6,629

1,381

5,248

2,186

3,062

deferred tax liabilities . . .

9,160

(256)

9,416

443

8,973

Federal benefit of state

deferred tax liabilities . . .
Other . . . . . . . . . . . . . . . . .

9,772
9,485

2,702
4,120

7,070
5,365

42,418

13,938

28,480

Total deferred tax assets . . . . . . .

86,658

9,843

76,815

1,643
614

3,963

6,274

Deferred tax liabilities:

Current:

424

735
704

8,549

4,692
4,047

5,427
4,751

24,517

3,675

20,842

70,541

(7,329)

77,870

Other . . . . . . . . . . . . . . . . .

(11,363)

1,044

(12,407)

(1,753)

(10,654)

(2,493)

(8,161)

Non-current:

Property and equipment

basis difference . . . . . . . .
Other . . . . . . . . . . . . . . . . .

(413,113)
(10,961)

(110,786)
(7,091)

(302,327)
(3,870)

(70,362)
8,172

(231,965)
(12,042)

(28,465)
(6,741)

(203,500)
(5,301)

(424,074)

(117,877)

(306,197)

(62,190)

(244,007)

(35,206)

(208,801)

Total deferred tax liabilities . . . .

(435,437)

(116,833)

(318,604)

(63,943)

(254,661)

(37,699)

(216,962)

Net deferred tax liability . . . . . . .

$(348,779) $(106,990) $(241,789) $(57,669) $(184,120) $(45,028) $(139,092)

In assessing the realizability of deferred tax assets, management considers whether it is more likely than not
that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets
is dependent upon the generation of future taxable income during the periods in which those temporary differences
become deductible. Management considers the scheduled reversal of deferred tax liabilities, projected future
taxable income and tax planning strategies in making this assessment. The Company expects the deferred tax assets
at December 31, 2009 and 2008 to be realized as a result of the reversal of existing taxable temporary differences
giving rise to deferred tax liabilities and the generation of taxable income; therefore, no valuation allowance is
necessary.

Other deferred tax assets consist primarily of the tax effect of various allowance accounts and tax-deferred
expenses expected to generate future tax benefit of approximately $28 million. Other deferred tax liabilities consist

F-23

primarily of the tax effect of receivables from insurance companies and tax-deferred income not yet recognized for
tax purposes.

For income tax purposes, the Company generated approximately $450 million of Federal and state net
operating losses during the year ended December 31, 2009. Of this amount, approximately $378 million will be
carried back to prior years, and the remaining balance can be carried forward to future years. The net operating
losses that can be carried forward, if unused, are scheduled to expire as follows: 2014 — $7 million; 2019 —
$15 million and 2029 — $50 million.

The Company adopted a new accounting standard on January 1, 2007 which clarified the accounting for
uncertainty in income taxes recognized in an enterprise’s financial statements and prescribed a recognition
threshold and measurement attribute for the financial statement recognition and measurement of a tax position
taken or expected to be taken in a tax return. As a result of the adoption of this standard in 2007, the Company
reduced a reserve for an uncertain tax position related to a prior business combination that had originally been
recorded as goodwill (see Note 5). The impact of adjustments to reserves with respect to other uncertain tax
positions was not material. As of December 31, 2009, the Company had no unrecognized tax benefits. The
Company has established a policy to account for interest and penalties related to uncertain income tax positions as
operating expenses. As of December 31, 2009, the tax years ended December 31, 2006 through December 31, 2008
are open for examination by U.S. taxing authorities. As of December 31, 2009, the tax years ended December 31,
2005 through December 31, 2008 are open for examination by Canadian taxing authorities.

14. Employee Benefits

The Company maintains a 401(k) plan for all eligible employees. The Company’s operating results include
expenses of approximately $2.8 million in 2009, $4.5 million in 2008 and $4.0 million in 2007 for the Company’s
cash contributions to the plan.

15. Business Segments

The Company’s revenues, operating profits and identifiable assets are primarily attributable to three business
segments: (i) contract drilling of oil and natural gas wells, (ii) pressure pumping services and (iii) the investment, on
a working interest basis, in oil and natural gas properties. Each of these segments represents a distinct type of
business. These segments have separate management teams which report to the Company’s chief operating decision
maker. The results of operations in these segments are regularly reviewed by the chief operating decision maker for
purposes of determining resource allocation and assessing performance. As discussed in Note 2, the Company
exited the drilling and completion fluids services business which previously was reported as a business segment in
January 2010. Operating results for that business for the years ended December 31, 2009, 2008 and 2007 are
presented as discontinued operations in the consolidated statements of operations.

Contract Drilling — The Company markets its contract drilling services to major and independent oil and
natural gas operators. As of December 31, 2009, the Company had 341 marketable land-based drilling rigs, of which
73 of the drilling rigs were based in west Texas and southeastern New Mexico; 100 in north central and east Texas,
northern Louisiana and Mississippi; 56 in the Rocky Mountain region (Colorado, Utah, Wyoming, Montana and
North Dakota); 49 in south Texas; 28 in the Texas panhandle, Oklahoma and Arkansas; 20 in western Canada; and
15 in the Appalachian Basin.

For the years ended December 31, 2009, 2008 and 2007, contract drilling revenue earned in Canada was
$45.4 million, $88.5 million and $72.9 million, respectively. Additionally, we had long-lived assets within our
contract drilling segment located in Canada of $69.2 million and $67.2 million as of December 31, 2009 and 2008,
respectively.

Pressure Pumping — The Company provides pressure pumping services primarily in the Appalachian Basin.
Pressure pumping services consist primarily of well stimulation and cementing for the completion of new wells and
remedial work on existing wells. Well stimulation involves processes inside a well designed to enhance the flow of
oil, natural gas, or other desired substances from the well. Cementing is the process of inserting material between
the hole and the pipe to center and stabilize the pipe in the hole.

F-24

Oil and Natural Gas — The Company has been engaged in the development, exploration, acquisition and
production of oil and natural gas. Through October 31, 2007, the Company served as operator with respect to several
properties and was actively involved in the development, exploration, acquisition and production of oil and natural
gas. Effective November 1, 2007 the Company sold the related operations portion of its exploration and production
business. The Company continues to own and invest in oil and natural gas assets as a working interest owner. The
Company’s oil and natural gas interests are located primarily in Texas and New Mexico.

The following tables summarize selected financial information relating to the Company’s business segments

(in thousands):

Revenues:

Years Ended December 31,
2008

2007

2009

Contract drilling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 600,423
161,441
Pressure pumping . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21,218
Oil and natural gas . . . . . . . . . . . . . . . . . . . . . . . . . . . .

$1,808,600
217,494
42,360

$1,744,884
202,812
41,637

Total segment revenues. . . . . . . . . . . . . . . . . . . . . . . . .
Elimination of intercompany revenues(a) . . . . . . . . . . . .

783,082
(1,136)

2,068,454
(4,574)

1,989,333
(3,237)

Total revenues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 781,946

$2,063,880

$1,986,096

Income (loss) from continuing operations before income

taxes:
Contract drilling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ (11,219)
1,017
Pressure pumping . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
950
Oil and natural gas . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Corporate and other . . . . . . . . . . . . . . . . . . . . . . . . . . .
Embezzlement recoveries(b) . . . . . . . . . . . . . . . . . . . . .
Net (loss) gain on asset disposals(c) . . . . . . . . . . . . . . .
Interest income. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interest expense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Income (loss) from continuing operations before income

(9,252)
(35,577)
—
(3,385)
381
(4,148)
426

$ 520,636
42,019
13,711

$ 558,792
64,257
10,998

576,366
(34,596)
—
4,163
1,553
(630)
502

634,047
(31,124)
43,955
16,432
2,351
(2,187)
363

taxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ (51,555)

$ 547,358

$ 663,837

Identifiable assets:

Contract drilling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $2,129,567
213,094
Pressure pumping . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25,355
Oil and natural gas . . . . . . . . . . . . . . . . . . . . . . . . . . . .
294,136
Corporate and other(d) . . . . . . . . . . . . . . . . . . . . . . . . .

$2,255,421
210,805
31,760
214,831

$2,132,910
154,120
37,885
140,284

Total assets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $2,662,152

$2,712,817

$2,465,199

Depreciation, depletion and impairment:

Contract drilling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 248,424
27,589
Pressure pumping . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12,927
Oil and natural gas . . . . . . . . . . . . . . . . . . . . . . . . . . . .
907
Corporate and other . . . . . . . . . . . . . . . . . . . . . . . . . . .

$ 239,700
19,600
15,856
834

$ 213,812
14,311
17,410
813

Total depreciation, depletion and impairment . . . . . . . . . . $ 289,847

$ 275,990

$ 246,346

F-25

Years Ended December 31,
2008

2007

2009

Capital expenditures:

Contract drilling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 395,376
43,144
Pressure pumping . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7,341
Oil and natural gas . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6,785
Corporate and other . . . . . . . . . . . . . . . . . . . . . . . . . . .

$ 360,645
61,289
22,981
511

$ 539,506
47,582
17,516
—

Total capital expenditures . . . . . . . . . . . . . . . . . . . . . . . . . $ 452,646

$ 445,426

$ 604,604

(a)

Includes contract drilling intercompany revenues related to drilling services provided for wells in which the
Company owns a working interest.

(b) The Company’s former CFO has pleaded guilty to criminal charges and has been sentenced and is serving a
term of imprisonment arising out of his embezzlement of funds from the Company prior to his termination in
2005. The net embezzlement recovery in 2007 includes the recognition of the recovery of assets seized by a
court appointed receiver, net of related professional fees.

(c) Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive
management group. Accordingly, the related gains or losses have been separately presented and excluded from
the results of specific segments.

(d) Corporate and other assets primarily include identifiable assets associated with the Company’s former drilling
and completion fluids segment as well as cash on hand managed by the parent corporation and certain deferred
Federal income tax assets.

16. Concentrations of Credit Risk

Financial instruments, which potentially subject the Company to concentrations of credit risk, consist

primarily of demand deposits, temporary cash investments and trade receivables.

The Company believes it has placed its demand deposits and temporary cash investments with high credit-
quality financial institutions. At December 31, 2009 and 2008, the Company’s demand deposits and temporary cash
investments consisted of the following (in thousands):

Deposits in FDIC and SIPC-insured institutions under insurance limits . . . . . . $ 20,543
47,376
Deposits in FDIC and SIPC-insured institutions over insurance limits. . . . . . .
4,383
Deposits in foreign banks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

$

588
79,387
18,805

Less outstanding checks and other reconciling items . . . . . . . . . . . . . . . . . . .

72,302
(22,425)

98,780
(17,557)

Cash and cash equivalents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 49,877

$ 81,223

2009

2008

Concentrations of credit risk with respect to trade receivables are primarily focused on companies involved in
the exploration and development of oil and natural gas properties. The concentration is somewhat mitigated by the
diversification of customers for which the Company provides services. As is general industry practice, the Company
typically does not require customers to provide collateral. No significant losses from individual customers were
experienced during the years ended December 31, 2009, 2008, or 2007. The Company recognized bad debt expense
for 2009, 2008 and 2007 of $3.8 million, $4.4 million and $2.9 million, respectively.

The carrying values of cash and cash equivalents, trade receivables and accounts payable approximate fair

value due to the short-term maturity of these items.

F-26

17. Related Party Transactions

Joint Operation of Oil and Natural Gas Properties — Through October 31, 2007, the Company served as
operator with respect to several properties and was actively involved in the development, exploration, acquisition
and production of oil and natural gas. Effective November 1, 2007, the Company sold the operations portion of its
exploration and production business. The Company continues to own and invest in oil and natural gas assets as a
working interest owner. During the time that the Company served as operator, it served as operator with respect to
certain oil and natural gas properties in which certain of its affiliated persons have participated, either individually
or through entities they control. These participations were typically through working interests in prospects or
properties originated or acquired by Patterson Petroleum LLC, a wholly owned subsidiary of Patterson-UTI Energy,
Inc.

During the time that the Company served as operator, sales of working interests to affiliated parties were made
by the Company at its cost, comprised of the Company’s costs of acquiring and preparing the working interests for
sale plus a promote fee in some cases. These costs were paid by the working interest owners on a pro rata basis based
upon their working interest ownership percentage. The price at which working interests were sold to affiliated
persons was the same price at which working interests were sold to unaffiliated persons except that in some cases
the affiliated persons also paid a promote fee. The affiliated persons received oil and natural gas production revenue
(net of royalty) of $19.0 million from these properties in 2007. These persons or entities in turn paid for joint
operating costs (including drilling and other development expenses) of $9.2 million incurred in 2007.

18. Quarterly Financial Information (in thousands, except per share amounts) (unaudited)

1st Quarter

2nd Quarter

3rd Quarter

4th Quarter

2008
Operating revenues . . . . . . . . . . . . . . . . . . . . .
Operating income . . . . . . . . . . . . . . . . . . . . . .
Income from continuing operations, net of

$472,004
119,191

$487,538
122,364

$572,798
166,126

$531,540
138,252

income taxes . . . . . . . . . . . . . . . . . . . . . . .

76,354

75,184

110,047

92,282

Income (loss) from discontinued operations,

net of income taxes. . . . . . . . . . . . . . . . . . .
Net income . . . . . . . . . . . . . . . . . . . . . . . . . .
Basic income (loss) per common share:

From continuing operations . . . . . . . . . . . . .
From discontinued operations . . . . . . . . . . .
Net income . . . . . . . . . . . . . . . . . . . . . . . . .

Diluted income (loss) per common share:

From continuing operations . . . . . . . . . . . . .
From discontinued operations . . . . . . . . . . .
Net income . . . . . . . . . . . . . . . . . . . . . . . . .

1,055
77,409

6,238
81,422

(1,301)
108,746

(12,790)
79,492

$
$
$

$
$
$

0.50
0.01
0.51

0.49
0.01
0.50

$
$
$

$
$
$

0.48
0.04
0.52

0.48
0.04
0.52

$
$
$

$
$
$

0.71
(0.01)
0.70

0.70
(0.01)
0.69

$
$
$

$
$
$

0.60
(0.08)
0.52

0.60
(0.08)
0.52

F-27

2009
Operating revenues . . . . . . . . . . . . . . . . . . . . .
Operating income (loss) . . . . . . . . . . . . . . . . .
Income (loss) from continuing operations, net

1st Quarter

2nd Quarter

3rd Quarter

4th Quarter

$268,209
25,154

$140,497
(25,855)

$159,671
(24,619)

$213,569
(22,894)

of income taxes . . . . . . . . . . . . . . . . . . . . .

15,835

(16,891)

(16,814)

(16,090)

Income (loss) from discontinued operations,

net of income taxes. . . . . . . . . . . . . . . . . . .
Net income (loss) . . . . . . . . . . . . . . . . . . . . . .
Basic income (loss) per common share:

From continuing operations . . . . . . . . . . . . .
From discontinued operations . . . . . . . . . . .
Net income (loss) . . . . . . . . . . . . . . . . . . . .

Diluted income (loss) per common share:

From continuing operations . . . . . . . . . . . . .
From discontinued operations . . . . . . . . . . .
Net income (loss) . . . . . . . . . . . . . . . . . . . .

368
16,203

(852)
(17,743)

(1,766)
(18,580)

(2,080)
(18,170)

$
$
$

$
$
$

0.10
0.00
0.10

0.10
0.00
0.10

$
$
$

$
$
$

(0.11)
(0.01)
(0.12)

(0.11)
(0.01)
(0.12)

$
$
$

$
$
$

(0.11)
(0.01)
(0.12)

(0.11)
(0.01)
(0.12)

$
$
$

$
$
$

(0.11)
(0.01)
(0.12)

(0.11)
(0.01)
(0.12)

As discussed in Note 2, the Company exited the drilling and completion fluids services business in January
2010. The results of operations related to the drilling and completion fluids operating segment have been
reclassified and presented as discontinued operations in the quarterly financial information above.

F-28

PATTERSON-UTI ENERGY, INC. AND SUBSIDIARIES
SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS

Description

Year Ended December 31, 2009
Deducted from asset accounts:

Beginning
Balance

Charged to
Costs and
Expenses

Deductions(1)

Ending
Balance

(In thousands)

Allowance for doubtful accounts . . . . . . . . . . . . . . . . . . .

$ 9,330

$4,700

$3,119

$10,911

Year Ended December 31, 2008
Deducted from asset accounts:

Allowance for doubtful accounts . . . . . . . . . . . . . . . . . . .

$10,014

$4,350

$5,034

$ 9,330

Year Ended December 31, 2007
Deducted from asset accounts:

Allowance for doubtful accounts . . . . . . . . . . . . . . . . . . .

$ 7,484

$2,550

$

20

$10,014

(1) Uncollectible accounts written off net of recoveries.

S-1

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, Patterson-UTI
Energy, Inc. has duly caused this Report on Form 10-K to be signed on its behalf by the undersigned, thereunto duly
authorized.

SIGNATURES

PATTERSON-UTI ENERGY, INC.

By:

/s/ Douglas J. Wall

Douglas J. Wall
President and Chief Executive Officer

Date: February 19, 2010

Pursuant to the requirements of the Securities Exchange Act of 1934, this Report on Form 10-K has been
signed by the following persons on behalf of Patterson-UTI Energy, Inc. and in the capacities indicated as of
February 19, 2010.

Signature

Title

/s/ Mark S. Siegel
Mark S. Siegel

/s/ Douglas J. Wall
Douglas J. Wall
(Principal Executive Officer)

/s/

John E. Vollmer III
John E. Vollmer III
(Principal Financial Officer)

/s/ Gregory W. Pipkin
Gregory W. Pipkin
(Principal Accounting Officer)

/s/ Kenneth N. Berns
Kenneth N. Berns

/s/ Charles O. Buckner
Charles O. Buckner

/s/ Curtis W. Huff
Curtis W. Huff

/s/ Terry H. Hunt
Terry H. Hunt

/s/ Kenneth R. Peak
Kenneth R. Peak

/s/ Cloyce A. Talbott
Cloyce A. Talbott

Chairman of the Board

President and Chief Executive Officer

Senior Vice President — Corporate Development, Chief
Financial Officer and Treasurer

Chief Accounting Officer and Assistant Secretary

Senior Vice President and Director

Director

Director

Director

Director

Director

3.1

3.2

3.3

4.1

4.2

4.3
4.4

10.1
10.2

10.3

10.4

10.5

10.6

10.7

10.8

10.9

EXHIBIT INDEX

Restated Certificate of Incorporation, as amended (filed August 9, 2004 as Exhibit 3.1 to the Company’s
Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and incorporated herein by
reference).
Amendment to Restated Certificate of Incorporation, as amended (filed August 9, 2004 as Exhibit 3.2 to
the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 and
incorporated herein by reference).
Second Amended and Restated Bylaws (filed August 6, 2007 as Exhibit 3.3 to the Company’s Quarterly
Report on Form 10-Q for the quarterly period ended June 30, 2007 and incorporated herein by reference).
Rights Agreement dated January 2, 1997, between Patterson Energy, Inc. and Continental Stock
Transfer & Trust Company (filed January 14, 1997 as Exhibit 2 to the Company’s Registration
Statement on Form 8-A and incorporated herein by reference).
Amendment to Rights Agreement dated as of October 23, 2001 (filed October 31, 2001 as Exhibit 3.4 to
the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2001 and
incorporated herein by reference).
Restated Certificate of Incorporation, as amended (See Exhibits 3.1 and 3.2).
Registration Rights Agreement with Bear, Stearns and Co. Inc., dated March 25, 1994, as assigned by
REMY Capital Partners III, L.P. (filed March 19, 2002 as Exhibit 4.3 to the Company’s Annual Report on
Form 10-K for the fiscal year ended December 31, 2001 and incorporated herein by reference).
For additional material contracts, see Exhibits 4.1, 4.2 and 4.4.
Amended and Restated Patterson-UTI Energy, Inc. 2001 Long-Term Incentive Plan (filed November 27,
2002 as Exhibit 4.4 to Post Effective Amendment No. 1 to the Company’s Registration Statement on
Form S-8 (File No. 333-60470) and incorporated herein by reference).*
Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan (filed July 28, 2003 as
Exhibit 4.7 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2003
and incorporated herein by reference).*
Amendment to the Patterson-UTI Energy, Inc. Amended and Restated 1997 Long-Term Incentive Plan
(filed August 9, 2004 as Exhibit 10.7 to the Company’s Quarterly Report on Form 10-Q for the quarterly
period ended June 30, 2004 and incorporated herein by reference).*
Amended and Restated Patterson-UTI Energy, Inc. 1996 Employee Stock Option Plan (filed July 25, 2001
as Exhibit 4.4 to Post-Effective Amendment No. 1 to the Company’s Registration Statement on Form S-8
(File No. 333-60466) and incorporated herein by reference).*
Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan, including Form of Executive Officer
Restricted Stock Award Agreement, Form of Executive Officer Stock Option Agreement, Form of
Non-Employee Director Restricted Stock Award Agreement and Form of Non-Employee Director Stock
Option Agreement (filed June 21, 2005 as Exhibit 10.1 to the Company’s Current Report on Form 8-K,
and incorporated herein by reference).*
First Amendment to the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (filed June 6, 2008 as
Exhibit 10.1 to the Company’s Current Report on Form 8-K and incorporated herein by reference).
Second Amendment to the Patterson-UTI Energy, Inc. 2005 Long-Term Incentive Plan (filed June 6, 2008
as Exhibit 10.2 to the Company’s Current Report on Form 8-K and incorporated herein by reference).
Form of Cash-Settled Performance Unit Award Agreement pursuant to the Patterson-UTI Energy, Inc.
2005 Long-Term Incentive Plan, as amended from time to time.*

10.10 Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and
between Patterson-UTI Energy, Inc. and Mark S. Siegel (filed on February 4, 2004 as Exhibit 10.2 to the
Company’s Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein
by reference).*

10.11 Employment Agreement, dated as of September 1, 2007 between Patterson-UTI Energy, Inc. and Cloyce
A. Talbott (filed on September 24, 2007 as Exhibit 10.1 to the Company’s Current Report on Form 8-K,
and incorporated herein by reference).*

10.12 Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and
between Patterson-UTI Energy, Inc. and Kenneth N. Berns (filed on February 4, 2004 as Exhibit 10.5 to
the Company’s Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated
herein by reference).*

10.13 Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of January 29, 2004, by and
between Patterson-UTI Energy, Inc. and John E. Vollmer III (filed on February 4, 2004 as Exhibit 10.7 to
the Company’s Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated
herein by reference).*

10.14 Form of Letter Agreement regarding termination, effective as of January 29, 2004, entered into by
Patterson-UTI Energy, Inc. with each of Mark S. Siegel, Kenneth N. Berns and John E. Vollmer III (filed
on February 25, 2005 as Exhibit 10.23 to the Company’s Annual Report on Form 10-K for the year ended
December 31, 2004 and incorporated herein by reference).*

10.15 Form of Indemnification Agreement entered into by Patterson-UTI Energy, Inc. with each of Mark S.
Siegel, Cloyce A. Talbott, Douglas J. Wall, Kenneth N. Berns, Curtis W. Huff, Terry H. Hunt, Kenneth R.
Peak, Charles O. Buckner, John E. Vollmer III, Seth D. Wexler and Gregory W. Pipkin (filed April 28,
2004 as Exhibit 10.11 to the Company’s Annual Report on Form 10-K, as amended, for the year ended
December 31, 2003 and incorporated herein by reference).*

10.16 Severance Agreement between Patterson-UTI Energy, Inc. and Douglas J. Wall, effective as of August 31,
2007 (filed September 4, 2007 as Exhibit 10.3 to the Company’s Current Report on Form 8-K and
incorporated herein by reference).*

10.17 Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of August 31, 2007, by and
between Patterson-UTI Energy, Inc. and Douglas J. Wall (filed September 4, 2007 as Exhibit 10.2 to the
Company’s Current Report on Form 8-K and incorporated herein by reference).*

10.18 Patterson-UTI Energy, Inc. Change in Control Agreement, effective as of November 2, 2009, by and
between Patterson-UTI Energy, Inc. and Seth D. Wexler (filed November 2, 2009 as Exhibit 10.2 to the
Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2009 and
incorporated herein by reference).*

10.19 First Amendment to Change in Control Agreement Between Patterson-UTI Energy, Inc. and Mark S.
Siegel, entered into November 1, 2007 (filed November 5, 2007 as Exhibit 10.8 to the Company’s
Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2007 and incorporated
herein by reference).*

10.20 First Amendment to Change in Control Agreement Between Patterson-UTI Energy, Inc. and Douglas J. Wall,
entered into November 1, 2007 (filed November 5, 2007 as Exhibit 10.9 to the Company’s Quarterly Report on
Form 10-Q for the quarterly period ended September 30, 2007 and incorporated herein by reference).*

10.21 First Amendment to Change in Control Agreement Between Patterson-UTI Energy, Inc. and John E.
Vollmer, III, entered into November 1, 2007 (filed November 5, 2007 as Exhibit 10.10 to the Company’s
Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2007 and incorporated
herein by reference).*

10.22 First Amendment to Change in Control Agreement Between Patterson-UTI Energy, Inc. and Kenneth N.
Berns, entered into November 1, 2007 (filed November 5, 2007 as Exhibit 10.11 to the Company’s
Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2007 and incorporated
herein by reference).*

10.23 Credit Agreement dated March 20, 2009, among Patterson-UTI Energy, Inc., as borrower, Wells Fargo
Bank, N.A., as administrative agent, letter of credit issuer, swing line lender and lender, each of Amegy
Bank, N.A., Comerica Bank, and HSBC Bank USA, N.A., as lender, Bank of America, N.A., as
syndication agent, letter of credit issuer and lender, and The Bank of Tokyo-Mitsubishi UFJ, Ltd. as
documentation agent and lender (filed March 25, 2009 as Exhibit 10.1 to the Company’s Current Report
on Form 8-K and incorporated herein by reference).

10.24 Commitment Increase and Joinder Agreement dated June 19, 2009, among the Company, as borrower,
Regions Bank as the new lender, Bank of America, N.A. as a letter of credit issuer and Wells Fargo Bank,
N.A., as administrative agent, letter of credit issuer, swing line lender and lender (filed August 4, 2009 as
Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q and incorporated herein by reference).
10.25 Letter Agreement dated February 6, 2006 between Patterson-UTI Energy, Inc. and John E. Vollmer III
(filed May 1, 2006 as Exhibit 10.25 to the Company’s Annual Report on Form 10-K, as amended, and
incorporated herein by reference).*
Subsidiaries of the Registrant.
Consent of Independent Registered Public Accounting Firm.
Certification of Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange
Act of 1934, as amended.

21.1
23.1
31.1

31.2

32.1

101

Certification of Chief Financial Officer pursuant to Rule 13a-14(a)/15d-14(a) of the Securities Exchange
Act of 1934, as amended.
Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 USC Section 1350, as
adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
The following materials from Patterson-UTI Energy, Inc.’s Annual Report on Form 10-K for the year
ended December 31, 2009, formatted in XBRL (Extensible Business Reporting Language): (i) the
Consolidated Balance Sheets, (ii) the Consolidated Statements of Operations, (iii) the Consolidated
Statements of Changes in Stockholders’ Equity, (iv) the Consolidated Statements of Cash Flows, (v) Notes
to Consolidated Financial Statements, tagged as blocks of text, and (vi) Valuation and Qualifying
Accounts.

* Management Contract or Compensatory Plan identified as required by Item 15(a)(3) of Form 10-K.

EXHIBIT 31.1

I, Douglas J. Wall, certify that,

CERTIFICATIONS

1. I have reviewed this annual report on Form 10-K of Patterson-UTI Energy, Inc.

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state
a material fact necessary to make the statements made, in light of the circumstances under which such statements
were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report,
fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as
of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure
controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over
financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures
to be designed under our supervision, to ensure that material information relating to the registrant, including its
consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in
which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial
reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of
financial reporting and the preparation of financial statements for external purposes in accordance with
generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this
report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the
period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that
occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an
annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal
control over financial reporting; and

5. The registrant’s other certifying officers and I have disclosed, based on our most recent evaluation of
internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board
of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control
over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record,
process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a

significant role in the registrant’s internal control over financial reporting.

/s/ Douglas J. Wall

Douglas J. Wall
President and Chief Executive
Officer

Date: February 19, 2010

EXHIBIT 31.2

CERTIFICATIONS

I, John E. Vollmer III, certify that:

1. I have reviewed this annual report on Form 10-K of Patterson-UTI Energy, Inc.

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state
a material fact necessary to make the statements made, in light of the circumstances under which such statements
were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report,
fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as
of, and for, the periods presented in this report;

4. The registrant’s other certifying officers and I are responsible for establishing and maintaining disclosure
controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over
financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures
to be designed under our supervision, to ensure that material information relating to the registrant, including its
consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in
which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial
reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of
financial reporting and the preparation of financial statements for external purposes in accordance with
generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this
report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the
period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that
occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an
annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal
control over financial reporting; and

5. The registrant’s other certifying officers and I have disclosed, based on our most recent evaluation of
internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board
of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control
over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record,
process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a

significant role in the registrant’s internal control over financial reporting.

/s/

John E. Vollmer III

John E. Vollmer III
Senior Vice President — Corporate Development,
Chief Financial Officer and Treasurer

Date: February 19, 2010

Exhibit 32.1

CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

NOT FILED PURSUANT TO THE SECURITIES EXCHANGE ACT OF 1934

In connection with the Annual Report of Patterson-UTI Energy, Inc. (the “Company”) on Form 10-K for the
period ending December 31, 2009, as filed with the Securities and Exchange Commission on the date hereof (the
“Report”), Douglas J. Wall, Chief Executive Officer, and John E. Vollmer III, Chief Financial Officer, of the
Company, each certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-
Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange

Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial

condition and results of operations of the Company.

A signed original of this written statement required by Section 906 has been provided to the Company and will

be retained by the Company and furnished to the Securities and Exchange Commission upon request.

/s/ Douglas J. Wall

Douglas J. Wall
Chief Executive Officer
February 19, 2010

John E. Vollmer III

/s/
John E. Vollmer III
Chief Financial Officer
February 19, 2010

P A T T E R S O N - U T I   E N E R G Y ,   I N C .   2 0 0 9   A N N U A L   R E P O R T

C O R P O R A T E   I N F O R M A T I O N

 CORPORATE OFFICE

TRANSFER AGENT

DIRECTORS

CORPORATE OFFICERS

Patterson-UTI Energy, Inc.
450 Gears Road, Suite 500
Houston, Texas  77067
Telephone: (281) 765-7100
Fax: (281) 765-7175
www.patenergy.com

Continental Stock 
Transfer & Trust Company
17 Battery Place, 8th Floor
New York, NY 10004
Telephone: (212) 509-4000
www.continentalstock.com 

COMMON STOCK

INDEPENDENT AUDITOR

Nasdaq: PTEN

PricewaterhouseCoopers LLP

Mark S. Siegel 
Chairman 

Douglas J. Wall 
President and
Chief Executive Offi cer 

Kenneth N. Berns 
Senior Vice President 

John E. Vollmer III 
Senior Vice President –
Corporate Development,
Chief Financial Offi cer
and Treasurer 

Seth D. Wexler 
General Counsel
and Secretary

Gregory W. Pipkin
Chief Accounting Offi cer
and Assistant Secretary

Mark S. Siegel 
Chairman, Patterson-UTI Energy, Inc.;
President, Remy Investors and 
Consultants, Incorporated 

Kenneth N. Berns 
Senior Vice President,
Patterson-UTI Energy, Inc.

Charles O. Buckner 
Retired Partner,
Ernst & Young LLP

Curtis W. Huff 
Managing Partner
Intervale Capital LLC 

Terry H. Hunt 
Energy Consultant
and Investor 

Kenneth R. Peak 
President and 
Chief Executive Offi cer, 
Contango Oil & Gas 

Cloyce A. Talbott 
Former President and
Chief Executive Offi cer, 
Patterson-UTI Energy, Inc.

COMPANY PROFILE         Patterson-UTI Energy, Inc. subsidiaries provide 
onshore contract drilling and pressure pumping services to exploration 
and production companies in North America. Patterson-UTI Drilling 
Company LLC has approximately 350 marketable land-based drilling rigs 
that operate primarily in the oil and natural gas producing regions of Texas, 
New Mexico, Oklahoma, Arkansas, Louisiana, Mississippi, Colorado, Utah, 
Wyoming, Montana, North Dakota, Pennsylvania, West Virginia and 
western Canada. Universal Well Services, Inc. provides pressure pumping 
services primarily in the Appalachian Basin.

Patterson-UTI Energy, Inc.
450 Gears Road, Suite 500
Houston, Texas  77067
Telephone: (281) 765-7100
Fax: (281) 765-7175

www.patenergy.com

P A T T E R S O N - U T I   E N E R G Y ,   I N C .           2 0 0 9   A N N U A L   R E P O R T