NOBLE DRILLING CORP
10-K/A, 1998-06-29
DRILLING OIL & GAS WELLS
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<PAGE>   1
                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 10-K/A
                                 AMENDMENT NO. 1

[X]             ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF
              THE SECURITIES EXCHANGE ACT OF 1934 (NO FEE REQUIRED)


                   FOR THE FISCAL YEAR ENDED DECEMBER 31, 1997

[ ]           TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF
              THE SECURITIES EXCHANGE ACT OF 1934 (NO FEE REQUIRED)


           FOR THE TRANSITION PERIOD FROM ___________ TO _____________


                         COMMISSION FILE NUMBER: 0-13857


                           NOBLE DRILLING CORPORATION
             ------------------------------------------------------
             (Exact name of registrant as specified in its charter)

      DELAWARE                                          73-0374541
- ------------------------                 ---------------------------------------
(State of incorporation)                 (I.R.S. employer identification number)


             10370 RICHMOND AVENUE, SUITE 400, HOUSTON, TEXAS 77042
             ------------------------------------------------------
               (Address of principal executive offices) (Zip Code)


       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (713) 974-3131
       ------------------------------------------------------------------

           Securities registered pursuant to Section 12(b) of the Act:

COMMON STOCK, PAR VALUE $.10 PER SHARE           NEW YORK STOCK EXCHANGE
   9 1/8% SENIOR NOTES DUE 2006                  NEW YORK STOCK EXCHANGE
 PREFERRED STOCK PURCHASE RIGHTS                 NEW YORK STOCK EXCHANGE
- -------------------------------------- -----------------------------------------
      Title of each class              Name of each exchange on which registered

           Securities registered pursuant to Section 12(g) of the Act:
                                      NONE

         Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes [X] No [ ]

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

         Aggregate market value of Common Stock held by nonaffiliates as of
March 9, 1998: $3,557,930,459
         Number of shares of Common Stock outstanding as of March 9, 1998:
131,342,070

                       DOCUMENTS INCORPORATED BY REFERENCE

         Listed below are documents parts of which are incorporated herein by
reference and the part of this report into which the document is incorporated:


   (1) Proxy statement for the 1998 annual meeting of stockholders - Part III


<PAGE>   2





         Item 14 of Noble Drilling Corporation's Annual Report on Form 10-K for
the year ended December 31, 1997 (the "1997 Form 10-K") is amended to reflect
the filing herewith as new Exhibit 99.1 of the financial statements required by
Form 11-K for the fiscal year ended December 31, 1997 with respect to the Noble
Drilling Corporation 401(k) Savings Plan, and such Item 14 is restated as set
forth on the following page.

         The Index to Exhibits to the 1997 Form 10-K is restated in its entirety
following the signature page hereto in order to reflect the inclusion therein,
and the filing herewith, of Exhibit 99.1.

                                      


                                      -2-




<PAGE>   3



ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

         (a)      The following documents are filed as part of this report:

                  (1)      A list of the financial statements filed as a part of
                           this report is set forth in Item 8 on page 23 and is
                           incorporated herein by reference.

                  (2)      Financial Statement Schedules:

                           All schedules are omitted because either they are not
                           applicable or the required information is shown in
                           the financial statements or notes thereto.

                  (3)      Exhibits:

                           The information required by this Item 14(a)(3) is set
                           forth in the Index to Exhibits accompanying this
                           Annual Report on Form 10-K and is incorporated herein
                           by reference.

                  (4)      Financial Statements required by Form 11-K for the
                           fiscal year ended December 31, 1997, with respect to
                           the Noble Drilling Corporation 401(k) Savings Plan
                           are filed as Exhibit 99.1 hereto.

         (b)      No reports on form 8-K were filed by the Company during the 
                  quarter ended December 31, 1997.




                                      -3-



                                      
<PAGE>   4

                                 SIGNATURES

        Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Registrant has duly caused this report to be signed
on its behalf by the undersigned, thereunto duly authorized.



                                        NOBLE DRILLING CORPORATION



Date: June 26, 1998
                                        By:  /s/ JAMES C. DAY
                                           ------------------------------------
                                             James C. Day, Chairman, President
                                                and Chief Executive Officer




                                      -4-
<PAGE>   5



                                INDEX TO EXHIBITS
<TABLE>
<CAPTION>
EXHIBIT
NUMBER **                                                        EXHIBIT
- ---------------      ------------------------------------------------------------------------------------------------
 <S>                 <C>        
 2.1            -    Agreement of Sale and Purchase dated as of April 25, 1996 between the Registrant and Royal
                     Nedlloyd N.V. and Neddrill Holding B.V. (filed as Exhibit 2.1 to the Registrant's Registration
                     Statement on Form S-3 (No. 333-2927) and incorporated herein by reference).

 2.2            -    Asset Purchase Agreement dated November 15, 1996 by and between the Registrant, Noble
                     Properties, Inc. and Noble Drilling (Canada) Ltd. and Nabors Industries, Inc. (filed as
                     Exhibit 2.1 to the Registrant's Form 8-K dated dated December 27, 1996 (date of event:
                     December 13, 1996) and incorporated herein by reference).

 2.3            -    Agreement dated December 13, 1996 by and among the Registrant, Noble Properties, Inc., Noble
                     Drilling (Canada) Ltd., Noble Drilling (U.S.) Inc., and Noble Drilling Land Limited and Nabors
                     Industries, Inc., Nabors Drilling USA, Inc. and Nabors Drilling Limited (filed as Exhibit 2.2
                     to the Registrant's Form 8-K dated December 27, 1996 (date of event: December 13, 1996)  and
                     incorporated herein by reference).

 2.4            -    Asset Purchase Agreement dated as of February 19, 1997 between the Registrant, Noble Drilling
                     (U.S.) Inc., Noble Offshore Corporation, Noble Drilling (Mexico) Inc. and NN-1 Limited
                     Partnership and Pride Petroleum Services, Inc. (filed as Exhibit 2.10 in the Registrant's
                     Annual Report on Form 10-K for the year ended December 31, 1996 and incorporated herein by
                     reference.)

 2.5            -    Agreement dated April 10, 1997 by and between Noble Drilling Corporation, Noble Drilling
                     (U.S.) Inc., Noble Offshore Corporation, Noble Drilling (Mexico) Inc. and NN-1 Limited
                     Partnership, and Pride Petroleum Services, Inc. (filed as Exhibit 2.2 to the Registrant's
                     Form 8-K dated May 21, 1997 (date of event: May 7, 1997) and incorporated herein by reference).

 2.6            -    First Amendment to Asset Purchase Agreement dated as of May 7, 1997 by and between Noble
                     Drilling Corporation, Noble Drilling (U.S.) Inc., Noble Offshore Corporation, Noble Drilling
                     (Mexico) Inc., NN-1 Limited Partnership and Mexico Drilling Partners Inc., and Pride Petroleum
                     Services, Inc., Pride Offshore, Inc. and Forasol S.A. (filed as Exhibit 2.3 to the
                     Registrant's Form 8-K dated May 21, 1997 (date of event: May 7, 1997) and incorporated herein
                     by reference).

 3.1            -    Restated Certificate of Incorporation of the Registrant dated August 29, 1985 (filed as
                     Exhibit 3.7 to the Registrant's Registration Statement on Form 10 (No.  0-13857) and
                     incorporated herein by reference).

 3.2            -    Certificate of Amendment of Restated Certificate of Incorporation of the Registrant dated May
                     5, 1987 (filed as Exhibit 4.2 to the Registrant's Registration Statement on Form S-3 (No.
                     33-67130) and incorporated herein by reference).
</TABLE>




                                      -5-






                                      
<PAGE>   6





<TABLE>
<CAPTION>
EXHIBIT
NUMBER**                                                         EXHIBIT
- ---------------      ------------------------------------------------------------------------------------------------
 <S>                 <C>        
 3.3            -    Certificate of Amendment of Certificate of Incorporation of the Registrant dated July 31, 1991
                     (filed as Exhibit 3.16 to the Registrant's Annual Report on Form 10-K for the year ended
                     December 31, 1991 and incorporated herein by reference).

 3.4            -    Certificate of Amendment of Certificate of Incorporation of the Registrant dated September 15,
                     1994 (filed as Exhibit 3.1 to the Registrant's Quarterly Report on Form 10-Q for the
                     three-month period ended March 31, 1995 and incorporated herein by reference).

 3.5            -    Certificate of Designations of Series A Junior Participating Preferred Stock, par value $1.00
                     per share, of the Registrant dated as of June 29, 1995 (filed as Exhibit 3.2 to the
                     Registrant's Quarterly Report on Form 10-Q for the three-month period ended June 30, 1995 and
                     incorporated herein by reference).

 3.6            -    Certificate of Amendment of Certificate of Designations of Series A Junior Participating 
                     Preferred Stock of Registrant dated September 5, 1997.

 3.7            -    Composite copy of the Bylaws of the Registrant as currently in effect.

 3.8            -    Amendment of Articles IV and VI of the Bylaws of the Registrant adopted January 29, 1998.

 4.1            -    Indenture dated as of October 1, 1993 governing the 9 1/4% Senior Notes due 2003 (filed as
                     Exhibit 4.1 to the Registrant's Quarterly Report on Form 10-Q for the three-month period ended
                     September 30, 1993 and incorporated herein by reference).

 4.2            -    First Supplemental Indenture dated as of May 30, 1997 to Indenture dated as of October 1, 1993
                     governing the 9 1/4% Senior Notes due 2003.

 4.3            -    Indenture dated as of July 1, 1996 governing the 9 1/8% Senior Notes due 2006 (including form
                     of Note) (filed as Exhibit 4.1 to the Registrant's Form 8-K dated July 16, 1996 (date of
                     event: July 1, 1996) and incorporated herein by reference).

 4.4            -    Credit Agreement, dated as of August 14, 1997, among Noble Drilling Corporation, the lending
                     institutions listed from time to time on Annex I thereto, Credit Lyonnais New York Branch, as
                     Documentation Agent and Christiania Bank Og Kreditkasse ASA, New York Branch, as Arranger and
                     Administrative Agent.

 4.5            -    Rights Agreement dated as of June 28, 1995 between the Registrant and Liberty Bank and Trust
                     Company of Oklahoma City, N.A.  (filed as Exhibit 4 to the Registrant's Form 8-K dated June
                     29, 1995 (date of event: June 28, 1995) and incorporated herein by reference).
</TABLE>




                                      -6-



<PAGE>   7




<TABLE>
<CAPTION>
EXHIBIT
NUMBER**                                                         EXHIBIT
- ---------------      ------------------------------------------------------------------------------------------------
 <S>                 <C>        
 4.6            -    Amendment No. 1 to Rights Agreement, dated September 3, 1997, between Noble Drilling
                     Corporation and Liberty Bank and Trust Company of Oklahoma City, N.A. (filed as Exhibit 4.2 to
                     the Registrant's Form 8-A/A (Amendment No. 1) dated September 3, 1997 and incorporated herein
                     by reference).

 4.7            -    Summary of Rights to Purchase Preferred Shares, as amended as of September 3, 1997 to conform
                     with Amendment No. 1 to Rights Agreement, dated September 3, 1997 (filed as Exhibit 4.3 to the
                     Registrant's Form 8-K dated September 3, 1997 (date of event: September 3, 1997) and
                     incorporated herein by reference).

10.1            -    Assets Purchase Agreement dated as of August 20, 1993 (the "Portal Assets Purchase
                     Agreement"), between the Registrant and Portal Rig Corporation (filed as Exhibit 2.3 to the
                     Registrant's Registration Statement on Form S-3 (No.  33-67130) and incorporated herein by
                     reference).

10.2            -    Agreement dated as of October 25, 1993, among the Registrant, Noble (Gulf of Mexico) Inc.  and
                     Portal Rig Corporation, amending the Portal Assets Purchase Agreement (filed as Exhibit 2.5 to
                     the Registrant's Quarterly Report on Form 10-Q for the three-month period ended September 30,
                     1993 and incorporated herein by reference).

10.3            -    Amended and Restated Letter of Credit Agreement, dated as of October 25, 1993, among Portal
                     Rig Corporation, Noble (Gulf of Mexico) Inc., NationsBank of Texas, N.A., as agent and as one
                     of the "Banks" thereunder, and Marine Midland Bank, N.A., Bank of America National Trust and
                     Savings Association, and Norwest Bank Minnesota, National Association (collectively, the
                     "Banks") (filed as Exhibit 10.1 to the Registrant's Quarterly Report on Form 10-Q for the
                     three-month period ended September 30, 1993 and incorporated herein by reference).

10.4            -    Assignment, Assumption and Amended and Restated Preferred Ship Mortgage, dated October 25,
                     1993, by Noble (Gulf of Mexico) Inc.  to the Banks (filed as Exhibit 10.2 to the Registrant's
                     Quarterly Report on Form 10-Q for the three-month period ended September 30, 1993 and
                     incorporated herein by reference).

10.5            -    Security Agreement and Assignment, dated October 25, 1993, by Noble (Gulf of Mexico) Inc.  to
                     the Banks (filed as Exhibit 10.3 to the Registrant's Quarterly Report on Form 10-Q for the
                     three-month period ended September 30, 1993 and incorporated herein by reference).

10.6            -    Noble Support Agreement, dated October 25, 1993, among the Registrant and the Banks (filed as
                     Exhibit 10.4 to the Registrant's Quarterly Report on Form 10-Q for the three-month period
                     ended September 30, 1993 and incorporated herein by reference).

10.7            -    Stock Purchase Agreement dated April 22, 1994 among Joseph E.  Beall, George H.  Bruce, Triton
                     Engineering Services Company and the Registrant (filed as Exhibit 2.1 to the Registrant's Form
                     8-K dated May 6, 1994 (date of event: April 22, 1994) and incorporated herein by reference).
</TABLE>




                                      -7-



<PAGE>   8



<TABLE>
<CAPTION>
EXHIBIT
NUMBER**                                                         EXHIBIT
- ---------------      ------------------------------------------------------------------------------------------------
 <S>                 <C>        
10.8            -    Employment Agreement dated April 22, 1994 between Triton Engineering Services Company and
                     Joseph E. Beall (filed as Exhibit 10.2 to the Registrant's Form 8-K dated May 6, 1994 (date of
                     event: April 22, 1994) and incorporated herein by reference).

10.9*           -    Noble Drilling Corporation 1987 Stock Option Plan (filed as  Exhibit 10.7 to the Registrant's
                     Annual Report on Form 10-K for the year ended December 31, 1986, as amended, and incorporated
                     herein by reference).

10.10*          -    Noble Drilling Corporation 1991 Stock Option and Restricted Stock Plan (as amended and restated
                     on January 30, 1997, filed as Exhibit 10.2 to the Registrant's Annual Report on Form 10-K for the
                     year ended December 31, 1996 and incorporated herein by reference).

10.11*          -    Noble Drilling Corporation 1992 Nonqualified Stock Option Plan for Non-Employee Directors (filed 
                     as Exhibit 4.1 to the Registrant's Registration Statement on Form S-8 (No. 33-62394) and incorporated
                     herein by reference).

10.12*          -    Amendment No. 1 to the Noble Drilling Corporation 1992 Nonqualified Stock Option Plan for Non-Employee
                     Directors dated as of July 28, 1994 (filed as Exhibit 10.44 to the Registrant's Annual Report on 
                     Form 10-K for the year ended December 31, 1994 and incorporated herein by reference).

10.13*          -    Noble Drilling Corporation Equity Compensation Plan for Non-Employee Directors (filed as
                     Exhibit 10.1 to the Registrant's Quarterly Report on Form 10-Q for the three-month period
                     ended September 30, 1996 and incorporated herein by reference).

10.14*          -    Noble Drilling Corporation Short-Term Incentive Plan (revised July 1997).

10.15*          -    Noble Drilling Corporation Amended and Restated Thrift Restoration Plan (filed as Exhibit
                     10.46 to the Registrant's Annual Report on Form 10-K for the year ended December 31, 1994 and
                     incorporated herein by reference).

10.16*          -    Amendment No. 1 to the Noble Drilling Corporation Amended and Restated Thrift Restoration Plan
                     dated January 29, 1998.

10.17*          -    Noble Drilling Corporation Retirement Restoration Plan dated April 27, 1995 (filed as Exhibit
                     10.2 to the Registrant's Quarterly Report on Form 10-Q for the three-month period ended March
                     31, 1995 and incorporated herein by reference).

10.18*          -    Amendment No. 1 to the Noble Drilling Corporation Retirement Restoration Plan dated January
                     29, 1998.
</TABLE>




                                      -8-



<PAGE>   9




<TABLE>
<CAPTION>
EXHIBIT
NUMBER**                                                           EXHIBIT
- ---------------      ------------------------------------------------------------------------------------------------
 <S>                 <C>        

10.19*          -    Form of Indemnity Agreement entered into between the Registrant and each of the Registrant's
                     directors and bylaw officers (filed as Exhibit 10.46 to the Registrant's Annual Report on Form
                     10-K for the year ended December 31, 1995 and incorporated herein by reference).

10.20           -    Guarantee dated August 26, 1994 between the Registrant and Hibernia Management and Development
                     Company Ltd.  (filed as Exhibit 10.45 to the Registrant's Annual Report on Form 10-K for the
                     year ended December 31, 1994 and incorporated herein by reference).

10.21           -    Registration Rights Agreement dated as of July 1, 1996 between the Registrant and Royal
                     Nedlloyd N.V. (filed as Exhibit 10.25 to the Registrant's Annual Report on Form 10-K for the
                     year ended December 31, 1996 and incorporated herein by reference).

21.1            -    Subsidiaries of the Registrant.

23.1            -    Consent of Price Waterhouse LLP.

27.1                 Financial Data Schedule.

99.1***         -    Financial Statements required by Form 11-K for the fiscal year ended December 31, 1997 with 
                     respect to the Noble Drilling Corporation 401(k) Savings Plan (including consent of Price 
                     Waterhouse LLP regarding the incorporation by reference thereof).
</TABLE>

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

*        Management contract or compensatory plan or arrangement required to 
         be filed as an exhibit hereto.

**       Filed previously, unless otherwise indicated.

***      Filed herewith.




                                      -9-

<PAGE>   1
                                                                    EXHIBIT 99.1


                           NOBLE DRILLING CORPORATION
                               401(k) SAVINGS PLAN

                            FINANCIAL STATEMENTS AND
                             ADDITIONAL INFORMATION

                           DECEMBER 31, 1997 AND 1996



<PAGE>   2



NOBLE DRILLING CORPORATION 401(k) SAVINGS PLAN
INDEX TO FINANCIAL STATEMENTS AND ADDITIONAL INFORMATION
- -------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                                                            PAGE
<S>                                                                                                         <C>
Report of Independent Accountants                                                                             1

Financial Statements:

     Statements of net assets available for benefits at December 31, 1997 and 1996                            2

     Statements of changes in net assets available for benefits for the years ended
       December 31, 1997 and 1996                                                                             3

     Notes to financial statements                                                                          4 - 13

Additional Information*:

     Form 5500 - Item 27(a) - Schedule of assets held for investment purposes
       at December 31, 1997 (Schedule I)                                                                     14

     Form 5500 - Item 27(b) - Schedule of loans or fixed income obligations
       at December 31, 1997 (Schedule II)                                                                    15

     Form 5500 - Item 27(d) - Schedule of reportable transactions for the year
       ended December 31, 1997 (Schedule III)                                                                16
</TABLE>



*    Other schedules required by Section 2520.103-10 of the Department of Labor
     Rules and Regulations for Reporting and Disclosure under ERISA have been
     omitted since they are not applicable.



<PAGE>   3


                        REPORT OF INDEPENDENT ACCOUNTANTS


To the Employee Benefits Committee of the
Noble Drilling Corporation 401(k) Savings Plan


In our opinion, the accompanying statements of net assets available for benefits
and the related statements of changes in net assets available for benefits
present fairly, in all material respects, the net assets available for benefits
of the Noble Drilling Corporation 401(k) Savings Plan at December 31, 1997 and
1996, and the changes in net assets available for benefits for the years then
ended, in conformity with generally accepted accounting principles. These
financial statements are the responsibility of the Plan's management; our
responsibility is to express an opinion on these financial statements based on
our audits. We conducted our audits of these statements in accordance with
generally accepted auditing standards which require that we plan and perform the
audit to obtain reasonable assurance about whether the financial statements are
free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures in the financial statements,
assessing the accounting principles used and significant estimates made by
management, and evaluating the overall financial statement presentation. We
believe that our audits provide a reasonable basis for the opinion expressed
above.

Our audits were performed for the purpose of forming an opinion on the basic
financial statements taken as a whole. The additional information included in
Schedules I, II and III is presented for purposes of additional analysis and is
not a required part of the basic financial statements but is additional
information required by ERISA. Such information has been subjected to the
auditing procedures applied in the audits of the basic financial statements and,
in our opinion, is fairly stated in all material respects in relation to the
basic financial statements taken as a whole.




PRICE WATERHOUSE LLP

Houston, Texas
June 19, 1998



                                      -1-
<PAGE>   4



NOBLE DRILLING CORPORATION 401(k) SAVINGS PLAN
STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS
DECEMBER 31, 1997 AND 1996
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                        1997             1996
                                                     -----------     -----------
<S>                                                  <C>             <C>
Assets:-
   Cash                                              $        --     $   515,317
   Investments, at fair value:
      Short-term investments                                 364       2,586,673 *
      Noble Drilling Corporation common stock         13,879,128 *     9,530,740 *
      Noble Affiliates, Inc. common stock                  1,093         120,398
      Collective investment fund                       2,977,387 *            --
      United States government securities                     --       1,006,512 *
      Mutual funds                                     6,522,564 *            --
   Investment contract, at contract value                     --       3,573,882 *
   Securities receivable                                      --          37,541
   Contributions receivable:
      Participants                                       170,758         253,386
      Noble Drilling Corporation                          94,345         155,109
   Dividends and interest receivable                      44,144          18,247
   Participant loans                                     848,284         709,992
   Loan interest receivable                                3,982              --
                                                     -----------     -----------
                                                      24,542,049      18,507,797
Liabilities:
   Excess contributions refundable to employees               --          92,790
   Book overdraft                                         79,349              --
   Trust fees payable                                     17,141          14,231
   Stock purchase payable                                     --         280,691
                                                     -----------     -----------

Net assets available for benefits                    $24,445,559     $18,120,085
                                                     ===========     ===========
</TABLE>


*    This investment represents five percent or more of the total net assets
     available for benefits.



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

                                      - 2 -





<PAGE>   5



NOBLE DRILLING CORPORATION 401(k) SAVINGS PLAN
STATEMENTS OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS
YEARS ENDED DECEMBER 31, 1997 AND 1996
- -------------------------------------------------------------------------------


<TABLE>
<CAPTION>
                                                                1997             1996
                                                             -----------     -----------
<S>                                                          <C>             <C>
Additions attributed to:-
   Interest and dividend income                              $   415,807     $   111,311
   Net appreciation on investments                             6,049,312       4,919,428
   Contributions:
      Participants                                             1,734,166       1,388,299
      Employer                                                 1,122,343         339,709
      Other                                                           --          45,553
                                                             -----------     -----------
        Total additions                                        9,321,628       6,804,300
                                                             -----------     -----------
Deductions attributed to:
   Withdrawals                                                 3,431,565         414,024
   Administrative and investment expenses                        109,551          67,039
                                                             -----------     -----------
        Total deductions                                       3,541,116         481,063
                                                             -----------     -----------
Net increase in net assets available for benefits before
  rollovers/transfers from other plans                         5,780,512       6,323,237
Rollovers/transfers from other plans                             544,962       3,639,640
                                                             -----------     -----------
Net increase in net assets available for benefits              6,325,474       9,962,877
Net assets available for benefits, beginning of year          18,120,085       8,157,208
                                                             -----------     -----------

Net assets available for benefits, end of year               $24,445,559     $18,120,085
                                                             ===========     ===========
</TABLE>


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

                                      - 3 -

<PAGE>   6



NOBLE DRILLING CORPORATION 401(k) SAVINGS PLAN
NOTES TO FINANCIAL STATEMENTS
DECEMBER 31, 1997 AND 1996
- --------------------------------------------------------------------------------

1.   DESCRIPTION OF PLAN

     The following brief description of the provisions of the Noble Drilling
     Corporation 401(k) Savings Plan (the "Plan") is provided for general
     information purposes only. Participants should refer to the Plan document
     for a more complete description of the Plan's provisions.

     GENERAL 
     
     Noble Drilling Corporation (the "Company") established the Noble Drilling
     Corporation Thrift Plan (the "Thrift Plan") effective January 1, 1986. 
     Prior to October 1, 1985, the Company was a wholly-owned subsidiary of 
     Noble Affiliates, Inc. ("NAI"). Effective as of that date, the Company was 
     recapitalized and its common stock was distributed to the stockholders of 
     NAI in a tax-free spin-off. The Company's employees had participated in the
     Noble Affiliates, Inc. Thrift and Profit Sharing Plan (the "NAI Plan") 
     prior to October 1, 1985, and continued to participate in the NAI Plan 
     through December 31, 1985. Participants in the NAI Plan carried over 
     certain service, eligibility and vesting benefits upon entering the Plan.

     Effective October 1, 1997, the Thrift Plan was amended and restated to
     incorporate prior amendments, increase the maximum participant contribution
     percentage from 10% to 12% and allow for cash matching contributions. In
     addition, the Thrift Plan was renamed the Noble Drilling Corporation 401(k)
     Savings Plan.

     The Plan is a defined contribution plan. All employees of Noble Drilling
     Corporation and its participating subsidiaries who are U.S. citizens or
     U.S. taxpayers are eligible to enroll in the Plan. The Plan is subject to
     the provisions of the Employee Retirement Income Security Act of 1974,
     as amended ("ERISA"), and is administered by the Employee Benefits
     Committee of the Company (the "Committee"), whose members are appointed by
     Noble Drilling Corporation's Board of Directors.

     Through October 1, 1997, the Plan Trustee was Exchange National Bank and
     Trust Company of Ardmore, Oklahoma ("Exchange"). Effective October 1, 1997,
     The Charles Schwab Trust Company was appointed the Plan Trustee. Under the
     terms of the Plan, the Trustee, on behalf of the Plan, acquires, holds and
     disposes of securities, including the common stock of the Company owned by
     the Plan.

     SIGNIFICANT TRANSFERS FROM OTHER PLANS

     Effective May 1, 1996 and in connection with the acquisition of Chiles
     Offshore Corporation, the net assets available for plan benefits of the
     Chiles Offshore Corporation 401(k) Plan ("Chiles") were merged into the
     Plan.

     CONTRIBUTIONS

     Effective October 1, 1997, participants may contribute on a pre-tax basis
     up to 12% of their base compensation to the Plan. Prior to October 1, 1997,
     the maximum allowable participant contribution was 10%. Participants'
     pre-tax contributions were limited to $10,000 and $9,500 in 1997 and 1996,
     respectively.


                                     - 4 -

<PAGE>   7

NOBLE DRILLING CORPORATION 401(k) SAVINGS PLAN
NOTES TO FINANCIAL STATEMENTS
DECEMBER 31, 1997 AND 1996
- --------------------------------------------------------------------------------


     The Plan provides for the following employer matching contributions:

<TABLE>
<CAPTION>
                                                     PERCENTAGE OF                    MATCHING CONTRIBUTION
                   PARTICIPANT'S               PARTICIPANT'S CONTRIBUTION            LIMITED TO THE FOLLOWING
                 YEARS OF VESTING                     MATCHED BY                          PERCENTAGE OF
                      SERVICE                        THE COMPANY                    PARTICIPANT'S COMPENSATION
               <S>                              <C>                                 <C>
                    Less than 15                            70%                                   6%
                    15 or more                             100%                                   6%
</TABLE>

     The Plan provides that matching contributions are made in the Company's
     common stock. Pass-through voting rights for shares of common stock of the
     Company are credited to a participant's account, whether or not vested.
     Effective October 1, 1997, matching contributions may also be made in cash.

     TERMINATION

     The Company reserves the right to amend or terminate the Plan, subject to
     the provisions of ERISA. Upon notice of termination or permanent suspension
     of contributions, the accounts of all participants effected thereby shall
     become fully vested and shall be distributed in accordance with the
     provisions of the Plan.

     LOANS

     A participant has the ability to borrow funds from the employee's vested
     account balance. A loan is secured by the participant's account balance.
     Participants may borrow a maximum amount equal to the lesser of (i) 50
     percent of each participant's vested account balance under the Plan or (ii)
     $50,000, reduced by the excess, if any, of the highest outstanding loan
     balance outstanding in the previous year over the loan balance currently
     outstanding. The loans are repayable within five years unless used to
     acquire a principal residence, in which case the term of the loan is at the
     Committee's discretion. Repayment of the principal and interest of a loan
     is invested according to the participant's current investment directions
     for future pre-tax contributions to the Plan.

     During 1997 and 1996, $619,484 and $431,080, respectively, of new loans
     were issued to participants.

     WITHDRAWALS

     Withdrawals are permitted in the event of termination of employment,
     retirement, permanent disability, death or financial hardship, as defined
     in the Plan. In-service withdrawals may be made from a participant's
     after-tax account. Additionally, vested participants may make in-service
     withdrawals from the Company's matching account.

     PARTICIPANT ACCOUNTS

     Separate accounts are maintained for each participant. Participant accounts
     are credited with pre-tax contributions, rollover contributions, the
     Company's matching contributions and an allocation of investment earnings
     and losses. Furthermore, participant accounts are adjusted for withdrawals
     and transfers among investment options, if any.



                                      - 5 -
<PAGE>   8

NOBLE DRILLING CORPORATION 401(k) SAVINGS PLAN
NOTES TO FINANCIAL STATEMENTS
DECEMBER 31, 1997 AND 1996
- --------------------------------------------------------------------------------


     Participants have an option as to the manner in which their contributions
     may be invested. Separate funds are maintained and participants may direct
     their investments in 1% increments. A brief description of
     the Plan's investment options follows. For a detailed description of
     investment options and risk profiles, refer to the respective fund
     prospectus.

<TABLE>
<CAPTION>
                  FUND                                              INVESTMENTS

<S>                                                   <C>
           Morley Institutional                       Guaranteed investment contracts, bank investment contracts and money-market 
           Investors' Fund (Morley)                   instruments.

           PIMCO Total Return                         United States government securities, corporate bonds, mortgage related 
           Institutional Fund (PIMCO)                 securities and money-market instruments.

           Dodge & Cox Balanced                       Common stocks and convertible securities as well as investment grade fixed 
           Fund (Dodge & Cox)                         income securities.

           Vanguard Index 500 Fund                    Common stocks of small, growing companies as well as large, established
           (Vanguard)                                 companies.  Seeks to replicate the aggregate price and yield of the S&P
                                                      500 index.

           Brandywine Fund (Brandywine)               Common stocks of small to medium-sized companies that are expected to 
                                                      demonstrate growth in earnings and revenue.

           American AAdvantage                        Common stocks and debt securities of companies and governments outside
           International Equity Fund -                the United States.
           Institutional Class (American
           AAdvantage)

           Fund ND                                    Noble Drilling Corporation common stock
</TABLE>

     Prior to October 1, 1997, investment options available to the participants
     consisted of the following investment funds:

<TABLE>
<CAPTION>
                  FUND                                              INVESTMENTS

<S>                                          <C>
           Fund A                            United States government securities, highly rated corporate bonds and preferred 
                                             stocks, commercial paper and cash deposits.
                                                                          
           Fund B                            Readily marketable common and preferred stocks.

           Fund I                            Guaranteed investment contracts or funds invested solely in such items.
                                             

           Fund ND                           Noble Drilling Corporation common stock (limited to a maximum of 50% of
                                             contributions)

           Fund N                            NAI common stock purchased by Plan participants prior to spin-off from NAI.
                                             
                                             
</TABLE>

     The balance in the General Fund prior to October 1, 1997 represented
     unallocated employee forfeitures and consisted of short-term, highly liquid
     investments in money market funds. Subsequent to October 1, 1997,
     unallocated forfeitures are maintained in the Noble Stock Fund and the
     Morley Institutional Investors' Fund. Unallocated forfeitures are
     segregated from all




                                     - 6 -
<PAGE>   9

NOBLE DRILLING CORPORATION 401(k) SAVINGS PLAN
NOTES TO FINANCIAL STATEMENTS
DECEMBER 31, 1997 AND 1996
- --------------------------------------------------------------------------------

     other participants' records. Unallocated forfeitures of $150,798 and
     $37,620 at December 31, 1997 and 1996, respectively, are used to reduce
     future Company matching contributions.

     See Note 7 for financial information by fund.

     VESTING

     A participant's contributions and rollover amounts are 100 percent vested
     at all times. Participants become fully vested in the Company's matching
     contributions upon five years of credited service. Also, a participant
     becomes fully vested in the Company's matching contributions, regardless of
     years of service, if employment is terminated due to normal retirement,
     total disability or death.

     Certain Chiles participants become vested in the Company's contributions 
     and the related earnings of such contributions after attainment of certain 
     years of services, as specified below:

<TABLE>
<CAPTION>
                                          VESTED AND NONFORFEITABLE
               FULL YEARS                 PERCENTAGE OF EMPLOYER'S
               OF SERVICE                CONTRIBUTION INTO THE PLAN
          <S>                            <C>
                    1                                 20%
                    2                                 40%
                    3                                 60%
                    4                                 80%
                    5                                100%
</TABLE>

     In general, a participant will be deemed to have completed a "year of
     service" for each 12-month period during which the participant completes at
     least 1,000 hours of service.

2.   SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     BASIS OF ACCOUNTING

     The Plan's financial statements are prepared on the accrual basis of
     accounting in conformity with generally accepted accounting principles.

     INVESTMENTS

     Investments traded on national securities exchanges are valued at closing
     prices on the last business day of the year; investments traded on the
     over-the-counter market are valued at an average of the last reported bid
     and ask prices. The investment in the bank commingled fund is highly
     liquid; therefore, the fair value approximates cost. The cost of
     investments sold is determined on the basis of average cost.

     Prior to October 1, 1997, the Plan invested in guaranteed investment
     contracts through a pooled account. This account was credited with earnings
     on the underlying investments and charged for Plan withdrawals and
     administrative expenses. These contracts are included in the financial
     statements at contract value, which approximates fair value, as reported to
     the Plan by the administrator of the pooled account. Contract value
     represents contributions made under the contract, plus earnings, less Plan
     withdrawals and administrative expenses.



                                     - 7 -
<PAGE>   10
NOBLE DRILLING CORPORATION 401(k) SAVINGS PLAN
NOTES TO FINANCIAL STATEMENTS
DECEMBER 31, 1997 AND 1996
- --------------------------------------------------------------------------------

     EXPENSES

     Plan administration expenses are paid by the Plan, unless paid by the
     Company, at the Company's sole discretion. For the years ended December 31,
     1997 and 1996, administrative expenses of $109,551 and $67,039,
     respectively, were paid by the Plan.

     EXCESS CONTRIBUTIONS REFUNDABLE TO EMPLOYEES 

     Excess contributions refundable to highly compensated employees represent 
     the refunds necessary to meet certain nondiscrimination provisions of the 
     Internal Revenue Code (the "Code").

     USE OF ESTIMATES

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

     OTHER

     Certain amounts in the prior year financial statements have been
     reclassified to conform to the 1997 presentation.

3.   TAX STATUS

     The Company has received a favorable determination letter from the Internal
     Revenue Service dated October 27, 1995. A favorable determination letter
     allows the Company to take a business expense deduction for contributions
     paid within a specified period and for participants' benefits not to be
     taxed until received by them. In addition, since the trust fund of the Plan
     is treated as an exempt organization, its income is not subject to federal
     or state income taxes.

     The Plan has been amended since applying for the determination letter.
     However, the Plan administrator and the Plan's tax counsel believe that the
     Plan is designed and is currently being operated in compliance with the
     applicable requirements of the Code.

4.   PARTICIPANT UNITS

     Units assigned to participants are as follows at December 31, 1997:

<TABLE>
<CAPTION>
                                                                                    MARKET
                                                                  NUMBER            VALUE
                                                                 OF UNITS          PER UNIT
<S>                                                               <C>              <C>
     Morley Institutional Investors' Fund                         158,245          $ 18.815
     PIMCO Total Return Institutional Fund                        135,112             10.60
     Brandywine Fund                                               41,120             30.89
     Vanguard Index 500 Fund                                       29,449             90.07
     Dodge & Cox Balanced Fund                                     13,488             66.78
     American AAdvantage International Equity Fund                 16,672             16.01
</TABLE>




                                     - 8 -
<PAGE>   11
NOBLE DRILLING CORPORATION 401(k) SAVINGS PLAN
NOTES TO FINANCIAL STATEMENTS
DECEMBER 31, 1997 AND 1996
- --------------------------------------------------------------------------------

5.   REALIZED AND UNREALIZED GAIN ON INVESTMENTS

     Realized gain (loss) represents the difference between the sales price and
     historical cost of the respective investments. Realized gain (loss) on 
     investments for the years ended December 31 was as follows:

<TABLE>
<CAPTION>
                                                                 1997              1996
                                                             ------------      -----------
<S>                                                          <C>               <C>
     Common stock                                            $  2,255,606      $    83,576
     Bank commingled fund                                         524,935           59,828
     Collective investment fund                                   150,481                -
     Guaranteed investment contracts                             (194,252)              95
     United States government securities                           13,022           (9,976)
     Mutual funds                                                 (29,037)               -
                                                             ------------      -----------

                                                             $  2,720,755      $   133,523
                                                             ============      ===========
</TABLE>


     Unrealized gain (loss) on investments for the years ended December 31 was
     as follows:


<TABLE>
<CAPTION>
                                                                 1997              1996
                                                             ------------       ------------
<S>                                                          <C>                <C>
     Common stock                                            $  3,388,505       $  4,491,303
     Bank commingled fund                                               -            218,251
     Collective investment fund                                   242,767                  -
     Guaranteed investment contracts                                    -            114,576
     United States government securities                                -            (38,225)
     Mutual funds                                                (302,715)                 -
                                                             ------------       ------------

                                                             $  3,328,557       $  4,785,905
                                                             ============       ============
</TABLE>



6.   RELATED PARTIES

     The Trustee is authorized to invest in securities under its control.
     Transactions resulting in plan assets being transferred to, or used by, a
     related party are prohibited under ERISA unless a specific exemption
     exists. Exchange is a "party-in-interest" as defined by ERISA as a result
     of investing plan assets in one of its funds. However, such transactions
     are exempt and are not prohibited by ERISA.




                                     - 9 -
<PAGE>   12

NOBLE DRILLING CORPORATION 401(k) SAVINGS PLAN
NOTES TO FINANCIAL STATEMENTS
DECEMBER 31, 1997 AND 1996
- --------------------------------------------------------------------------------

7. FINANCIAL INFORMATION BY FUND (PAGE 1 OF 4)

                   NET ASSETS AVAILABLE FOR BENEFITS - BY FUND
                                DECEMBER 31, 1997


<TABLE>
<CAPTION>


                                                                          PARTICIPANT DIRECTED
                                        -------------------------------------------------------------------------------------------
                                                                          DODGE &                                        AMERICAN
                                          MORLEY           PIMCO            COX          VANGUARD       BRANDYWINE       AADVANTAGE
<S>                                     <C>             <C>             <C>             <C>             <C>             <C>
Assets:- 
   Investments, at fair value:
      Short-term investments            $       364
      Noble Drilling Corporation
        common stock*
      Noble Affiliates, Inc.
        common stock
      Collective investment fund*         2,977,387
      Mutual funds*                                     $ 1,432,192     $   900,755     $ 2,652,498     $ 1,270,200     $   266,919
   Contributions receivable:
      Participants                           15,755          12,841          21,566          41,818          37,071           9,786
      Noble Drilling Corporation
   Dividends and interest receivable                         44,144
   Participant loans
   Loan interest receivable                     426             268             912             775             696             160
   Loan payment receivable                    1,904           1,018           3,413           3,101           2,603             685
                                        -----------     -----------     -----------     -----------     -----------     -----------
                                          2,995,836       1,490,463         926,646       2,698,192       1,310,570         277,550
Liabilities:
   Book overdraft                                             1,218           8,283          42,874          18,385
   Trust fees payable                         2,475           1,164             693           2,002             978             217
                                        -----------     -----------     -----------     -----------     -----------     -----------

Net assets available for benefits       $ 2,993,361     $ 1,488,081     $   917,670     $ 2,653,316     $ 1,291,207     $   277,333
                                        ===========     ===========     ===========     ===========     ===========     ===========

<CAPTION>
                                                           NON-
                                       PARTICIPANT      PARTICIPANT
                                        DIRECTED         DIRECTED
                                       -----------      -----------

                                          FUND ND         FUND N            LOANS           TOTAL
<S>                                     <C>             <C>              <C>             <C>
Assets:-
   Investments, at fair value:
      Short-term investments                                                             $       364
      Noble Drilling Corporation
        common stock*                   $13,879,128                                       13,879,128
      Noble Affiliates, Inc.
        common stock                                    $     1,093                            1,093
      Collective investment fund*                                                          2,977,387
      Mutual funds*                                                                        6,522,564
   Contributions receivable:
      Participants                           31,921                                          170,758
      Noble Drilling Corporation             94,345                                           94,345
   Dividends and interest receivable                                                          44,144
   Participant loans                                                     $   848,284         848,284
   Loan interest receivable                     745                                            3,982
   Loan payment receivable                    2,574                          (15,298)
                                        -----------     -----------      -----------     -----------
                                         14,008,713           1,093          832,986      24,542,049
Liabilities:
   Book overdraft                             7,545           1,044                           79,349
   Trust fees payable                         9,612                                           17,141
                                        -----------     -----------      -----------     -----------

Net assets available for benefits       $13,991,556     $        49      $   832,986     $24,445,559
                                        ===========     ===========      ===========     ===========


</TABLE>




*    These investments represent five percent or more of total net assets
     available for benefits.




                                     - 10 -

<PAGE>   13

NOBLE DRILLING CORPORATION 401(k) SAVINGS PLAN
NOTES TO FINANCIAL STATEMENTS
DECEMBER 31, 1997 AND 1996
- --------------------------------------------------------------------------------


7.   FINANCIAL INFORMATION BY FUND (PAGE 2 OF 4)

                   NET ASSETS AVAILABLE FOR BENEFITS - BY FUND

                                DECEMBER 31, 1996

<TABLE>
<CAPTION>
                                                                                                                NONPARTICIPANT
                                                                    PARTICIPANT DIRECTED                           DIRECTED
                                                 -------------------------------------------------------------  ---------------

                                                   FUND A          FUND B           FUND I         FUND ND         FUND N
<S>                                              <C>             <C>             <C>             <C>             <C>
Assets:-
   Cash                                          $   515,314     $         1                     $         1     $         1
   Investments, at fair value:
      Short-term investments*                        326,165       1,906,590     $    18,690         290,352           7,256
      Noble Drilling Corporation
        common stock*                                                                              9,530,740
      Noble Affiliates, Inc. common stock                                                                            120,398
      United States government securities*         1,006,512
   Investment contract, at contract value*                                         3,573,882
   Securities receivable                                              29,885           7,656
   Contributions receivable:
      Participants                                    47,198          51,906          97,244          57,038
      Noble Drilling Corporation                                                                     155,109
   Dividends and interest receivable                  12,318           1,704           3,455             750              20
   Interfund transfers receivables (payable)              10              10              20              49               1
   Participant loans
                                                 -----------     -----------     -----------     -----------     -----------
                                                   1,907,517       1,990,096       3,700,947      10,034,039         127,676
Liabilities:
   Excess contributions refundable to
     employees                                         4,222                                          88,568
   Trust fees payable                                  3,633           2,573           2,000           6,000              25
   Stock purchase payable                                                                            280,691
                                                 -----------     -----------     -----------     -----------     -----------

Net assets available for benefits                $ 1,899,662     $ 1,987,523     $ 3,698,947     $ 9,658,780     $   127,651
                                                 ===========     ===========     ===========     ===========     ===========

<CAPTION>
                                                NONPARTICIPANT
                                                   DIRECTED
                                                --------------
                                                   GENERAL
                                                    FUND             LOANS           TOTAL
<S>                                              <C>              <C>             <C>
Assets:-
   Cash                                                                           $   515,317
   Investments, at fair value:
      Short-term investments*                    $    37,620                        2,586,673
      Noble Drilling Corporation
        common stock*                                                               9,530,740
      Noble Affiliates, Inc. common stock                                             120,398
      United States government securities*                                          1,006,512
   Investment contract, at contract value*                                          3,573,882
   Securities receivable                                                               37,541
   Contributions receivable:
      Participants                                                                    253,386
      Noble Drilling Corporation                                                      155,109
   Dividends and interest receivable                                                   18,247
   Interfund transfers receivables (payable)             (90)
   Participant loans                                              $   709,992         709,992
                                                 -----------      -----------     -----------
                                                      37,530          709,992      18,507,797
Liabilities:
   Excess contributions refundable to
     employees                                                                         92,790
   Trust fees payable                                                                  14,231
   Stock purchase payable                                                             280,691
                                                 -----------      -----------     -----------

Net assets available for benefits                $    37,530      $   709,992     $18,120,085
                                                 ===========      ===========     ===========
</TABLE>


*    These investments represent five percent or more of total net assets
     available for benefits.




                                     - 11 -
<PAGE>   14

NOBLE DRILLING CORPORATION 401(k) SAVINGS PLAN
NOTES TO FINANCIAL STATEMENTS
DECEMBER 31, 1997 AND 1996
- --------------------------------------------------------------------------------


7.   FINANCIAL INFORMATION BY FUND (PAGE 3 OF 4)

             CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS - BY FUND

                          YEAR ENDED DECEMBER 31, 1997

<TABLE>
<CAPTION>

                                                                            PARTICIPANT DIRECTED
                                    -----------------------------------------------------------------------------------------------
                                                                                                                          DODGE &
                                      FUND A           FUND B            FUND I          MORLEY            PIMCO           COX
<S>                                 <C>              <C>              <C>              <C>              <C>            <C>
Additions attributed to:-
   Interest and dividend income     $   110,161      $    12,317      $    15,168      $     2,175      $    56,762    $    49,984
   Net appreciation (deprecia-
     tion) on investments                13,022          524,935         (194,252)         393,248          (13,290)       (46,734)
   Contributions:
      Participants                      199,840          274,141          370,650           81,074           63,154         61,666
      Employer
                                    -----------      -----------      -----------      -----------      -----------    -----------
        Total additions                 323,023          811,393          191,566          476,497          106,626         64,916
                                    -----------      -----------      -----------      -----------      -----------    -----------
Deductions attributed to:
   Transfer of assets
     between Trustees                 2,057,601        2,822,647        3,520,423       (3,520,413)      (2,057,601)
   Participant loans, net                 8,297           10,024          100,894            2,113           (8,381)       (15,526)
   Withdrawals                           54,696           43,347          287,128          611,627          221,965          2,590
   Administrative and invest-
     ment expenses                       12,519           12,976           10,102            7,262            3,136          1,690
   Interfund transfers, net              89,572          (90,078)         (28,034)         382,547          459,426       (765,444)
                                    -----------      -----------      -----------      -----------      -----------    -----------
        Total deductions              2,222,685        2,798,916        3,890,513       (2,516,864)      (1,381,455)      (776,690)
                                    -----------      -----------      -----------      -----------      -----------    -----------
Net increase (decrease) in
  net assets available for
  benefits before rollovers/
  transfers from other plans         (1,899,662)      (1,987,523)      (3,698,947)       2,993,361        1,488,081        841,606
Rollover/transfers from 
  other plans                                                                                                               76,064
                                    -----------      -----------      -----------      -----------      -----------    -----------
Net increase (decrease)
  in net assets
  available for benefits             (1,899,662)      (1,987,523)      (3,698,947)       2,993,361        1,488,081        917,670
Net assets available for
  benefits, beginning
  of year                             1,899,662        1,987,523        3,698,947
                                    -----------      -----------      -----------      -----------      -----------    -----------

Net assets available for
  benefits, end of year             $         -      $         -      $         -      $ 2,993,361      $ 1,488,081    $   917,670
                                    ===========      ===========      ===========      ===========      ===========    ===========

<CAPTION>
                                                        PARTICIPANT DIRECTED                    
                                    --------------------------------------------------------------
                                                                         AMERICAN
                                     VANGUARD         BRANDYWINE        AADVANTAGE       FUND ND
<S>                                 <C>              <C>                <C>            <C>
Additions attributed to:-
   Interest and dividend income     $    30,186      $    97,670        $  13,349      $    19,188
   Net appreciation (deprecia-
     tion) on investments               (12,397)        (238,862)         (20,469)       5,657,584
   Contributions:
      Participants                      155,560          103,124           27,193          396,902
      Employer                                                                           1,122,343
                                    -----------      -----------        ---------      -----------
        Total additions                 173,349          (38,068)          20,073        7,196,017
                                    -----------      -----------        ---------      -----------
Deductions attributed to:
   Transfer of assets
     between Trustees                (2,822,647)                                          (163,614)
   Participant loans, net                (7,402)            (460)          (1,403)         215,079
   Withdrawals                          227,285              199              205        1,768,606
   Administrative and invest-
     ment expenses                        5,366            2,567              514           52,843
   Interfund transfers, net             293,810       (1,193,784)        (256,576)       1,065,847
                                    -----------      -----------        ---------      -----------
        Total deductions             (2,303,588)      (1,191,478)        (257,260)       2,938,761
                                    -----------      -----------        ---------      -----------
Net increase (decrease) in
  net assets available for
  benefits before rollovers/
  transfers from other plans          2,476,937        1,153,410          277,333        4,257,256
Rollover/transfers from 
  other plans                           176,379          137,797                            75,520
                                    -----------      -----------        ---------      -----------
Net increase (decrease)
  in net assets
  available for benefits              2,653,316        1,291,207          277,333        4,332,776
Net assets available for
  benefits, beginning
  of year                                                                                9,658,780
                                    -----------      -----------        ---------      -----------

Net assets available for
  benefits, end of year             $ 2,653,316      $ 1,291,207        $ 277,333      $13,991,556
                                    ===========      ===========        =========      ===========

<CAPTION>
                                         NONPARTICIPANT
                                            DIRECTED
                                    --------------------------
                                                    GENERAL
                                     FUND N           FUND             LOANS           TOTAL
<S>                                 <C>              <C>             <C>              <C>
Additions attributed to:-
   Interest and dividend income     $     401       $    8,446                        $  415,807
   Net appreciation (deprecia-
     tion) on investments             (13,473)                                         6,049,312
   Contributions:
      Participants                        862                                          1,734,166
      Employer                                                                         1,122,343
                                    ---------       ----------       ----------      -----------
        Total additions               (12,210)           8,446                         9,321,628
                                    ---------       ----------       ----------      -----------
Deductions attributed to:
   Transfer of assets
     between Trustees                                  163,604
   Participant loans, net                (412)                         (302,823)
   Withdrawals                                                          213,917        3,431,565
   Administrative and invest-
     ment expenses                        576                                            109,551
   Interfund transfers, net           115,228          (72,514)
                                    ---------       ----------       ----------      -----------
        Total deductions              115,392           91,090          (88,906)       3,541,116
                                    ---------       ----------       ----------      -----------
Net increase (decrease) in
  net assets available for
  benefits before rollovers/
  transfers from other plans         (127,602)         (82,644)          88,906        5,780,512
Rollover/transfers from 
  other plans                                           45,114           34,088          544,962
                                    ---------       ----------       ----------      -----------
Net increase (decrease)
  in net assets
  available for benefits             (127,602)         (37,530)         122,994        6,325,474
Net assets available for
  benefits, beginning
  of year                              127,651          37,530          709,992       18,120,085
                                    ----------      ----------       ----------      -----------

Net assets available for
  benefits, end of year             $       49      $        -       $  832,986      $24,445,559
                                    ==========      ==========       ==========      ===========
</TABLE>



                                     - 12 -
<PAGE>   15

NOBLE DRILLING CORPORATION 401(k) SAVINGS PLAN
NOTES TO FINANCIAL STATEMENTS
DECEMBER 31, 1997 AND 1996
- --------------------------------------------------------------------------------

7.   FINANCIAL INFORMATION BY FUND (PAGE 4 OF 4)

             CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS - BY FUND

                          YEAR ENDED DECEMBER 31, 1996

<TABLE>
<CAPTION>
                                                                                                               NONPARTICIPANT
                                                                  PARTICIPANT DIRECTED                            DIRECTED
                                              -------------------------------------------------------------    --------------

                                                FUND A           FUND B           FUND I          FUND ND          FUND N
<S>                                           <C>              <C>              <C>             <C>              <C>
Additions attributed to:- 
   Interest and dividend income               $    90,765      $    11,504      $     5,033     $     1,035      $       654
   Net appreciation (depreciation) on
     investments                                  (48,201)         278,079          114,671       4,529,763           45,116
   Contributions:
      Participants                                270,191          262,110          568,796         287,202
      Employer                                                                                      339,709
      Other                                                         37,053            8,500
                                              -----------      -----------      -----------     -----------      -----------
        Total additions                           312,755          588,746          697,000       5,157,709           45,770
                                              -----------      -----------      -----------     -----------      -----------
Deductions attributed to:
   Participant loans, net                          68,586           51,219           72,880         178,038             (241)
   Withdrawals                                     84,598           22,594           81,058         225,774
   Administrative and investment expenses          20,880           13,642           11,126          21,342               49
   Interfund transfers, net                        11,281          (43,514)           5,886        (158,711)           1,962
                                              -----------      -----------      -----------     -----------      -----------
        Total deductions                          185,345           43,941          170,950         266,443            1,770
                                              -----------      -----------      -----------     -----------      -----------
Net increase (decrease) in net assets
  available for benefits before 
  rollovers/transfers from other plans            127,410          544,805          526,050       4,891,266           44,000
Rollovers/transfers from other plans              268,615          344,294        1,499,253       1,187,968          
                                              -----------      -----------      -----------     -----------      -----------
Net increase (decrease) in net assets
  available for benefits                          396,025          889,099        2,025,303       6,079,234           44,000
Net assets available for benefits,
  beginning of year                             1,503,637        1,098,424        1,673,644       3,579,546           83,651
                                              -----------      -----------      -----------     -----------      -----------

Net assets available for benefits,
  end of year                                 $ 1,899,662      $ 1,987,523      $ 3,698,947     $ 9,658,780      $   127,651
                                              ===========      ===========      ===========     ===========      ===========

<CAPTION>
                                             NONPARTICIPANT
                                                DIRECTED
                                             --------------
                                               GENERAL
                                                 FUND             LOANS            TOTAL
<S>                                           <C>              <C>              <C>
Additions attributed to:-
   Interest and dividend income               $     2,320                       $   111,311
   Net appreciation (depreciation) on
     investments                                                                  4,919,428
   Contributions:
      Participants                                                                1,388,299
      Employer                                                                      339,709
      Other                                                                          45,553
                                              -----------      -----------      -----------
        Total additions                             2,320                         6,804,300
                                              -----------      -----------      -----------
Deductions attributed to:
   Participant loans, net                                         (370,482)
   Withdrawals                                                                      414,024
   Administrative and investment expenses                                            67,039
   Interfund transfers, net                       183,096
                                              -----------      -----------      -----------
        Total deductions                          183,096         (370,482)         481,063
                                              -----------      -----------      -----------
Net increase (decrease) in net assets
  available for benefits before 
  rollovers/transfers from other plans           (180,776)         370,482        6,323,237
Rollovers/transfers from other plans                               339,510        3,639,640
                                              -----------      -----------      -----------
Net increase (decrease) in net assets
  available for benefits                         (180,776)         709,992        9,962,877
Net assets available for benefits,
  beginning of year                               218,306                         8,157,208
                                              -----------      -----------      -----------

Net assets available for benefits,
  end of year                                 $    37,530      $   709,992      $18,120,085
                                              ===========      ===========      ===========
</TABLE>


                                     - 13 -
<PAGE>   16



                                                                      SCHEDULE I
NOBLE DRILLING CORPORATION 401(k) SAVINGS PLAN
ITEM 27(a) - SCHEDULE OF ASSETS HELD FOR INVESTMENT PURPOSES
DECEMBER 31, 1997
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                     (c) DESCRIPTION
                                        ------------------------------------------
                                                                       NUMBER OF                            (e)
                    (b)                                               SHARES/UNITS         (d)            CURRENT
(a)          IDENTITY OF ISSUE                 ASSET TYPE             OF INTEREST         COST             VALUE
<S>    <C>                              <C>                            <C>          <C>              <C>
       Noble Drilling Corporation       Common stock                      453,196   $   4,163,671    $   13,879,128
       Morley Institutional
         Investors' Fund                Mutual fund                       158,245       2,734,620         2,977,387
       Vanguard Index 500 Fund          Mutual fund                        29,449       2,646,260         2,652,498
       Brandywine Fund                  Mutual fund                        41,120       1,496,028         1,270,200
       PIMCO Total Return
         Institutional Fund             Mutual fund                       135,112       1,448,948         1,432,192
       Dodge & Cox Balanced Fund        Mutual fund                        13,488         946,750           900,755
 *     Participant loans                Loans, interest rates
                                          ranging from 7% - 10.25%                        848,284           848,284
       American AAdvantage
         International Equity Fund -
         Institutional Class            Mutual fund                        16,672         287,293           266,919
       Noble Affiliates, Inc.           Common stock                           31           1,169             1,093
 *     Schwab Retirement Money
         Fund                           Money market fund                       1             364               364
                                                                                    -------------    --------------

              Total assets held for investment purposes                             $  14,573,387    $   24,228,820
                                                                                    =============    ==============

</TABLE>



*    Indicates party-in-interest transaction.




                                     - 14 -
<PAGE>   17
\


                                                                     SCHEDULE II
NOBLE DRILLING CORPORATION 401(k) SAVINGS PLAN
ITEM 27(b) - SCHEDULE OF LOANS OR FIXED INCOME OBLIGATIONS
DECEMBER 31, 1997
- -------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                          (d)           (e)
                                                       AMOUNT OF       AMOUNT OF      (f)
                                          (c)          PRINCIPAL       INTEREST      UNPAID
                   (b)                  ORIGINAL       RECEIVED IN    RECEIVED IN    BALANCE
          IDENTITY AND ADDRESS           AMOUNT        REPORTING       REPORTING     AT END
(a)            OF OBLIGOR                OF LOAN          YEAR           YEAR        OF YEAR
<S>    <C>                           <C>             <C>            <C>          <C>
 *     James Boyette                 $     4,000     $      297     $     -      $    2,255
       221 Boyette Rd.
       Joneville, LA  71343

 *     Willard Chevallier                  3,000            126          41           2,874
       P.O. Box 1045
       Joneville, LA  71343

 *     Billy Kinnison                     10,000              -           -          10,000
       P.O. Box 897
       Columbia, LA  71418

 *     David LaPrairie                     2,000            315           9             400
       718 Highway 1193
       Marksville, LA  71351

 *     Roy Marceaux                        2,700             74          36           2,552
       Route 3, Box 299-B
       Kaplan, LA  70548

 *     Gabriel Padilla                    11,300            643          33           2,485
       15950 Oak Mountain Dr.
       Houston, TX  77095

 *     Michael Ponder                     11,963            134         175          10,261
       P.O. Box 1660
       Hemphill, TX  75948

 *     James Wise                         10,000            127          34           7,903
       Route 2, Box 777
       Marion, LA 71260
                                     -----------     ----------     -------      ----------
             Total                   $    54,963     $    1,716     $   328      $   38,730
                                     ===========     ==========     =======      ==========

<CAPTION>


                                                                     (h)            (i)
                   (b)                      (g)                    AMOUNT OF      AMOUNT OF
          IDENTITY AND ADDRESS           DESCRIPTION               PRINCIPAL      INTEREST
(a)            OF OBLIGOR                  OF LOAN                  OVERDUE        OVERDUE
<S>    <C>                           <C>                          <C>            <C>
 *     James Boyette                 10.12%, issued 1/24/96,      $   2,255      $       -
       221 Boyette Rd.               final payment due
       Joneville, LA  71343          1/01/99

 *     Willard Chevallier            8.25%, issued 4/01/97,           2,874              -
       P.O. Box 1045                 final payment due
       Joneville, LA  71343          3/01/00

 *     Billy Kinnison                8.25%, issued 4/07/97,          10,000              -
       P.O. Box 897                  final payment due
       Columbia, LA  71418           6/01/02

 *     David LaPrairie               10%, issued 5/24/96,               400              -
       718 Highway 1193              final payment due
       Marksville, LA  71351         6/22/97

 *     Roy Marceaux                  8.25%, issued 11/19/96,          2,552              -
       Route 3, Box 299-B            final payment due
       Kaplan, LA  70548             12/01/01

 *     Gabriel Padilla               7%, issued 3/28/94, final        2,485              -
       15950 Oak Mountain Dr.        payment due 3/31/98
       Houston, TX  77095

 *     Michael Ponder                9.5%, issued 1/13/95,           10,261              -
       P.O. Box 1660                 final payment due
       Hemphill, TX  75948           12/21/99

 *     James Wise                    10.05%, issued 6/26/96,          7,903              -
       Route 2, Box 777              final payment due
       Marion, LA 71260              6/08/99
                                                                  ---------      ---------
             Total                                                $  38,730      $       -
                                                                  =========      =========
</TABLE>


* Indicates party-in-interest transaction.


                                     - 15 -
<PAGE>   18


                                                                    SCHEDULE III
NOBLE DRILLING CORPORATION 401(k) SAVINGS PLAN
ITEM 27(d) - SCHEDULE OF REPORTABLE TRANSACTIONS
YEAR ENDED DECEMBER 31, 1997
- -------------------------------------------------------------------------------


<TABLE>
<CAPTION>


           (a)                         (b)                                             (c)              (d)
       IDENTITY OF                 DESCRIPTION            NUMBER OF   NUMBER OF      PURCHASE          SELLING
      PARTY INVOLVED                 OF ASSET             PURCHASES    SALES          PRICE            PRICE

<S>                           <C>                         <C>          <C>        <C>              <C>          
Exchange National Bank        ENB Pooled MM Fund            213          180      $   7,513,208    $   8,851,019

U.S. Treasury Note            5.75%, 12/31/98                 2            7            687,778          689,234

Schwab                        Brandywine Fund                37           17          1,585,911           76,849

Schwab                        Dodge & Cox Balanced
                                Fund                         33           22            981,579           34,090

Schwab                        Morley Institutional
                                Investors' Fund              34           34            744,341        1,679,658

Noble Drilling Corporation    Common stock                   47           26          1,602,747        2,913,598

Schwab                        PIMCO Total Return
                                Institutional Fund           25           40          2,305,126          859,644

Schwab                        Vanguard Index
                                500 Fund                     35           36          3,483,606          818,711

<CAPTION>
                                                       (h)
                                                  CURRENT VALUE           (i)
           (a)                     (g)             OF ASSET ON            NET
       IDENTITY OF               COST OF           TRANSACTION            GAIN
      PARTY INVOLVED            ASSET SOLD            DATE               (LOSS)
<S>                           <C>                <C>                    <C>          
Exchange National Bank         $   8,851,019      $   8,851,019

U.S. Treasury Note                   687,778            689,234        $    1,456

Schwab                                89,883             76,849           (13,034)

Schwab
                                      34,829             34,090              (739)

Schwab
                                   1,529,177          1,679,658           150,481

Noble Drilling Corporation           727,586          2,913,598         2,186,012

Schwab
                                     856,178            859,644             3,466

Schwab
                                     837,346            818,711           (18,635)

</TABLE>

- ----------
As defined by Section 2520.103-6 of the Department of Labor Rules and
Regulations governing reporting and disclosure under the Employee Retirement
Income Security Act of 1974, as amended, the above are reportable transactions
of the Noble Drilling Corporation 401(k) Savings Plan. Columns (e) and (f) have 
been omitted because they are not applicable.


                                     - 16 -
<PAGE>   19


                                                                    


                       CONSENT OF INDEPENDENT ACCOUNTANTS


We hereby consent to the incorporation by reference in the Registration
Statements on Forms S-8 (No. 33-3289, No. 33-15269, No. 33-18966, No. 33-46724,
No. 33-50270, No. 33-50272, No. 33-62394, No. 33-57675, No. 333-25857 and No.
333-17407) of Noble Drilling Corporation of our report dated June 19, 1998
appearing on page 1 of Exhibit 99.1 to this Form 10-K/A (Amendment No. 1).




PRICE WATERHOUSE LLP

Houston, Texas
June 26, 1998




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