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


                                  SCHEDULE 13D
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                                (AMENDMENT NO. 1)

                           Hanover Compressor Company
--------------------------------------------------------------------------------
                                (Name of Issuer)

                    Common Stock, par value $0.001 per share
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   410768 10 5
--------------------------------------------------------------------------------
                                 (CUSIP Number)

              Dean Ferris, c/o Schlumberger Technology Corporation,
              300 Schlumberger Drive, MD:23, Sugarland, Texas 77478
--------------------------------------------------------------------------------
           (Name, Address and Telephone Number of Person Authorized to
                       Receive Notices and Communications)

                                 August 31, 2001
--------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition that is the subject of this Schedule 13D, and is filing this
schedule because of ss.ss. 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the
following box (TM).

NOTE: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. Seess. 240.13d-7 for other
parties to whom copies are to be sent.

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).


POTENTIAL PERSONS WHO ARE TO RESPOND TO THE SOLICITATION OF INFORMATION
CONTAINED IN THIS FORM ARE NOT REQUIRED TO RESPOND UNLESS THE FORM DISPLAYS A
CURRENTLY VALID OMB CONTROL NUMBER.

SEC 1746 (03-00)



CUSIP NO.   410768 10 5
--------------------------------------------------------------------------------

1.   NAMES OF REPORTING PERSONS.
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

     Schlumberger Technology Corporation   22-1692661
--------------------------------------------------------------------------------

2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP(SEE INSTRUCTIONS)

     (a)
     (b)
--------------------------------------------------------------------------------
3.   SEC USE ONLY


--------------------------------------------------------------------------------
4.   SOURCE OF FUNDS(SEE INSTRUCTIONS) OO


--------------------------------------------------------------------------------
5.   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)


--------------------------------------------------------------------------------
6.   CITIZENSHIP OR PLACE OF ORGANIZATION

     TEXAS
--------------------------------------------------------------------------------
               7    SOLE VOTING POWER

  NUMBER OF            51,491
   SHARES      -----------------------------------------------------------------
BENEFICIALLY   8    SHARED VOTING POWER
  OWNED BY
    EACH                 0
 REPORTING     -----------------------------------------------------------------
   PERSON      9    SOLE DISPOSITIVE POWER
    WITH
                       51,491
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER

                         0
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      51,491
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
     (SEE INSTRUCTIONS)


--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      Less than 0.1%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

      CO
--------------------------------------------------------------------------------




CUSIP NO.   410768 10 5

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

1.   NAMES OF REPORTING PERSONS.
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

     Schlumberger Surenco S.A.
--------------------------------------------------------------------------------

2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP(SEE INSTRUCTIONS)

     (a)
     (b)
--------------------------------------------------------------------------------
3.   SEC USE ONLY


--------------------------------------------------------------------------------
4.   SOURCE OF FUNDS(SEE INSTRUCTIONS) OO


--------------------------------------------------------------------------------
5.   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)


--------------------------------------------------------------------------------
6.   CITIZENSHIP OR PLACE OF ORGANIZATION

     PANAMA
--------------------------------------------------------------------------------
               7    SOLE VOTING POWER

  NUMBER OF            1,430,304
   SHARES      -----------------------------------------------------------------
BENEFICIALLY   8    SHARED VOTING POWER
  OWNED BY
    EACH                 0
 REPORTING     -----------------------------------------------------------------
   PERSON      9    SOLE DISPOSITIVE POWER
    WITH
                       1,430,304
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER

                         0
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      1,430,304
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
     (SEE INSTRUCTIONS)


--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      1.8%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

      CO
--------------------------------------------------------------------------------



CUSIP NO.   410768 10 5
--------------------------------------------------------------------------------

1.   NAMES OF REPORTING PERSONS.
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

     Schlumberger Oilfield Holdings Ltd.
--------------------------------------------------------------------------------

2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP(SEE INSTRUCTIONS)

     (a)
     (b)
--------------------------------------------------------------------------------
3.   SEC USE ONLY


--------------------------------------------------------------------------------
4.   SOURCE OF FUNDS(SEE INSTRUCTIONS) OO


--------------------------------------------------------------------------------
5.   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)


--------------------------------------------------------------------------------
6.   CITIZENSHIP OR PLACE OF ORGANIZATION

     CAYMAN ISLANDS
--------------------------------------------------------------------------------
               7    SOLE VOTING POWER

  NUMBER OF            366,158
   SHARES      -----------------------------------------------------------------
BENEFICIALLY   8    SHARED VOTING POWER
  OWNED BY
    EACH                 0
 REPORTING     -----------------------------------------------------------------
   PERSON      9    SOLE DISPOSITIVE POWER
    WITH
                       366,158
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER

                         0
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      366,158
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
     (SEE INSTRUCTIONS)


--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      0.5%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

      CO
--------------------------------------------------------------------------------



CUSIP NO.   410768 10 5
--------------------------------------------------------------------------------

1.   NAMES OF REPORTING PERSONS.
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

     Camco International Inc.   13-3517570
--------------------------------------------------------------------------------

2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP(SEE INSTRUCTIONS)

     (a)
     (b)
--------------------------------------------------------------------------------
3.   SEC USE ONLY


--------------------------------------------------------------------------------
4.   SOURCE OF FUNDS(SEE INSTRUCTIONS) OO


--------------------------------------------------------------------------------
5.   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)


--------------------------------------------------------------------------------
6.   CITIZENSHIP OR PLACE OF ORGANIZATION

     DELAWARE
--------------------------------------------------------------------------------
               7    SOLE VOTING POWER

  NUMBER OF            6,762,479
   SHARES      -----------------------------------------------------------------
BENEFICIALLY   8    SHARED VOTING POWER
  OWNED BY
    EACH                 0
 REPORTING     -----------------------------------------------------------------
   PERSON      9    SOLE DISPOSITIVE POWER
    WITH
                       6,762,479
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER

                         0
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      6,762,479
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
     (SEE INSTRUCTIONS)


--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      8.5%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

      CO
--------------------------------------------------------------------------------




CUSIP NO.   410768 10 5
--------------------------------------------------------------------------------

1.   NAMES OF REPORTING PERSONS.
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

     Operational Services, Inc.   76-0313484
--------------------------------------------------------------------------------

2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP(SEE INSTRUCTIONS)

     (a)
     (b)
--------------------------------------------------------------------------------
3.   SEC USE ONLY


--------------------------------------------------------------------------------
4.   SOURCE OF FUNDS(SEE INSTRUCTIONS) OO


--------------------------------------------------------------------------------
5.   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)


--------------------------------------------------------------------------------
6.   CITIZENSHIP OR PLACE OF ORGANIZATION

     TEXAS
--------------------------------------------------------------------------------
               7    SOLE VOTING POWER

  NUMBER OF            97,261
   SHARES      -----------------------------------------------------------------
BENEFICIALLY   8    SHARED VOTING POWER
  OWNED BY
    EACH                 0
 REPORTING     -----------------------------------------------------------------
   PERSON      9    SOLE DISPOSITIVE POWER
    WITH
                       97,261
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER

                         0
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      97,261
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
     (SEE INSTRUCTIONS)


--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      0.1%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

      CO
--------------------------------------------------------------------------------



CUSIP NO.   410768 10 5
--------------------------------------------------------------------------------

1.   NAMES OF REPORTING PERSONS.
     I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

     Schlumberger Limited
--------------------------------------------------------------------------------

2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP(SEE INSTRUCTIONS)

     (a)
     (b)
--------------------------------------------------------------------------------
3.   SEC USE ONLY


--------------------------------------------------------------------------------
4.   SOURCE OF FUNDS(SEE INSTRUCTIONS) OO


--------------------------------------------------------------------------------
5.   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
     PURSUANT TO ITEMS 2(d) OR 2(e)


--------------------------------------------------------------------------------
6.   CITIZENSHIP OR PLACE OF ORGANIZATION

     NETHERLANDS ANTILLES
--------------------------------------------------------------------------------
               7    SOLE VOTING POWER

  NUMBER OF            0
   SHARES      -----------------------------------------------------------------
BENEFICIALLY   8    SHARED VOTING POWER
  OWNED BY
    EACH               0
 REPORTING     -----------------------------------------------------------------
   PERSON      9    SOLE DISPOSITIVE POWER
    WITH
                       0
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER

                       0
--------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      8,707,693
--------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
     (SEE INSTRUCTIONS)


--------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      11.0%
--------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

      CO
--------------------------------------------------------------------------------



ITEM 1.  SECURITY OF ISSUER

This statement on Schedule 13-D relates to common stock, par value $.001 per
share, of Hanover Compressor Company (the "Hanover Stock") and is being filed
pursuant to Rule 13d-1 under the Securities and Exchange Act of 1934, as
amended. The principal executive offices of the Issuer is located at 12001 North
Houston Rosslyn, Houston, Texas 77806.


ITEM 2.  IDENTITY AND BACKGROUND

The name of the reporting persons filing this statement are Schlumberger
Limited, a company incorporated in the Netherlands Antilles ("SLB"),
Schlumberger Technology Corporation, a company incorporated in Texas ("STC"),
Camco International, Inc., a company incorporated in Delaware ("CII"),
Schlumberger Surenco S.A., a company incorporated in Panama ("Surenco"),
Operational Services, Inc., a Company incorporated in Texas ("OSI"), and
Schlumberger Oilfield Holdings Ltd., a company incorporated in the British
Virgin Islands ("SOHL," and together with SLB, STC, CII, Surenco and OSI, the
"Schlumberger Companies"). SLB owns, directly or indirectly, all of the equity
interests of each of STC, CII, Surenco, OSI and SOHL and thus may be deemed to
beneficially own all of the Hanover Stock owned by the other Schlumberger
Companies. The directors and executive officers of each of SLB, STC, CII,
Surenco, OSI and SOHL are set forth on Schedule I hereto.

The address for the principal executive offices of the Schlumberger Companies
are as follows:

            153 East 53rd Street, 57th Floor
            New York, New York  10022

            42 Rue Saint-Dominique
            Paris, France  75007

            Park Straat 83
            The Hague, The Netherlands  2514 JG

The principal business of the Schlumberger Companies is to engage, directly or
indirectly, in two primary business segments: (i) Oilfield Services, which is
organized into two product groups: (a) Reservoir Evaluation and Development and
(b) Schlumberger Oil and Gas Information Solutions that provide exploration and
production services required during the life of an oil and gas reservoir to the
petroleum industry; and (ii) Schlumberger Sema, which provides design,
implementation, operations and management of information systems and IT-related
consulting services, smart card-based solutions, semiconductor test, metrology
and handling systems and services, and corporate IP (internet protocol) and
network solutions to customers.

During the past five years, none of SLB, STC, CII, Surenco, OSI and SOHL or, to
the best of their knowledge, any of the persons listed on Schedule I hereto, (i)
has been convicted in a criminal proceeding (excluding traffic violations or
similar misdemeanors), or (ii) has been a party to a civil proceeding of a
judicial or administrative body of competent jurisdiction that resulted in a
judgment decree or final order enjoining future violations of, or prohibiting or
mandating any activities subject to, federal or state securities laws or finding
any violation of such laws except as follows:

On July 27, 1999, the US Department of Justice filed petitions against SLB and
Smith International, Inc., with the United States District Court in Washington,
D.C., alleging civil and criminal contempt in connection with the completion of
the MI drilling fluids joint venture transaction between SLB and Smith. The
petitions alleged that the transaction violated a 1994 consent decree entered in
U.S. v. Baroid Corporation (the "Baroid decree"). On December 9, 1999, SLB,
Smith and the Department of Justice agreed to settle the civil contempt claim.
The Court subsequently found Smith and SLB in criminal contempt and fined each
$750,000. The December 22, 1999 order approving the civil settlement agreement
provides for the modification of the Baroid decree, with the consent of the
Department of Justice, to remove the reference to "Schlumberger Ltd." from the
Baroid decree, and for disgorgment of the net income of the joint venture from
the time of its creation through the date of the settlement agreement. SLB's
share of the amount payable in connection with the settlement was $6.34 million.
On March 13, 2000, following expiration of a public comment period regarding the
proposed modification, the Court signed the order modifying the Baroid decree.



The attached Schedule I is a list of the executive officers and directors of
SLB, STC, CII, Surenco, OSI and SOHL which contain the following information
with respect to each such person: (i) name, (ii) business address, (iii) present
principal occupation or employment and the name, principal business address and
address of any corporation or other organization in which such employment is
conducted, and (iv) citizenship.


ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

On June 28, 2001, the Issuer, Hanover Compression Limited Partnership, STC, CII,
Surenco and SOHL entered into a Purchase Agreement (the "Purchase Agreement"),
pursuant to which on August 31, 2001, the Issuer acquired equity interests in
certain companies engaged in, and assets used in connection with, the gas
compression business of the Schlumberger group of companies. Hanover Compression
Limited Partnership acquired: (i) 100% of the issued and outstanding shares of
the capital stock of Productions Operators Corporation, a Delaware corporation,
from CII, (ii) a 35.5% equity interest in and a $7,952,000 note to Harwat
International Finance N.V., a Curacao limited liability company, from SOHL (iii)
a 30% equity interest in and a $79,185,000 loan to WilPro Energy Service (PIGAP
II) Limited, a Cayman Islands company, from Surenco and (iv) the assets of
Operational Services, Inc.'s Mechanical Services Group ((i) through (iv) is
referred to herein as the "Purchase"). In addition, pursuant to the Purchase
Agreement, STC, SOHL and Hanover Compression Limited Partnership entered into an
Alliance Agreement.

The purchase price paid by Hanover for the assets and the Alliance Agreement
consisted of (i) Two Hundred Seventy Million Dollars ($270,000,000) in cash
(subject to certain true up provisions and a possible additional $58,000,000
payment upon the occurrence of certain events), (ii) a promissory note in the
principal amount of One Hundred Fifty Million Dollars ($150,000,000), and (iii)
8,707,693 shares of Hanover Stock.


ITEM 4.  PURPOSE OF TRANSACTION

The shares of Hanover Stock received by the Schlumberger Companies were acquired
as partial consideration for certain equity interests of companies engaged in,
assets used in connection with, and an Alliance Agreement related to the gas
compression business conducted by the Schlumberger Companies. The shares of
Hanover Stock are being held for investment purposes by the Schlumberger
Companies.

It is currently expected that following the consummation of the Purchase, the
business and operations of Hanover will continue to be conducted as they have
historically been conducted. Except as described below, the Schlumberger
Companies have no present plans or proposals that would result in any
extraordinary corporate transaction, such as a merger, reorganization,
liquidation involving Hanover or any of its subsidiaries, or purchase or sale or
transfer of a material amount of assets of Hanover or any of its subsidiaries or
any other material changes to Hanover's capitalization, dividend policy,
corporate structure, business or composition of the board of directors of
Hanover or the management of Hanover. Pursuant to the Purchase Agreement, the
Schlumberger Companies are entitled to appoint one director to the Board of
Directors of Hanover until the later to occur of (i) the fifth anniversary of
the consummation of the Purchase Agreement and (ii) the termination of the
Alliance Agreement, so long as the Schlumberger Companies hold an aggregate of
at least five percent (5%) of Hanover's issued and outstanding capital stock. If
the Schlumberger Companies' designee is not elected to Hanover's Board of
Directors, Hanover shall take all actions necessary, subject to applicable laws
and New York Stock Exchange rules, to appoint a designee of the Schlumberger
Companies.

The Schlumberger Companies intend to review continuously their position in
Hanover. Depending upon future evaluations of the business prospects of Hanover
and upon other developments, including, but not limited to, general economic and
business conditions and stock market conditions, the Schlumberger Companies may
retain or from time to time increase their holdings or dispose of all or a
portion of their holdings of Hanover, subject to any applicable legal and
contractual restrictions on the ability to do so. The Schlumberger Companies are
contractually prohibited, except upon the occurrence of certain events, from (i)
selling their shares of Hanover Stock prior to June 28, 2004 or (ii) increasing
their collective holdings of Hanover Stock to more than 25% outstanding shares
during such period.



ITEM 5.  INTEREST IN SECURITIES OF ISSUER

(A) On August 31, 2001, the Schlumberger Companies acquired an aggregate of
8,707,693 shares of Hanover Stock in the Purchase. The holdings of the
individual Schlumberger Companies are as follows:

                  COMPANY               SHARES            PERCENTAGE
                  -------               ------            ----------

                    STC                  51,491                 *%
                    CII               6,762,479               8.5%
                    Surenco           1,430,304               1.8%
                    SOHL                366,158               0.5%
                    OSI                  97,261               0.1%

                    Total             8,707,693              10.9%

*  Less than 0.1%

SLB, as the direct or indirect owner of all of the other Schlumberger Companies,
may be deemed to beneficially own all 8,707,693 shares of Hanover Stock owned by
the Schlumberger Companies.

(B) Each of the Schlumberger Companies (other than SLB) has sole voting and
dispositive power with respect to the number of shares of Hanover Stock set
forth opposite its name in the table above.

(C) Except as described herein, none of SLB, STC, CII, Surenco, OSI or SOHL or,
to the best of their knowledge, any other person referred to in Schedule I
attached hereto, beneficially owns or has acquired or disposed of any Hanover
Stock during the past 60 days.

(D)   Not applicable.

(E)   Not applicable.


ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO
SECURITIES OF THE ISSUER

Except as described herein, none of SLB, STC, CII, Surenco, OSI or SOHL or, to
the best of their knowledge, any other person referred to in Schedule I attached
hereto, has any contracts, arrangements, understandings or relationships (legal
or otherwise) with any persons with respect to any securities of Issuer,
including, but not limited to, transfers or voting of any securities, finders
fees, joint ventures, loan or option arrangements, puts or calls, guarantees of
profits, division of profits or loss, or the giving or withholding of any
proxies.

1. Registration Rights Agreement

Pursuant to the Lock-Up, Standstill and Registration Rights Agreement dated
August 31, 2001, between STC, CII, Surenco, SOHL, OSI and Hanover (the "Rights
Agreement"), Hanover has granted to each of the Schlumberger Companies certain
registration rights in connection with their receipt of the Hanover Stock. The
registration rights granted to the Schlumberger Companies include (i) the right,
subject to certain restrictions, to register the Hanover Stock in any
registration of securities initiated by Hanover within the period of time
beginning on the third anniversary of the date of the Rights Agreement and
ending on the tenth anniversary of the date of the Rights Agreement, and (ii)
the right, subject to certain restrictions, to demand up to five registrations
of the Hanover Stock within the period of time beginning on the third
anniversary of date of the Rights Agreement and ending on the tenth anniversary
of the date of the Rights Agreement.



Also pursuant to the Rights Agreement, neither STC nor any of its affiliates
will directly or indirectly, offer, sell, contract to sell, pledge, grant any
option to purchase, make any short sale or otherwise dispose of any of the
Hanover Stock or any options or warrants to purchase any Hanover Stock , or any
securities convertible into, exchangeable for or that represent the right to
receive such Hanover Stock beginning on the date of the Rights Agreement through
the tenth anniversary of the date of the Rights Agreement.

In addition, the Rights Agreement specifies that neither STC nor any of its
affiliates shall, without the prior written consent of Hanover, (i) seek or
cause or participate in any transaction which would cause STC and its affiliates
to own, directly or indirectly, greater than twenty-five percent (25%) of the
shares of Common Stock of Hanover then outstanding, (ii) make any public
announcement with respect to, or submit a proposal for, any extraordinary
transaction involving Hanover, (iii) form or join in any group with respect to
the matters set forth in (i) above, or (iv) enter into discussions or
arrangements with any third party with respect to matters set forth in (i) or
advise assist other take any other action with respect to the foregoing.

2. The Purchase Agreement

Pursuant to the Purchase Agreement, Hanover Compression Limited Partnership and
Hanover have agreed to use commercially reasonable efforts to cause WilPro
Energy Services (PIGAP II) Limited to accomplish substantial completion of the
project in accordance with the PIGAP II Services Agreement, dated as of April
16, 1999 between PDVSA PETROLEO Y GAS S.A. and WilPro Energy Services (PIGAP II)
Limited, and any tests necessary for the PIGAP II financing to become
non-recourse to Hanover and its affiliates on or before December 31, 2002. If
such conditions are not met on or prior to December 31, 2002, Hanover
Compression Limited Partnership may force Surenco to repurchase the equity
interest and note purchased from Surenco.


ITEM 7. MATERIALS TO BE FILED AS EXHIBITS

The following documents are hereby filed as exhibits:

1.    Purchase Agreement dated June 28 2001, by and among Schlumberger
      Technology Corporation, Schlumberger Oilfield Holdings Limited,
      Schlumberger Surenco S.A., Camco International Inc., Hanover Compressor
      Company and Hanover Compression Limited Partnership.*

2.    Lock-Up, Standstill and Registration Rights Agreement dated August 31,
      2001, by and among Schlumberger Technology Corporation, Schlumberger
      Oilfield Holdings Limited, Schlumberger Surenco S.A., Camco International,
      Inc. and Hanover Compressor Company.*

3.    Amendment No. 1 to the Purchase Agreement dated as of August 30, 2001, by
      and among Schlumberger Technology Corporation, Schlumberger Oilfield
      Holdings Limited, Schlumberger Surenco S.A., Camco International Inc.,
      Hanover Compressor Company and Hanover Compression Limited Partnership.*

*     Previously filed with the original Schedule 13D on September 10, 2001.



                                   SCHEDULE I
                        DIRECTORS AND EXECUTIVE OFFICERS
                          OF THE SCHLUMBERGER COMPANIES


Set forth below is the name and present principal occupation or employment of
each executive officer and member of the board of directors of each of the
Schlumberger Companies. The business address for each company is listed below.




NAME AND POSITION             PRESENT PRINCIPAL OCCUPATION OR EMPLOYMENT          CITIZENSHIP

                                                                              
SLB                           MAILING ADDRESS:  SCHLUMBERGER LIMITED
                                                153 EAST 53RD
                                                STREET 57TH FLOOR
                                                NEW YORK, NY 10022-4624

   DIRECTORS

   Don E. Ackerman            Private Investor.  Mr. Ackerman's current                U.S.A.
                              business address is Chandelle Ventures, Inc.,
                              24311 Walden Center Drive, Bonita Springs, FL
                              34134.

   D. Euan Baird              Chairman of the Board and Chief Executive                U.K.
                              Officer of Schlumberger Limited.  Mr. Baird is
                              also currently a director of ScottishPower
                              Plc.,Societe Generale Group, CEA-Industrie and
                              a trustee of Haven Capital Management Trust.

   John Deutch                Institute Professor, Massachusetts Institute of          U.S.A.
                              Technology, Cambridge, Massachusetts. Mr.
                              Deutch is also a director of Citigroup, CMS
                              Energy Corp., Cummins Engine Company Inc.,
                              ARIAD Pharmaceuticals and Raytheon Corporation.
                              Mr. Deutch's current business address is
                              Massachusetts Institute of Technology, Room
                              6-208, 77 Massachusetts Avenue, Cambridge, MA
                              02139.

   Victor E. Grijalva         Vice Chairman  of Schlumberger Limited.  Mr.             Ecuador
                              Grijalva is also currently Chairman of the
                              Board of Directors of Transocean Sedco Forex, Inc.

   Andre Levy-Lang            Private Investor.  Mr. Levy-Lang is also a               France
                              director and member of the compensation
                              committee of AGF and a director of Dexia.
                              Mr. Levy-Lang's current business address is 23,
                              boulevard Jules Sandeau, 75116, Paris, France.

   John C. Mayo               Private Investor.                                         U.K.

   William T. McCormick, Jr.  Chairman and Chief Executive Officer of CMS               U.S.A.
                              Energy Corp., Dearborn, Michigan.  Mr.
                              McCormick is also a director of Bank One, Inc.
                              and Rockwell International Inc.
                              Mr. McCormick's current business address is CMS
                              Energy Corporation, Fairlane Plaza South, 330
                              Town Center Drive, Suite 1100, Dearborn, MI
                              48126.

   Didier Primat              President of Primwest Holdings N.V., Curacao,             France
                              Netherlands Antilles.  Mr. Primat's current
                              business address is PRIMWEST, 210 Route de
                              Jussy, CH-1243 Presinge/Geneva, Switzerland.







                                                                                
   Nicolas Seydoux            Chairman and Chief Executive Officer of                   France
                              Gaumont, Paris, France.  Mr. Seydoux's current
                              business address is 30, Avenue Charles de
                              Gaulle, 92200, Neuilly-sur-Seine, France.

   Linda Gillespie Stuntz     Partner of the law firm Stuntz, Davis &                   U.S.A.
                              Staffer, P.C., Washington, D.C.  Ms. Stuntz is
                              also a director of American Electric Power
                              Company, Inc., and is chairman of its finance
                              committee and a member of its Executive,
                              Directors and Public Policy Committees.
                              Ms. Stuntz's current business address is
                              Stuntz, Davis & Staffier P.C., 1275
                              Pennsylvania Avenue, N.W., 9th Floor,
                              Washington, D.C., 20004.

   Sven Ullring               Independent Advisor, Hovik, Norway.  Mr.                  Norway
                              Ullring also currently serves as the Chairman
                              of the Supervisory Boards of Norsk Hydro and
                              Storebrand and a member of the supervisory
                              board of ABB Norway.  Mr. Ullring is also a
                              member of the Board of Keppel Corporation  in
                              Singapore, Chairman of the Board of the
                              Foundation for Business and Sustainable
                              Development and Chairman of the Norweigian Oil
                              Industries Forum in Oslo Norway.  Mr. Ullring's
                              current business address is Elisenbergvn. 5, 6
                              etg., N-0265, Oslo, Norway.

   Yoshihiko Wakumoto         Executive Director of the Japan Foundation                Japan
                              Center for Global Partnership.  Mr. Wakumoto's
                              current business address is  The Japan
                              Foundation Center for Global Partnership, ARK
                              Mori Bldg. 20F, 1-12-32 Akssaka, Minato-ku,
                              Tokyo 107-6021, Japan




EXECUTIVE OFFICERS
------------------

      D. Euan Baird           Chairman of the Board and Chief Executive Officer          U.K.

      Pierre E. Bismuth       Vice President, Personnel                                  France

      Mark Danton             Vice President, Director of Taxes                          U.K.

      Andrew Gould            Executive Vice President, Oilfield Services                U.K.

      Victor Grijalva         Vice Chairman                                              Ecuador

      James L. Gunderson      Secretary and General Counsel                              U.S.

      Phillipe Lacour-Gayet   Vice President and Chief Scientist                         France

      Jack Liu                Executive Vice President and Chief Financial
                              Officer C                                                  U.S.A.
      Jean-Dominique
       Percevault             Vice President, European Affairs                           France

      Jean-Marc Perraud       Controller and Chief Accounting Officer                    France







                                                                                   
      Irwin Pfister           Executive Vice President, SchlumbergerSema                 U.S.A.

      Michel Soublin          Treasurer                                                  France

                              MAILING ADDRESS: SCHLUMBERGER TECHNOLOGY CORPORATION
 STC                                           300 SCHLUMBERGER DRIVE
                                               SUGAR LAND, TX 77478

      DIRECTORS
      ---------

      David S. Browning       VP, Secretary & General Counsel                             U.S.A.

      Gary Kolstad            OFS GeoMarket Manager, US Land                              U.S.A.

      Arthur Lindenauer       Chairman, STC                                               U.S.A.

      Rex Ross                President, North & Central America
                              SchlumbergerSema                                            U.S.A.

      OFFICERS
      --------

      Arthur Lindenauer       Chairman, STC                                               U.S.A.

      Vacancy                 President                                                   N/A

      David S. Browning       Vice President                                              U.S.A.

      Roseline Chapel-Delayne Vice President and Controller                               France/USA

      Peter A. Goode          Vice President                                              Australia

      Gary Kolstad            Vice President                                              U.S.A.

      David Mullen            Vice President                                              Ireland

      Julio M. Quintana       Vice President                                              U.S.A.

      William Coates          VP & GM Austin Tech Center                                  U.S.A.

      Sophie Zurquiyah
       Rousset                VP & GM Sch Conveyance & Delivery                           U.S.A./ France

      Francois Auzerais       VP & GM Sch Doll Research Center                            France

      Joe Goss                VP Sch Reservoir Completions Center                         U.S.A.

      David Malone            VP Sch Reservoir Completions Center                         U.S.A.

      Stuart Jardine          VP Sugar Land Product Center                                UK

      Tom Zimmerman           VP Sugar Land Product Center                                U.S.A.

      David S. Browning       Secretary                                                   U.S.A.

      Terry D. Keller         Treasurer                                                   U.S.A.






                                                                                   
SURENCO
                              MAILING ADDRESS:  SCHLUMBERGER SURRENCO, S.A.
                              8 CALLE AQUILLINO DE LA GUARDIA
                              PANAMA CITY, REPUBLIC OF PANAMA
      DIRECTORS
      ---------

      Brendan Connolly        OFS GeoMarket Mgr. - VTT                                    U.K.

      Joseph Kantarjian       OFS GeoMarket Controller - VTT                              Lebanon/
                                                                                          Venezuela

      Orlando Vaca            VTT Personnel Mgr                                           Bolivia

      OFFICERS
      --------

      Brendan Connolly        President                                                   U.K.

      Orlando Vaca            Vice President                                              Bolivia

      Jean-Francois Bauer     Secretary                                                   France

      Joseph Kantarjian       Treasurer                                                   Lebanon/
                                                                                          Venezuela

  SOHL                        MAILING ADDRESS: SCHLUMBERGER OILFIELD HOLDINGS LIMITED
                                               CRAIGMUIR CHAMBERS, P.O. BOX 71
                                               ROAD TOWN, TORTOLA, BVI

      DIRECTORS
      ---------

      Glen Beadon             Operations Mgr Anadrill - VTT                               Trinidad/
                                                                                          Venezuela

      Joseph Kantarjian       OFS GeoMarket Controller - VTT                              Lebanon/
                                                                                          Venezuela

      Khalid M. Nouh          Business Manager, Reservoir Evaluation                      Saudi Arabia

      OFFICERS
      --------

      Khalid M. Nouh          President                                                   Saudi Arabia

      Joseph Kantarjian       Treasurer                                                   Lebanon/
                                                                                          Venezuela

CII
---
                              MAILING ADDRESS: CAMCO INTERNATIONAL INC.
                                               7030 ADRMORE STREET
                                               HOUSTON, TX 77054

       DIRECTORS
       ---------

      David S. Browning       Vice President and Secretary & General Counsel
                              of STC                                                      U.S.A.

      Arthur Lindenauer       Chairman - STC                                              U.S.A.

      OFFICERS
      --------

      Rene J. Huck            President and Chief Executive Officer                       France

      Lias J. Steen           Vice President                                              U.S.A.

      John D. Deane           Vice President Drilling Technology                          U.S.A.






                                                                                   
      Lias J. Steen           Secretary & General Counsel                                 U.S.A.

      Allen Wienecke          Treasurer                                                   U.S.A.


 OSI                          MAILING ADDRESS:  OPERATIONAL SERVICES, INC.
-----                                           300 SCHLUMBERGER DRIVE
                                                SUGAR LAND, TX 77478
      DIRECTORS
      ---------

      Antonio Campo           President, IPM                                              Columbia

      Kenneth Trice           President, OSI                                              U.S.A.

      OFFICERS
      --------

      Kenneth Trice           President                                                   U.S.A.

      Antonio Campo           Vice President                                              Columbia

      Kenneth Trice           Secretary                                                   U.S.A.

      Ann Bruso Webb          Assistant Secretary                                         U.S.A.





SIGNATURE

      After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.




SCHLUMBERGER LIMITED                         SCHLUMBERGER OILFIELD HOLDINGS LTD.


By: /s/  VICTOR GRIJALVA                      By: /s/  JOSEPH KANTARJIAN
    --------------------------------              ----------------------
    Name:  Victor Grijalva                        Name:  Joseph Kantarjian
    Title: Vice Chairman                          Title: Director and Treasurer


SCHLUMBERGER TECHNOLOGY CORPORATION           SCHLUMBERGER SURENCO S.A.


By: /s/  PETER A. GOODE                       By: /s/  ORLANDO VACA
    --------------------------------              -----------------
    Name:  Peter A. Goode                         Name:  Orlando Vaca
    Title: Vice President                         Title:  Vice President


CAMCO INTERNATIONAL INC.                      OPERATIONAL SERVICES, INC.


By: /s/  LIAS J. STEEN                        By: /s/  KENNETH TRICE
    --------------------------------              ------------------
    Name:  Lias J. Steen                          Name:  Kenneth Trice
    Title: Vice President                         Title: President