AS FILED WITH SECURITIES AND EXCHANGE COMMISSION ON AUGUST 1, 2002



                                                      REGISTRATION NO. 333-90440

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                             ---------------------


                                AMENDMENT NO. 1


                                       TO


                                    FORM S-3
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                             ---------------------

                           PATTERSON-UTI ENERGY, INC.
             (Exact name of registrant as specified in its charter)


                                              
                    DELAWARE                                        75-2504748
        (State or other jurisdiction of                (I.R.S. Employer Identification No.)
         incorporation or organization)
                                                                CLOYCE A. TALBOTT
                                                             CHIEF EXECUTIVE OFFICER
                                                            PATTERSON-UTI ENERGY, INC.
              4510 LAMESA HIGHWAY                              4510 LAMESA HIGHWAY
              SNYDER, TEXAS 79549                              SNYDER, TEXAS 79549
                 (915) 574-6300                                   (915) 574-6300
  (Address, including zip code, and telephone        (Name, address, including zip code, and
                    number,                                telephone number, including
      including area code, of registrant's               area code, of agent for service)
          principal executive offices)


                                   COPIES TO:

                               MICHAEL W. CONLON
                          FULBRIGHT & JAWORSKI L.L.P.
                           1301 MCKINNEY, SUITE 5100
                           HOUSTON, TEXAS 77010-3095
                                 (713) 651-5151

     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO PUBLIC:  From time to
time after the effective date of this Registration Statement

     If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box.  [ ]

     If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, please check the following box.  [X]

     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  [ ]

     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, please check the following box and list the Securities
Act registration statement number of the earlier effective registration
statement for the same offering.  [ ]


     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  [ ]


     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


PROSPECTUS

                                 650,000 SHARES

                           PATTERSON-UTI ENERGY, INC.

                                  COMMON STOCK


     This prospectus relates to 650,000 shares of our common stock that may be
offered for sale or otherwise transferred from time to time by certain of our
stockholders. See "Selling Stockholders." The shares were issued by
Patterson-UTI in March 2002 in connection with the acquisition of Odin Drilling,
Inc., a company owned by the selling stockholders.


     We are not offering any shares of our common stock for sale under this
prospectus. We will not receive any of the proceeds from the sale of shares by
selling stockholders under this prospectus.


     Our common stock is quoted on the NASDAQ National Market under the symbol
"PTEN." On July 31, 2002, the closing sales price of our common stock was $23.91
per share.


     Our principal executive office is located at 4510 Lamesa Highway, Snyder,
Texas 79549 and the telephone number is (915) 574-6300.

                             ---------------------


     Prospective purchasers of the common stock should consider carefully the
matters set forth under "Risk Factors" beginning on page 5.


                             ---------------------

     NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SHARES, OR DETERMINED IF THIS
PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

                             ---------------------

     The selling stockholders may offer these shares from time to time in the
over-the-counter market or otherwise. The shares may be sold at market prices
prevailing at the time of sale or at negotiated prices. Any agents, brokers or
dealers through whom sales are made may be deemed to be "underwriters" within
the meaning of the Securities Act of 1933, as amended, and any amounts received
by them in exchange for their services in connection with such sales may be
deemed to be underwriting commissions. The selling stockholders will generally
be responsible for their legal fees and for any commissions or discounts due to
brokers or dealers. The amount of these commissions and discounts will be
negotiated before the sales. We will pay the other offering expenses. See "Plan
of Distribution."


                                 August 1, 2002



     YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED, OR INCORPORATED BY
REFERENCE, IN THIS PROSPECTUS. NEITHER WE NOR THE SELLING STOCKHOLDERS HAVE
AUTHORIZED ANYONE ELSE TO PROVIDE YOU WITH DIFFERENT INFORMATION. IF ANYONE
PROVIDES YOU WITH DIFFERENT OR INCONSISTENT INFORMATION, YOU SHOULD NOT RELY ON
IT. THE SELLING STOCKHOLDERS ARE OFFERING TO SELL, AND SEEKING OFFERS TO BUY
SHARES OF COMMON STOCK ONLY IN JURISDICTIONS WHERE OFFERS AND SALES ARE
PERMITTED. YOU SHOULD ASSUME THAT THE INFORMATION APPEARING IN THIS PROSPECTUS,
AS WELL AS THE INFORMATION WE PREVIOUSLY FILED WITH THE SEC AND INCORPORATED BY
REFERENCE, IS ACCURATE ONLY AS OF THE DATE OF THE DOCUMENTS CONTAINING THE
INFORMATION. IN THIS PROSPECTUS WHEN WE REFER TO PATTERSON-UTI AND USE PHRASES
SUCH AS "WE" AND "OUR" WE ARE GENERALLY REFERRING TO PATTERSON-UTI ENERGY, INC.
AND ITS SUBSIDIARIES AS A WHOLE OR ON A SEGMENT BASIS DEPENDING UPON THE CONTEXT
IN WHICH THE STATEMENTS ARE MADE.
                             ---------------------
                               TABLE OF CONTENTS




                                                              PAGE
                                                              ----
                                                           
Forward Looking Statements..................................    2
Incorporation of Certain Documents by Reference.............    3
Risk Factors................................................    5
Use of Proceeds.............................................    8
Dividend Policy.............................................    8
Selling Stockholders........................................    9
Plan of Distribution........................................   10
Legal Matters...............................................   11
Experts.....................................................   11
Where You Can Find More Information.........................   11



                           FORWARD LOOKING STATEMENTS

     Some statements contained in this prospectus, any accompanying prospectus
supplement, and the documents incorporated by reference are forward-looking
statements within the meaning of Section 27A of the Securities Act of 1933 and
Section 21E of the Securities Exchange Act of 1934. These statements include,
without limitation, statements relating to the utilization rates of land-based
drilling rigs, oil and natural gas prices, demand for oil and natural gas,
budgets, business strategies and other plans, intentions and objectives of our
management for future operations and activities and other such matters. The
words "believes," "budgeted," "plan," "plans," "estimates," "expect," "expects,"
"intends," "strategy," "project," "will," "could," "may" and similar expressions
identify forward-looking statements. Actual results could differ materially from
those expressed in the forward-looking statements. Factors that could cause such
a difference include:

     - Swings in prices and demand for oil and natural gas;

     - Swings in demand for contract drilling, pressure pumping and drilling and
       completion fluids services;

     - Shortages of drill pipe and other drilling equipment;

     - Labor shortages, primarily qualified drilling personnel;

     - Effects of competition from other drilling contractors and providers of
       pressure pumping and drilling and completion fluids services;
                                        2


     - Occurrence of operating hazards and uninsured losses inherent in our
       business operations; and

     - Environmental and other governmental regulation, among others described
       under "Risk Factors" below.

     You are cautioned not to place undue reliance on any of our forward-looking
statements, which speak only as of the date of the document or in the case of
documents incorporated by reference, the date of those documents.

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

     The SEC allows us to "incorporate by reference" information into this
prospectus. This means that we can disclose important information to you by
referring you to another document filed separately by us with the SEC. The
information incorporated by reference is considered to be part of this
prospectus, except for any information that is superseded by information that is
included directly in this document.

     This prospectus includes by reference the documents listed below that we
have previously filed with the SEC and that are not included in or delivered
with this document. They contain important information about our company.

     (1) Patterson-UTI's Annual Report on Form 10-K for the fiscal year ended
December 31, 2001, filed with the SEC on March 19, 2002;


     (2) Patterson-UTI's Quarterly Report on Form 10-Q for the fiscal quarter
ended March 31, 2002, filed with the SEC on May 14, 2002;


     (3) Patterson-UTI's Definitive Proxy Statement dated April 26, 2002
relating to the Annual Meeting of Stockholders held on May 30, 2002;

     (4) Patterson-UTI's Current Report on Form 8-K dated June 13, 2002, filed
with the SEC on June 13, 2002;


     (5) Patterson-UTI's Quarterly Report on Form 10-Q for the fiscal quarter
ended June 30, 2002, filed with the SEC on July 24, 2002;



     (6) Description of Patterson-UTI's common stock contained in the
Registration Statement on Form 8-A filed with the SEC on November 2, 1993; and



     (7) Description of Patterson-UTI's Preferred Stock Purchase Rights
contained in the Registration Statement on form 8-A filed with the SEC on
January 14, 1997.


     We incorporate by reference additional documents that we may file with the
SEC under Section 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of
1934 between the date of this prospectus and the termination of this offering.
These documents include periodic reports, such as Annual Reports on Form 10-K,
Quarterly Reports on Form 10-Q and Current Reports on Form 8-K, as well as proxy
statements.

     We will provide without charge to each person, including any beneficial
owner, to whom this prospectus is delivered, upon written or oral request, a
copy of any document incorporated by reference in this prospectus, other than
exhibits to any such document not specifically described above. Requests for
such documents should be directed to:

                               Jonathan D. Nelson
                            Chief Financial Officer
                           Patterson-UTI Energy, Inc.
                              4510 Lamesa Highway
                                 P.O. Box 1416
                              Snyder, Texas 79550
                                 (915) 574-6300

                                        3



     We have not authorized anyone to give any information or make any
representation about us that is different from, or in addition to, that
contained in this prospectus or in any of the materials that we have
incorporated by reference into this document. Therefore, if anyone does give you
information of this sort, you should not rely on it. If you are in a
jurisdiction where offers to sell, or solicitations of offers to purchase, the
shares of common stock offered by this document is unlawful, or if you are a
person to whom it is unlawful to direct these types of activities, then the
offer presented in this document does not extend to you. The information
contained in this document speaks only as of the date of this document, unless
the information specifically indicates that another date applies.


                                        4


                                  RISK FACTORS

     Ownership of shares of Patterson-UTI common stock involves certain risks.
In determining whether to purchase shares being offered for sale under this
prospectus, you should carefully consider the following risk factors and other
information contained in or incorporated by reference in this prospectus or in
any applicable prospectus supplement.

PATTERSON-UTI IS 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 OPERATIONS.

     Our revenue, profitability and rate of growth are substantially dependent
upon the oil and natural gas industry and prevailing prices for oil and natural
gas. In recent years, oil and natural gas prices and, therefore, the level of
drilling, exploration, development and production, have been extremely volatile.
Prices are affected by:

     - market supply and demand,

     - international military, political and economic conditions, and

     - 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. Beginning in the third quarter
of 2001 and continuing through the date of this prospectus, commodity price
uncertainty has adversely affected our operations. Natural gas prices fell from
an average of $4.41 per Mcf in the second quarter of 2001 to an average of $3.41
per Mcf for the same period in 2002. During this same period, the average number
of the Company's rigs operating dropped by approximately 50%. We expect oil and
natural gas prices to continue to be volatile and to affect our financial
condition and operations and ability to access sources of capital.



A GENERAL EXCESS OF OPERABLE LAND DRILLING RIGS ADVERSELY AFFECTS OUR PROFIT
MARGINS PARTICULARLY IN TIMES OF WEAKER DEMAND.



     The contract drilling business experienced increased demand for drilling
services from 1995 through most of 1997 due to higher oil and natural gas
prices. The increase in demand returned, beginning in mid-1999 and continued
through the second quarter of 2001. However, except for those periods and other
occasional upturns, generally, there have been substantially more drilling rigs
available than necessary to meet demand in most operational and geographic
segments of the North American land drilling industry. As a result, drilling
contractors have had difficulty sustaining profit margins.


     In addition to adverse effects that future declines in demand could have on
Patterson-UTI, ongoing factors which could adversely affect utilization rates
and pricing, even in an environment of stronger oil and natural gas prices and
increased drilling activity, include:

     - movement of drilling rigs from region to region,

     - reactivation of land-based drilling rigs, or

     - new construction of drilling rigs.

     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 PATTERSON-UTI'S 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. These price increases and delays in delivery may require us to
substantially increase capital


                                        5


expenditures in our contract drilling segment. Severe shortages could impair our
ability to operate our drilling rigs.

THE VARIOUS BUSINESS SEGMENTS IN WHICH WE OPERATE ARE HIGHLY COMPETITIVE WITH
EXCESS CAPACITY WHICH MAY ADVERSELY AFFECT OUR OPERATING RESULTS.

     Our land drilling and pressure pumping businesses are intensely competitive
due to the fact that the supply of available land drilling rigs and pressure
pumping equipment exceeds the demand for those rigs and 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.

     Patterson-UTI believes that price competition for drilling and pressure
pumping contracts will continue for the foreseeable future due to the existence
of available rigs and pressure pumping equipment. In addition, some of our
competitors have greater financial resources than we do which may enable them
to:

     - better withstand industry downturns,

     - compete more effectively on the basis of price, and

     - acquire existing rigs or equipment or build new rigs or 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.

     The drilling and completion fluids services industry is highly competitive.
Price is generally the most important competitive factor in the industry. Other
competitive factors include the availability of chemicals and experienced
personnel, the reputation of the fluids services provider in the drilling
industry and our relationship with existing customers. Some of our competitors
have substantially greater resources and longer operating histories than we
have. We believe that competition for drilling and completion fluids service
contracts will continue to be intense.

LABOR SHORTAGES ADVERSELY AFFECT OUR OPERATING RESULTS.


     During periods of increased demand for contract drilling services, the
industry experiences shortages of qualified drilling rig personnel. During these
periods, our ability to attract and retain sufficient qualified personnel to
market and operate our drilling rigs is adversely affected which in turn has a
negative impact on both our operations and profitability. Operationally, it is
more difficult to hire qualified personnel which adversely affects our ability
to mobilize inactive rigs in response to the increased demand for our contract
drilling services. Additionally, wage rates for drilling personnel are likely to
increase, resulting in greater operating costs and reduced operating margins.
During the last upturn in our industry, we experienced an approximate 30% to 40%
increase in wage rates to our drilling personnel which reduced operating
margins.


CONTINUED GROWTH OF PATTERSON-UTI THROUGH RIG ACQUISITION IS NOT ASSURED.

     We have increased our drilling rig fleet over the past several years
through mergers and acquisitions. In May 2001, UTI merged with Patterson in a
so-called "merger of equals." The combination of the two companies doubled the
number of our drilling rigs. The land drilling industry has experienced
significant consolidation over the past several years, and there can be no
assurance that acquisition opportunities will continue to be available.
Additionally, we are likely to continue to face intense competition from other
companies for available acquisition opportunities.

                                        6


     There can be no assurance that we will:

     - have sufficient capital resources to complete additional acquisitions,

     - successfully integrate acquired operations and assets,

     - be able to manage effectively the growth and increased size,

     - be successful in deploying idle or stacked rigs,

     - be able to maintain the crews and market share attributable to operating
       drilling rigs acquired, or

     - be successful in improving our financial condition, results of operation,
       business or prospects in any material manner as a result of any completed
       acquisition.

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

THE NATURE OF OUR BUSINESS OPERATIONS PRESENTS INHERENT RISKS OF LOSS, THAT, IF
NOT INSURED OR INDEMNIFIED AGAINST COULD ADVERSELY AFFECT PATTERSON-UTI'S
OPERATING RESULTS.

     Our operations are subject to many hazards inherent in the contract
drilling, pressure pumping and drilling and completion fluids 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 Patterson-UTI against
liability from all consequences of the 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 such insurance prohibitive.


     While we do not believe that there are any material risks for which we do
not have adequate insurance, we have elected in some cases to accept a greater
amount of risk through increased deductibles on certain insurance policies. For
example, we maintain a $750,000 per occurrence deductible on our worker's
compensation insurance coverage and a $2 million per occurrence with a $4
million aggregate deductible on our general liability insurance coverage. These
levels of self-insurance expose us to increased operating costs and risks.


VIOLATIONS OF ENVIRONMENTAL LAWS AND REGULATIONS COULD MATERIALLY ADVERSELY
AFFECT PATTERSON-UTI OPERATING RESULTS.


     The drilling of oil and natural gas wells is subject to various state,
federal and foreign laws, rules and regulations. The cost to Patterson-UTI of
compliance with these laws and regulations could be substantial. Failure to
comply with these requirements could subject Patterson-UTI to substantial civil
and criminal penalties. In addition, federal law imposes a variety of
regulations on "responsible parties" related to the prevention of oil spills and
liability for damages from such spills. Patterson-UTI, as an owner and operator
of land-based drilling rigs may be deemed to be a responsible party under
federal laws. Our operations and facilities are subject to numerous state and
federal 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.


                                        7



SOME OF OUR CONTRACT DRILLING SERVICES ARE DONE UNDER TURNKEY AND FOOTAGE
CONTRACTS, WHICH ARE FINANCIALLY RISKY.



     A portion of our contract drilling is done under turnkey contracts and
footage contracts, which involve significant risks. Under turnkey contracts, we
contract to drill a well to a certain depth under specified conditions at a
fixed price. Under footage contracts, we contract to drill a well to a certain
depth under specified conditions at a fixed price per foot. The risk to us under
these types of drilling contracts are greater than on a well drilled on a
daywork basis. Unlike daywork contracts, we must bear the cost of performing
drilling services until the target depth is reached. We must also make
significant up-front working capital commitments prior to receiving payment. In
addition, we must assume most of the risk associated with the drilling
operations, generally assumed by the operator of the well on a daywork contract,
including blowouts, loss of hole from fire, machinery breakdowns and abnormal
drilling conditions. Accordingly, if severe drilling problems are encountered in
drilling wells under such contracts, we could suffer substantial losses.


ANTI-TAKEOVER MEASURES IN OUR CHARTER DOCUMENTS AND UNDER STATE LAW COULD
DISCOURAGE AN ACQUISITION OF PATTERSON-UTI AND THEREBY AFFECT THE RELATED
PURCHASE PRICE.

     Patterson-UTI, as a Delaware corporation, is subject to the Delaware
General Corporation Law, including Section 203, an anti-takeover law enacted in
1988. 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 of Patterson-UTI
may 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.

WE HAVE PAID NO DIVIDENDS ON OUR COMMON STOCK AND HAVE NO PLANS TO PAY
DIVIDENDS.

     We have not declared or paid cash dividends on our common stock in the
past. We do not expect to declare or pay any cash dividends on our common stock
in the foreseeable future. The terms of our existing credit facility limit the
payment of dividends without the prior written consent of the lenders.

                                USE OF PROCEEDS

     We will not receive any proceeds from the sale of our common stock by the
selling stockholders.

                                DIVIDEND POLICY

     Patterson-UTI has not paid cash dividends on our common stock in the past
and does not expect to pay any cash dividends on the common stock in the
foreseeable future. Instead, we intend to retain our earnings to support the
operations and growth of our businesses. Any future cash dividends would depend
on future earnings, capital requirements, Patterson-UTI's financial condition
and other factors deemed relevant by our Board of Directors. In addition, the
terms of our existing credit facility limit the payment of dividends without the
prior written consent of the lenders.

                                        8


                              SELLING STOCKHOLDERS

     The following table sets forth the name of each selling stockholder, the
total number of shares of our common stock beneficially owned by each selling
stockholder as of June 11, 2002, and the total number of shares that each
selling stockholder may offer and sell pursuant to this prospectus. The exact
number of shares of common stock that each selling stockholder may retain upon
completion of this offering cannot be determined at this time. However, if all
shares of common stock offered pursuant to this prospectus were sold, upon
completion of this offering no selling stockholder would own more than 1% of our
common stock. None of the selling stockholders has had any position, office or
other material relationship with Patterson-UTI or any of its predecessors or
affiliates within the past three years.



                                                     SHARES                          SHARES
                                                  BENEFICIALLY     SHARES BEING   BENEFICIALLY
                                                  OWNED BEFORE      OFFERED IN    OWNED AFTER
NAME                                                OFFERING       THE OFFERING     OFFERING
----                                             ---------------   ------------   ------------
                                                                         
Roy T. Oliver, Jr. ...........................        801,214(1)     456,790        344,424(1)
Oliver Family Trust F.B.O. William R. Oliver,
  Lee C. Arbogast, Trustee(2).................         38,889         38,889              0
Oliver Family Trust F.B.O. Jackson T. Oliver,
  Lee C. Arbogast, Trustee(2).................         38,889         38,889              0
Michael D. Oliver.............................         85,335(3)      61,729         23,606(4)
Katrina J. Martin.............................          7,353(5)       6,173          1,180(6)
Estate of Wendel Wells........................          6,173          6,173              0
Emily Oliver..................................          9,259          9,259              0
Ashley Oliver Ritenour........................          9,259          9,259              0
Lee C. Arbogast, Custodian for Tyler L.
  Arbogast under Oklahoma UTMA(2).............          3,086          3,086              0
Lee C. Arbogast, Custodian for Kelsey L.
  Arbogast under Oklahoma UTMA(2).............          3,086          3,086              0
Mike Mullen...................................         23,041(7)      16,667          6,374(8)
                                                    ---------        -------        -------
     Totals...................................      1,025,584        650,000        375,584
                                                    =========        =======        =======


---------------

(1) Includes 94,424 shares which may be acquired pursuant to warrants which are
    presently exercisable, including warrants to purchase 11,802 shares which
    are held by Mr. Oliver as custodian for his children, William R. Oliver and
    Jackson T. Oliver.

(2) Mr. Arbogast, as Trustee, has voting and dispositive powers with respect to
    the shares and, therefore, may be deemed the beneficial owner of the shares.

(3) Includes 23,606 shares which may be acquired pursuant to warrants which are
    presently exercisable.

(4) Represents 23,606 shares which may be acquired pursuant to warrants which
    are presently exercisable.

(5) Includes 1,180 shares which may be acquired pursuant to warrants which are
    presently exercisable.

(6) Represents 1,180 shares which may be acquired pursuant to warrants which are
    presently exercisable.

(7) Includes 6,374 shares which may be acquired pursuant to warrants which are
    presently exercisable.

(8) Represents 6,374 shares which may be acquired pursuant to warrants which are
    presently exercisable.

     The shares of our common stock being offered by the selling stockholders in
this offering were issued to the selling stockholders as consideration for the
acquisition of a company owned by them.

     Pursuant to the terms of a registration rights agreement executed in
connection with the acquisition agreement, we will pay all expenses of
registering the shares under the Securities Act, including all registration and
filing fees, printing expenses and the fees and disbursements of our counsel and
accountants. The agreement also provides that we will indemnify the selling
stockholders against certain civil liabilities, including liabilities under the
Securities Act, or will contribute to payments the selling

                                        9


stockholders may be required to make in respect thereof. The selling
stockholders will pay all fees and disbursements of their counsel and all
brokerage fees, commissions and expenses for any shares that are registered and
that they sell. We expect to withdraw registration of any unsold shares on or
shortly after March 20, 2003, when we expect the shares will be eligible for
public sale pursuant to the exemption from registration provided by Rule 144
under the Securities Act.

                              PLAN OF DISTRIBUTION

     The selling stockholders may offer and sell the shares of common stock
offered by this prospectus from time to time in one or more of the following
transactions:

     - in the over-the-counter market, on the NASDAQ National Market or any
       other securities exchange on which our common stock may be then listed;

     - in transactions other than in the over-the-counter market or any such
       exchange (including negotiated transactions and other private
       transactions);

     - in short sales of the common stock, in transactions to cover short sales
       or otherwise in connection with short sales;

     - by pledge to secure debts and other obligations or on foreclosure of a
       pledge;

     - through put or call options, including the writing of exchange-traded
       call options, or other hedging transactions related to the common stock;
       or

     - in a combination of any of the above transactions.

     Any hedging transactions that may be entered into by the selling
stockholders from time to time may include, among others, one or more of the
following transactions, in which a selling stockholder may:

     - enter into transactions with a broker-dealer or any other person in
       connection with which such broker-dealer or other person will engage in
       short sales of the common stock under this prospectus, in which case such
       broker-dealer or other person may use shares of common stock received
       from the selling stockholder to close out its short positions;

     - sell common stock short itself and redeliver shares offered by this
       prospectus to close out its short positions or to close out stock loans
       incurred in connection with their short positions;

     - enter into option or other types of transactions that require the selling
       stockholder to deliver common stock to a broker-dealer or any other
       person, who will then resell or transfer the common stock under this
       prospectus; or

     - loan or pledge the common stock to a broker-dealer or any other person,
       who may sell the loaned shares, or, in an event of default in the case of
       pledge, sell the pledged shares under this prospectus.

     The selling stockholders may use broker-dealers or other persons to sell
their shares in transactions that may include, among others, one or more of the
following:

     - a block trade in which a broker-dealer or other person may resell a
       portion of the block, as principal or agent, in order to facilitate the
       transaction;

     - purchases by a broker-dealer or other person, as principal, and resale by
       the broker-dealer or other person for its account; or

     - ordinary brokerage transactions and transactions in which a broker
       purchases.

     Broker-dealers or other persons may receive discounts or commissions from
the selling stockholders, or they may receive commissions from purchasers of
shares for whom they acted as agents, or both. Broker-dealers or other persons
engaged by the selling stockholders may allow the broker-dealers or other
persons to participate in resales. The selling stockholders may agree to
indemnify any broker-dealer or

                                        10


agent against certain liabilities related to the selling of the shares,
including liabilities arising under the Securities Act.

     The selling stockholders have advised us that they may sell their shares at
market prices prevailing at the time of sale, at prices related to such
prevailing market prices, at negotiated prices or at fixed prices and that the
transactions listed above may include cross or block transactions.

                                 LEGAL MATTERS

     The validity of the shares offered hereby will be passed upon for
Patterson-UTI by Fulbright & Jaworski L.L.P., Houston, Texas.

                                    EXPERTS

     The consolidated financial statements of Patterson-UTI incorporated in this
Prospectus by reference to Patterson-UTI's Annual Report on Form 10-K for the
year ended December 31, 2001, except as they relate to UTI Energy Corp. as of
December 31, 2000 and the two years then ended, have been audited by
PricewaterhouseCoopers LLP, independent accountants, and, insofar as they relate
to UTI Energy Corp., by Ernst & Young LLP, independent accountants, whose report
thereon appears therein. Such financial statements have been so included in
reliance on the reports of such independent accountants given on the authority
of said firm as experts in auditing and accounting.

                      WHERE YOU CAN FIND MORE INFORMATION

     We file annual, quarterly and special reports, proxy statements and other
information with the SEC under the Securities Exchange Act of 1934. You may read
and copy this information at the following locations of the SEC:


                                                  
            Judiciary Plaza, Room 10024              Seven World Trade Center
            450 Fifth Street, N.W.                   Suite 1300
            Washington, D.C. 20549                   New York, New York 10048


                                Citicorp Center
                            500 West Madison Street
                                   Suite 1400
                            Chicago, Illinois 60661

     You can also obtain copies of this information by mail from the Public
Reference Room of the SEC, 450 Fifth Street, N.W., Room 10024, Washington, D.C.
20549, at prescribed rates. You may obtain information on the operation of the
Public Reference Room by calling the SEC at (800) SEC-0330.

     The SEC also maintains an internet world wide web site that contains
reports, proxy statements and other information about issuers, like
Patterson-UTI, that file electronically with the SEC. The address of that site
is http://www.sec.gov.

     You can also inspect reports, proxy statements and other information about
us at the offices of the National Association of Securities Dealers, Inc., 1735
K Street, N.W., Washington, D.C. 20006.

     We have filed with the SEC a registration statement on Form S-3 covering
the shares offered by the prospectus. The registration statement, including the
attached exhibits and schedules, contains additional relevant information about
us and our common stock. The rules and regulations of the SEC allow us to omit
certain information included in the registration statement from this prospectus.

                                        11


                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

     Capitalized terms used but not defined in Part II have the meanings
ascribed to them in the Prospectus included as part of this Registration
Statement.

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

     The following table sets forth the expenses expected to be incurred in
connection with the issuance and distribution of the Securities registered
hereby, all of which expenses, except for the SEC registration fee and the NASD
filing fee, are estimates:




DESCRIPTION                                                     AMOUNT
-----------                                                    --------
                                                            
SEC registration fee........................................   $  1,758
Legal fees and expenses.....................................     12,500
Accounting fees and expenses................................      2,500
Miscellaneous...............................................        742
                                                               --------
  Total.....................................................   $ 17,500
                                                               ========



ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     Section 145 of the Delaware General Corporation Law (the "DGCL") provides
for indemnification by a corporation of costs incurred by directors, employees
and agents in connection with an action, suit or proceeding brought by reason of
their position as a director, employee or agent. The person being indemnified
must have acted in good faith and in a manner he reasonably believed to be in or
not opposed to the best interests of the corporation. The DGCL provides that a
corporation may advance payment of expenses. The DGCL further provides that the
indemnification and advancement of expenses provisions of the DGCL will not be
deemed exclusive of any other rights to which these indemnifications or
advancements of expenses may be entitled under bylaw, agreement, vote of
stockholders or disinterested directors or otherwise, both as to action under
official capacity and as to action in another capacity when holding such office.

     In addition to the general indemnification section, Delaware law provides
further protection for directors under Section 102(b)(7) of the DGCL. This
section was enacted in June 1986 and allows a Delaware corporation to include in
its certificate of incorporation a provision that eliminates and limits certain
personal liability of a director for monetary damages for certain breaches of
the director's fiduciary duty of care, provided that any such provision does not
(in the words of the statute) do any of the following:

     [E]liminate or limit the liability of a director (i) for any breach of the
     director's duty of loyalty to the corporation or its stockholders, (ii) for
     acts or omissions not in good faith or which involve intentional misconduct
     or a knowing violation of law, (iii) under Section 174 of this Title
     (dealing with willful or negligent violation of the statutory provision
     concerning dividends and stock purchases and redemptions), or (iv) for any
     transaction from which the director derived an improper personal benefit.
     No such provision shall eliminate or limit the liability of a director for
     any act or omission occurring prior to the date when such provision becomes
     effective...

     The Board of Directors is empowered to make other indemnification as
authorized under any bylaw, agreement, the Certificate of Incorporation, Bylaws
or corporate resolution so long as the indemnification is consistent with the
DGCL.

     Patterson-UTI's Restated Certificate of Incorporation, as amended, provides
that, to the fullest extent permitted by the DGCL, a director of Patterson-UTI
will not be liable to Patterson-UTI or its stockholders for monetary damages for
breach of fiduciary duty as a director. Patterson-UTI's Amended and Restated
Bylaws provide that Patterson-UTI, to the maximum extent and in the manner
permitted by

                                       II-1


the DGCL, shall indemnify each of its directors and officers against expenses
(including attorneys' fees), judgments, fines, settlements and other amounts
actually and reasonably incurred in connection with any proceeding, arising by
reason of the fact that such person is or was an agent of Patterson-UTI,
provided however, that Patterson-UTI may modify the extent of such
indemnification by individual contracts with its directors and executive
officers and, provided further, that Patterson-UTI shall not be required to
indemnify any director or officer in connection with any proceeding (or part
thereof) initiated by such person unless (i) such indemnification is expressly
required to be made by law, (ii) the proceeding was authorized in advance by the
board of directors of Patterson-UTI, (iii) such indemnification is provided by
Patterson-UTI, in its sole discretion, pursuant to the powers vested in
Patterson-UTI under the DGCL or (iv) such indemnification is required to be made
pursuant to an individual contract. Patterson-UTI's Amended and Restated Bylaws
also provide that Patterson-UTI shall advance the payment of expenses.
Patterson-UTI maintains director and officer liability insurance covering
director and officer indemnification.

     Patterson-UTI also has an Indemnity Agreement with each of its directors
and executive officers. The standard for indemnification under the Indemnity
Agreement is substantially the same as under Patterson-UTI's Amended and
Restated Bylaws, as amended. The Indemnity Agreement, however, provides for the
creation of a trust account in the event of a "change in control" (as defined in
the Indemnity Agreement), funded in an amount sufficient to reasonably satisfy
any and all expenses incurred by a director or executive officer in connection
with investigating, preparing for, participating in, and/or defending any
proceeding relating to any Indemnifiable Event (as defined in the Indemnity
Agreement). The trustee of such trust account is to be selected by the director
or executive officer receiving the indemnity under the Indemnity Agreement.

     In the Agreement and Plan of Merger between Patterson Energy, Inc. and UTI
Energy Corp. dated as of February 4, 2001, pursuant to which UTI Energy Corp.
("UTI") merged with and into Patterson Energy, Inc. with Patterson-UTI as the
surviving corporation ("Merger"), Patterson-UTI agreed to indemnify the former
officers and directors of UTI from liabilities arising out of actions or
omissions in their capacity as such prior to the effective time of the Merger,
and advance reasonable litigation expenses incurred in connection with such
actions or omissions, to the full extent permitted under UTI's certificate of
incorporation and bylaws. Further, for a period of six years after the effective
time of the Merger, Patterson-UTI will provide the former officers and directors
of UTI with an insurance and indemnification policy that provides coverage
through the effective time of the Merger; provided that the maximum aggregate
amount of premiums that Patterson-UTI will be required to pay to provide and
maintain this coverage does not exceed $300,000 per year.

ITEM 16.  EXHIBITS.

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




EXHIBIT
NUMBER                                 DESCRIPTION
-------                                -----------
         
  2.1     --   Plan and Agreement of Merger dated October 14, 1993, between
               Patterson Energy, Inc., a Texas corporation and Patterson
               Energy, Inc., a Delaware corporation, together with related
               Certificate of Merger (1)
  2.2     --   Agreement and Plan of Merger, dated as of April 12, 1996,
               among Patterson-UTI Energy, Inc., Patterson-UTI Drilling
               Company and Tucker Drilling Company, Inc. and amendment
               thereto, dated May 16, 1996 (2)
  2.2     --   Agreement and Plan of Merger, dated February 4, 2001, by and
               between UTI Energy Corp. and Patterson Energy, Inc. (3)
  4.1     --   Excerpt from Restated Certificate of Incorporation, as
               amended, of Patterson-UTI Energy, Inc. regarding authorized
               Common Stock and Preferred Stock (4)
  5.1     --   Opinion of Fulbright & Jaworski L.L.P. regarding the
               legality of the shares to be offered (5)
 10.1     --   Agreement and Plan of Merger, dated as of March 10, 2002,
               among Patterson-UTI Energy, Inc., Patterson-UTI Drilling
               Company LP, LLLP, and Odin Drilling, Inc. (6)



                                       II-2





EXHIBIT
NUMBER                                 DESCRIPTION
-------                                -----------
         
 23.1     --   Consent of independent accountants, PricewaterhouseCoopers
               LLP (5)
 23.2     --   Consent of independent auditors, Ernst & Young LLP (5)
 23.3     --   Consent of Fulbright & Jaworski L.L.P. (included in Exhibit
               5.1)
 24.1     --   Power of Attorney (5)



---------------

(1) Incorporated by reference to Item 27, "Exhibits" to Amendment to No. 2 to
    Registration Statement on Form SB-2 (Filed No. 33-68058-FW) filed on October
    28, 1993.

(2) Incorporated by reference to Item 7, "Financial Statements and Exhibits" to
    Form 8-K dated April 22, 1996, and filed with the SEC on April 30, 1996.

(3) Incorporated by reference to Item 7, "Financial Statements and Exhibits" to
    Form 8-K dated February 4, 2001, and filed with the SEC on February 16,
    2001.

(4) Incorporated by reference to Item 6, "Exhibits and Reports on Form 8-K" to
    Form 10-Q for the quarterly period ended June 30, 2001 and filed on August
    1, 2001.


(5) Previously filed.



(6) Incorporated by reference to Item 6, "Exhibits and Reports on Form 8-K" to
    Form 10-Q for the quarterly period ended March 31, 2002 and filed on May 14,
    2002.


ITEM 17.  UNDERTAKINGS.

     1. Patterson-UTI hereby undertakes:

          (a) To file, during any period in which offers or sales are being
     made, a post-effective amendment to this Registration Statement:

             (i) to include any prospectus required by Section 10(a)(3) of the
        Securities Act of 1933;

             (ii) to reflect in the Prospectus any facts or events arising after
        the effective date of the Registration Statement (or the most recent
        post-effective amendment thereof) which, individually or in the
        aggregate, represent a fundamental change in the information set forth
        in the Registration Statement. Notwithstanding the foregoing, any
        increase or decrease in volume of securities offered (if the total
        dollar value of such securities offered would not exceed that which was
        registered) and any deviation from the low or high end of the estimated
        maximum offering range may be reflected in the form of prospectus filed
        with the commission pursuant to Rule 424(b) if, in the aggregate, the
        changes in volume and price represent no more than a 20% change in the
        maximum aggregate offering price set forth in the "Calculation of
        Registration Fee" table in the effective registration statement; and

             (iii) to include any material information with respect to the plan
        of distribution not previously disclosed in the Registration Statement
        or any material change to such information in the Registration
        Statement;

     provided, however, that paragraphs (1)(a)(i) and (1)(a)(ii) do not apply if
     the information required to be included in a post-effective amendment by
     those paragraphs is contained in periodic reports filed by Patterson-UTI
     pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of
     1934 that are incorporated by reference in this Registration Statement.

          (b) That, for the purpose of determining any liability under the
     Securities Act of 1933, each such post-effective amendment shall be deemed
     to be a new registration statement relating to the securities offered
     therein, and the offering of such securities at that time shall be deemed
     to be the initial bona fide offering thereof.

          (c) To remove from registration by means of a post-effective amendment
     any of the securities being registered which remain unsold at the
     termination of the offering.

                                       II-3


          (d) That, for purposes of determining any liability under the
     Securities Act of 1933, each filing of Patterson-UTI's annual report
     pursuant to Section 13(a) or Section 15(d) of the Securities Exchange Act
     of 1934 that is incorporated by reference in this Registration Statement
     shall be deemed to be a new registration statement relating to the
     securities offered therein, and the offering of such securities at that
     time shall be deemed to be the initial bona fide offering thereof.

     2. Insofar as indemnification for liabilities arising under the Securities
Act of 1933 (the "Securities Act") may be permitted to directors, officers and
controlling persons of Patterson-UTI pursuant to the foregoing provisions, or
otherwise, Patterson-UTI has been advised that in the opinion of the Securities
and Exchange Commission such indemnification is against public policy as
expressed in the Securities Act and is, therefore, unenforceable. In the event
that a claim for indemnification against such liabilities (other than the
payment by Patterson-UTI of expenses incurred or paid by a director, officer or
controlling person of Patterson-UTI in the successful defense of any action,
suit or proceeding) is asserted by such director, officer or controlling person
in connection with the securities being registered, Patterson-UTI will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the
Securities Act and will be governed by the final adjudication of such issue.

                                       II-4


                                   SIGNATURES


     Pursuant to the requirements of the Securities Act of 1933, Patterson-UTI
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Snyder, State of Texas, on the 1st day of August,
2002.


                                          PATTERSON-UTI ENERGY, INC.

                                          By:    /s/ A. GLENN PATTERSON
                                            ------------------------------------
                                                     A. Glenn Patterson
                                                         President


     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed as of August 1, 2002, by the following
persons in the capacities indicated:




                                                        

                 /s/ CLOYCE A. TALBOTT*                           Chief Executive Officer, Director
 ------------------------------------------------------             (principal executive officer)
                   Cloyce A. Talbott

                /s/ JONATHAN D. NELSON*                        Vice President, Chief Financial Officer,
 ------------------------------------------------------       Secretary, Treasurer (principal financial
                   Jonathan D. Nelson                         officer and principal accounting officer)

                  /s/ MARK S. SIEGEL*                              Chairman of the Board, Director
 ------------------------------------------------------
                     Mark S. Siegel

                 /s/ A. GLENN PATTERSON                         President, Chief Operating Officer and
 ------------------------------------------------------                        Director
                   A. Glenn Patterson

                 /s/ KENNETH N. BERNS*                                         Director
 ------------------------------------------------------
                    Kenneth N. Berns

                /s/ STEPHEN J. DEGROAT*                                        Director
 ------------------------------------------------------
                   Stephen J. DeGroat

                  /s/ ROBERT C. GIST*                                          Director
 ------------------------------------------------------
                     Robert C. Gist

                  /s/ CURTIS W. HUFF*                                          Director
 ------------------------------------------------------
                     Curtis W. Huff

                  /s/ KENNETH R. PEAK*                                         Director
 ------------------------------------------------------
                    Kenneth R. Peak

                  /s/ NADINE C. SMITH*                                         Director
 ------------------------------------------------------
                    Nadine C. Smith


               *By/s/ A. GLENN PATTERSON
 ------------------------------------------------------
                   A. Glenn Patterson
                  as attorney-in-fact



                                       II-5