NOBLE DRILLING CORP
S-8, 1999-06-11
DRILLING OIL & GAS WELLS
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<PAGE>   1
                                                           Registration No. 333-

     As filed with the Securities and Exchange Commission on June 11, 1999
================================================================================


                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    --------

                                    FORM S-8
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                                    --------

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

         DELAWARE                                        73-0374541
(State or other jurisdiction                (I.R.S. Employer Identification No.)
of incorporation or organization)


   10370 RICHMOND AVENUE, SUITE 400
           HOUSTON, TEXAS                                    77042
(Address of Principal Executive Offices)                   (Zip Code)


                                    --------

                  NOBLE DRILLING CORPORATION 1991 STOCK OPTION
                            AND RESTRICTED STOCK PLAN
                            (Full title of the plan)

                                    --------

        ROBERT D. CAMPBELL                                      COPY TO:
             PRESIDENT                                       DAVID L. EMMONS
     NOBLE DRILLING CORPORATION                          THOMPSON & KNIGHT, P.C.
   10370 RICHMOND AVENUE, SUITE 400                        1700 PACIFIC AVENUE
        HOUSTON, TEXAS 77042                                   SUITE 3300
(Name and address of agent for service)                    DALLAS, TEXAS 75201


                                 (713) 974-3131
                          (Telephone number, including
                        area code, of agent for service)


<TABLE>
<CAPTION>
                         CALCULATION OF REGISTRATION FEE
- --------------------------------------------------------------------------------
   Title of                        Proposed     Proposed Maximum       Amount
  Securities        Amount         Maximum          Aggregate            of
     to be           to be      Offering Price      Offering        Registration
  Registered     Registered(1)   per Share(2)       Price(2)            Fee
- --------------------------------------------------------------------------------
<S>              <C>            <C>             <C>                 <C>
 Common Stock,     5,000,000
par value $.10      shares          $18.375      $91,875,000.00      $25,541.25
   per share
- --------------------------------------------------------------------------------
</TABLE>

(1)  Pursuant to Rule 416 under the Securities Act of 1933, shares issuable upon
     any stock split, stock dividend or similar transaction with respect to
     these shares are also being registered hereunder.

(2)  Estimated solely for the purpose of determining the registration fee
     pursuant to Rule 457(h) on the basis of the average of the high and low
     sales prices of the Common Stock reported on the New York Stock Exchange
     Composite Tape on June 4, 1999.


================================================================================

<PAGE>   2


                                     PART I

                       INCORPORATION OF CONTENTS OF PRIOR
                             REGISTRATION STATEMENTS

      The contents of Registration Statement No. 33-46724 relating to the Noble
Drilling Corporation 1991 Stock Option and Restricted Stock Plan (the "Plan")
filed by the Registrant with the Securities and Exchange Commission (the
"Commission") on April 1, 1992, Registration Statement No. 33-57675 relating to
the Plan filed by the Registrant with the Commission on February 13, 1995, and
Registration Statement No. 333-25857 relating to the Plan filed by the
Registrant with the Commission on April 25, 1997 (together, the "Prior
Registration Statements") are incorporated herein by reference pursuant to
General Instruction E to Form S-8. The purpose of this Registration Statement is
to register 5,000,000 additional shares of Common Stock of the Registrant for
offer and sale pursuant to the Plan.

                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 6. Indemnification of Directors and Officers.

      The Registrant is a Delaware corporation. Under Section 145 of the General
Corporation Law of the State of Delaware, the Registrant has the power to
indemnify its directors and officers, subject to certain limitations.

      Reference is made to Article VI of the Bylaws of the Registrant, which
provides for indemnification of directors and officers of the Registrant under
certain circumstances.

      The Registrant has entered into indemnity agreements with the Registrant's
directors and bylaw officers intended to provide for indemnification to the
fullest extent permitted by law.

      Pursuant to the General Corporation Law of the State of Delaware, the
Certificate of Incorporation of the Registrant limits the personal liability of
the directors of the Registrant to the Registrant or its stockholders for
monetary damages for breach of fiduciary duty under certain circumstances.

      The Registrant also maintains insurance to protect itself and its
directors, officers, employees and agents against expenses, liabilities and
losses incurred by such persons in connection with their service in the
foregoing capacities.

      The foregoing summaries are necessarily subject to the complete text of
the statute, bylaw, agreement, certificate of incorporation and insurance policy
referred to above and are qualified in their entirety by reference thereto.

Item 8. Exhibits.

      In addition to the exhibits filed with or incorporated by reference in the
Prior Registration Statements, the following documents are filed or incorporated
by reference as exhibits to this Registration Statement:

<TABLE>
<CAPTION>
Exhibit Number          Description
- --------------          -----------
<S>                     <C>
4.1                     Noble Drilling Corporation 1991 Stock Option and
                        Restricted Stock Plan, as amended effective as of
                        February 4, 1999.

5.1                     Opinion of Thompson & Knight, A Professional Corporation.

23.1                    Consent of Thompson & Knight, A Professional Corporation
                        (contained in its opinion filed herewith as Exhibit
                        5.1).

23.2                    Consent of PricewaterhouseCoopers LLP.

24.1                    Power of Attorney (included on the signature page of
                        this Registration Statement).
</TABLE>



                                       1
<PAGE>   3

                                   SIGNATURES

      Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-8 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in Houston, Texas on the 10th day of June 1999.

                                        NOBLE DRILLING CORPORATION
                                        (Registrant)

                                        By:   /s/ ROBERT D. CAMPBELL
                                              ----------------------------------
                                              Robert D. Campbell, President

      Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the date indicated.

      Each person whose signature appears below constitutes and appoints James
C. Day and Robert D. Campbell, and each of them (with full power to each of them
to act alone), his true and lawful attorney-in-fact and agent, with full power
of substitution and resubstitution, for him and in his name, place and stead, in
any and all capacities to sign on his behalf individually and in each capacity
stated below any amendment, including post-effective amendments, to this
Registration Statement and any Registration Statement (including any amendment
thereto) for this offering that is to be effective upon filing pursuant to Rule
462(b) under the Securities Act of 1933, as amended, and to file the same, with
all exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission, granting unto said attorneys-in-fact and
agents, and each of them, full power and authority to do and perform each and
every act and thing requisite and necessary to be done in and about the
premises, as fully to all intents and purposes as he might or could do in
person, hereby ratifying and confirming all that said attorneys-in-fact and
agents and either of them, or their substitutes, may lawfully do or cause to be
done by virtue hereof.

<TABLE>
<CAPTION>
Signature                           Title                                            Date
- ---------                           -----                                            ----
<S>                                 <C>                                              <C>
/s/ JAMES C. DAY                    Chairman and Chief Executive                     June 10, 1999
- -----------------------------       Officer and Director
James C. Day                        (Principal Executive Officer)

/s/ BYRON L. WELLIVER               Senior Vice President - Finance,                 June 10, 1999
- -----------------------------       Treasurer and Controller
Byron L. Welliver                   (Principal Financial and Accounting Officer)

/s/ ROBERT D. CAMPBELL              President and Director                           June 10, 1999
- -----------------------------
Robert D. Campbell

/s/ MICHAEL A. CAWLEY               Director                                         June 10, 1999
- -----------------------------
Michael A. Cawley

/s/ LAWRENCE J. CHAZEN              Director                                         June 10, 1999
- -----------------------------
Lawrence J. Chazen

/s/ TOMMY C. CRAIGHEAD              Director                                         June 10, 1999
- -----------------------------
Tommy C. Craighead

/s/ WILLIAM J. DORE                 Director                                         June 10, 1999
- -----------------------------
William J. Dore

/s/ JAMES L. FISHEL                 Director                                         June 10, 1999
- -----------------------------
James L. Fishel

/s/ MARC E. LELAND                  Director                                         June 10, 1999
- -----------------------------
Marc E. Leland


- -----------------------------       Director
William A. Sears
</TABLE>


                                       2
<PAGE>   4

                                INDEX TO EXHIBITS


<TABLE>
<CAPTION>
Exhibit Number          Description
- --------------          -----------
<S>                     <C>
4.1                     Noble Drilling Corporation 1991 Stock Option and
                        Restricted Stock Plan, as amended effective as of
                        February 4, 1999.

5.1                     Opinion of Thompson & Knight, A Professional Corporation.

23.1                    Consent of Thompson & Knight, A Professional Corporation
                        (contained in its opinion filed herewith as Exhibit
                        5.1).

23.2                    Consent of PricewaterhouseCoopers LLP.

24.1                    Power of Attorney (included on the signature page of
                        this Registration Statement).
</TABLE>


<PAGE>   1

                                                                     EXHIBIT 4.1

                          NOBLE DRILLING CORPORATION

                   1991 STOCK OPTION AND RESTRICTED STOCK PLAN

          COMPOSITE COPY REFLECTING AMENDMENTS THROUGH FEBRUARY 4, 1999


    SECTION 1. PURPOSE

    The purpose of this Plan is to assist Noble Drilling Corporation, a Delaware
corporation, in attracting and retaining, as officers and key employees of the
Company and its Affiliates, persons of training, experience and ability and to
furnish additional incentive to such persons by encouraging them to become
owners of Shares of the Company's capital stock, by granting to such persons
Incentive Options, Nonqualified Options, Restricted Stock, or any combination of
the foregoing.


    SECTION 2. DEFINITIONS

    Unless the context otherwise requires, the following words as used herein
shall have the following meanings:

          (a) "Affiliate" means any corporation (other than the Company) in any
    unbroken chain of corporations (i) beginning with the Company if, at the
    time of the granting of the Option or award of Restricted Stock, each of the
    corporations other than the last corporation in the unbroken chain owns
    stock possessing 50 percent or more of the total combined voting power of
    all classes of stock in one of the other corporations in such chain, or (ii)
    ending with the Company if, at the time of the granting of the Option or
    award of Restricted Stock, each of the corporations, other than the Company,
    owns stock possessing 50 percent or more of the total combined voting power
    of all classes of stock in one of the other corporations in such chain.

          (b) "Agreement" means the written agreement (i) between the Company
    and the Optionee evidencing the Option and any SARs that relate to such
    Option granted by the Company and the understanding of the parties with
    respect thereto or (ii) between the Company and a recipient of Restricted
    Stock evidencing the restrictions, terms and conditions applicable to such
    award of Restricted Stock and the understanding of the parties with respect
    thereto.

          (c) "Board" means the Board of Directors of the Company as the same
    may be constituted from time to time.

          (d) "Code" means the Internal Revenue Code of 1986, as amended.

          (e) "Committee" means the Committee provided for in Section 3 of the
    Plan as the same may be constituted from time to time.

          (f) "Company" means Noble Drilling Corporation, a Delaware
    corporation.

          (g) "Corporate Transaction" shall have the meaning as defined in
    Section 8 of the Plan.

          (h) "Disability" means any termination of employment with the Company
    or an Affiliate because of a long-term or total disability, as determined by
    the Committee in its sole discretion.

          (i) "Exchange Act" means the Securities Exchange Act of 1934, as
    amended.

          (j) "Fair Market Value" means the fair market value per Share as
    determined by the Committee in good faith; provided, however, that if a
    Share is listed or admitted to trading on a securities exchange registered
    under the Exchange Act, the Fair Market Value per Share shall be the average
    of the reported high and low sales price on the date in question (or if
    there was no reported sale on such date, on the last preceding date on which
    any reported sale occurred) on the principal securities exchange on which
    such Share is listed or admitted to trading, or if a Share is not listed or
    admitted to trading on any such exchange but is listed as a national market
    security on the National Association of Securities



<PAGE>   2



    Dealers, Inc. Automated Quotations System ("NASDAQ") or any similar system
    then in use, the Fair Market Value per Share shall be the average of the
    reported high and low sales price on the date in question (or if there was
    no reported sale on such date, on the last preceding date on which any
    reported sale occurred) on such system, or if a Share is not listed or
    admitted to trading on any such exchange and is not listed as a national
    market security on NASDAQ but is quoted on NASDAQ or any similar system then
    in use, the Fair Market Value per Share shall be the average of the closing
    high bid and low asked quotations on such system for such Share on the date
    in question. For purposes of valuing Shares to be made subject to Incentive
    Options, the Fair Market Value per Share shall be determined without regard
    to any restriction other than one which, by its terms, will never lapse.

          (k) "Incentive Option" means an Option that is intended to satisfy the
    requirements of Section 422(b) of the Code and Section 17 of the Plan.

          (l) "Non-Employee Director" means a director of the Company who
    satisfies the definition thereof under Rule 16b-3 promulgated under the
    Exchange Act.

          (m) "Nonqualified Option" means an Option that does not qualify as a
    statutory stock option under Section 422 or 423 of the Code.

          (n) "Option" means an option to purchase one or more Shares granted
    under and pursuant to the Plan. Such Option may be either an Incentive
    Option or a Nonqualified Option.

          (o) "Optionee" means a person who has been granted an Option and who
    has executed an Agreement with the Company.

          (p) "Outside Director" means a director of the Company who is an
    outside director within the meaning of Section 162(m) of the Code and the
    regulations promulgated thereunder.

          (q) "Plan" means this Noble Drilling Corporation 1991 Stock Option and
    Restricted Stock Plan, as amended.

          (r) "Restricted Stock" means Shares issued or transferred pursuant to
    Section 20 of the Plan.

          (s) "Retirement" means a termination of employment with the Company or
    an Affiliate either (i) on a voluntary basis by a person who is at least 55
    years of age and has at least five years of continuous service with the
    Company or one or more Affiliates immediately prior to such termination of
    employment or (ii) otherwise with the written consent of the Committee in
    its sole discretion.

          (t) "SARs" means stock appreciation rights granted pursuant to
    Section 7 of the Plan.

          (u) "Securities Act" means the Securities Act of 1933, as amended.

          (v) "Share" means a share of the Company's present common stock, par
    value $.10 per share, and any share or shares of capital stock or other
    securities of the Company hereafter issued or issuable in respect of or in
    substitution or exchange for each such present share. Such Shares may be
    unissued or reacquired Shares, as the Board, in its sole and absolute
    discretion, shall from time to time determine.


    SECTION 3. ADMINISTRATION

    The Plan shall be administered by, and the decisions concerning the Plan
shall be made solely by, a Committee of two or more directors of the Company,
all of whom are (a) Non-Employee Directors and (b) beginning immediately after
the first meeting of stockholders of the Company at which directors are to be
elected that occurs after December 31, 1994, Outside Directors. Each member of
the Committee shall be appointed by and shall serve at the pleasure of the
Board. The Board shall have the sole continuing authority to appoint members of
the Committee. In making grants or awards, the




                                       2
<PAGE>   3


Committee shall take into consideration the contribution the person has made or
may make to the success of the Company or its Affiliates and such other
considerations as the Board may from time to time specify.

    The Committee shall elect one of its members as its chairman and shall hold
its meetings at such times and places as it may determine. A majority of the
members of the Committee shall constitute a quorum. All decisions and
determinations of the Committee shall be made by the majority vote or decision
of the members present at any meeting at which a quorum is present; provided,
however, that any decision or determination reduced to writing and signed by all
members of the Committee shall be as fully effective as if it had been made by a
majority vote or decision at a meeting duly called and held. The Committee may
appoint a secretary (who need not be a member of the Committee) who shall keep
minutes of its meetings. The Committee may make any rules and regulations for
the conduct of its business that are not inconsistent with the express
provisions of the Plan, the bylaws or certificate of incorporation of the
Company or any resolutions of the Board.

    All questions of interpretation or application of the Plan, or of a grant of
an Option and any SARs that relate to such Option or an award of Restricted
Stock, including questions of interpretation or application of an Agreement,
shall be subject to the determination of the Committee, which determination
shall be final and binding upon all parties.

    Subject to the express provisions of the Plan, the Committee shall have the
authority, in its sole and absolute discretion, (a) to adopt, amend or rescind
administrative and interpretive rules and regulations relating to the Plan; (b)
to construe the Plan; (c) to make all other determinations necessary or
advisable for administering the Plan; (d) to determine the terms and provisions
of the respective Agreements (which need not be identical), including provisions
defining or otherwise relating to (i) the term and the period or periods and
extent of exercisability of the Options, (ii) the extent to which the
transferability of Shares issued upon exercise of Options or any SARs that
relate to such Options is restricted, (iii) the effect of termination of
employment upon the exercisability of the Options, and (iv) the effect of
approved leaves of absence (consistent with any applicable regulations of the
Internal Revenue Service) upon the exercisability of such Options; (e) subject
to Sections 9 and 11 of the Plan, to accelerate, for any reason, regardless of
whether the Agreement so provides, the time of exercisability of any Option and
any SARs that relate to such Option that have been granted or the time of the
lapsing of restrictions on Restricted Stock; (f) to construe the respective
Agreements; and (g) to exercise the powers conferred on the Committee under the
Plan. The Board may correct any defect or supply any omission or reconcile any
inconsistency in the Plan in the manner and to the extent it shall deem
expedient to carry it into effect, and it shall be the sole and final judge of
such expediency. The determinations of the Committee or Board, as the case may
be, on the matters referred to in this Section 3 shall be final and conclusive.


    SECTION 4. SHARES SUBJECT TO THE PLAN

          (a) The total number of Shares that may be purchased pursuant to
    Options, issued or transferred pursuant to the exercise of SARs or awarded
    as Restricted Stock shall not exceed 15,700,000 in the aggregate, and the
    total number of shares for which Options and SARs may be granted, and which
    may be awarded as Restricted Stock, to any one person during any continuous
    five-year period shall not exceed 1,500,000 in the aggregate; provided that
    each such maximum number of shares shall be increased or decreased as
    provided in Section 13 of the Plan.

          (b) At any time and from time to time after the Plan takes effect, the
    Committee, pursuant to the provisions herein set forth, may grant Options
    and any SARs that relate to such Options and award Restricted Stock until
    the maximum number of Shares shall be exhausted or the Plan shall be sooner
    terminated; provided, however, that no Incentive Option and any SARs that
    relate to such Option shall be granted after January 29, 2007.

          (c) Shares subject to an Option that expires or terminates prior to
    exercise and Shares that had been previously awarded as Restricted Stock
    that have since been forfeited shall be available for further grant of
    Options or award as Restricted Stock. No Option shall be granted and no
    Restricted Stock shall be awarded if the number of Shares for which Options
    have been granted and which pursuant to this Section are not again available
    for Option grant, plus the number of Shares that have been awarded as
    Restricted Stock, would, if such Option were granted or such Restricted
    Stock were awarded, exceed 15,700,000.



                                       3
<PAGE>   4

          (d) Any Shares withheld pursuant to Section 19(c) of the Plan shall
    not be available after such withholding for being optioned or awarded
    pursuant to the provisions hereof.

          (e) Unless the Shares awarded as Restricted Stock are Shares that have
    been reacquired by the Company as treasury shares, Restricted Stock shall be
    awarded only for services actually rendered, as determined by the Committee.


    SECTION 5. ELIGIBILITY

    The persons who shall be eligible to receive grants of Options and any SARs
that relate to such Options, and to receive awards of Restricted Stock, shall be
regular salaried officers or other employees of the Company or one or more of
its Affiliates.

    SECTION 6. GRANT OF OPTIONS

          (a) From time to time while the Plan is in effect, the Committee may,
    in its sole and absolute discretion, select from among the persons eligible
    to receive a grant of Options under the Plan (including persons who have
    already received such grants of Options) such one or more of them as in the
    opinion of the Committee should be granted Options. The Committee shall
    thereupon, likewise in its sole and absolute discretion, determine the
    number of Shares to be allotted for option to each person so selected.

          (b) Each person so selected shall be offered an Option to purchase the
    number of Shares so allotted to him, upon such terms and conditions,
    consistent with the provisions of the Plan, as the Committee may specify.
    Each such person shall have a reasonable period of time, to be fixed by the
    Committee, within which to accept or reject the proffered Option.
    Failure to accept within the period so fixed may be treated as a rejection.

          (c) Each person who accepts an Option offered to him shall enter into
    an Agreement with the Company, in such form as the Committee may prescribe,
    setting forth the terms and conditions of the Option, whereupon such person
    shall become a participant in the Plan. In the event a person is granted
    both one or more Incentive Options and one or more Nonqualified Options,
    such grants shall be evidenced by separate Agreements, one for each
    Incentive Option grant and one for each Nonqualified Option grant. The date
    on which the Committee completes all action constituting an offer of an
    Option to a person, including the specification of the number of Shares to
    be subject to the Option, shall constitute the date on which the Option
    covered by such Agreement is granted. In no event, however, shall an
    Optionee gain any rights in addition to those specified by the Committee in
    its grant, regardless of the time that may pass between the grant of the
    Option and the actual signing of the Agreement by the Company and the
    Optionee.

          (d) Each Agreement that includes SARs in addition to an Option shall
    comply with the provisions of Section 7 of the Plan.


    SECTION 7. GRANT OF SARS

    The Committee may from time to time grant SARs in conjunction with all or
any portion of any Option either (i) at the time of the initial Option grant
(not including any subsequent modification that may be treated as a new grant of
an Incentive Option for purposes of Section 424(h) of the Code) or (ii) with
respect to Nonqualified Options, at any time after the initial Option grant
while the Nonqualified Option is still outstanding. SARs shall not be granted
other than in conjunction with an Option granted hereunder.

    SARs granted hereunder shall comply with the following conditions and also
with the terms of the Agreement governing the Option in conjunction with which
they are granted:

          (a) The SAR shall expire no later than the expiration of the
    underlying Option.



                                       4
<PAGE>   5

          (b) Upon the exercise of an SAR, the Optionee shall be entitled to
    receive payment equal to the excess of the aggregate Fair Market Value of
    the Shares with respect to which the SAR is then being exercised (determined
    as of the date of such exercise) over the aggregate purchase price of such
    Shares as provided in the related Option. Payment may be made in Shares,
    valued at their Fair Market Value on the date of exercise, or in cash, or
    partly in Shares and partly in cash, as determined by the Committee in its
    sole and absolute discretion.

          (c) SARs shall be exercisable (i) only at such time or times and only
    to the extent that the Option to which they relate shall be exercisable,
    (ii) only when the Fair Market Value of the Shares subject to the related
    Option exceeds the purchase price of the Shares as provided in the related
    Option, and (iii) only upon surrender of the related Option or any portion
    thereof with respect to the Shares for which the SARs are then being
    exercised.

          (d) Upon exercise of an SAR, a corresponding number of Shares subject
    to option under the related Option shall be canceled. Such canceled Shares
    shall be charged against the Shares reserved for the Plan, as provided in
    Section 4 of the Plan, as if the Option had been exercised to such extent
    and shall not be available for future Option grants or Restricted Stock
    awards hereunder.

    SECTION 8. OPTION PRICE

    The option price for each Share covered by an Incentive Option shall not be
less than the greater of (a) the par value of such Share or (b) the Fair Market
Value of such Share at the time such Option is granted. The option price for
each Share covered by a Nonqualified Option shall not be less than the greater
of (a) the par value of such Share or (b) 100 percent of the Fair Market Value
of such Share at the time the Option is granted, except that the minimum option
price may be equal to or greater than 85 percent of the Fair Market Value of
such Share at the time the Option is granted if and to the extent the discount
from Fair Market Value is expressly granted in lieu of a reasonable amount of
salary or cash bonus. Notwithstanding the two immediately preceding sentences,
if the Company or an Affiliate agrees to substitute a new Option under the Plan
for an old Option, or to assume an old Option, by reason of a corporate merger,
consolidation, acquisition of property or stock, separation, reorganization, or
liquidation (any of such events being referred to herein as a "Corporate
Transaction"), the option price of the Shares covered by each such new Option or
assumed Option may be other than the Fair Market Value of the Shares at the time
the Option is granted as determined by reference to a formula, established at
the time of the Corporate Transaction, which will give effect to such
substitution or assumption; provided, however, in no event shall:

          (a) the excess of the aggregate Fair Market Value of the Shares
    subject to the Option immediately after the substitution or assumption over
    the aggregate option price of such Shares be more than the excess of the
    aggregate Fair Market Value of all Shares subject to the Option immediately
    prior to the substitution or assumption over the aggregate option price of
    such Shares;

          (b) in the case of an Incentive Option, the new Option or the
    assumption of the old Option give the Optionee additional benefits that he
    would not have under the old Option; or

          (c) the ratio of the option price to the Fair Market Value of the
    stock subject to the Option immediately after the substitution or assumption
    be more favorable to the Optionee than the ratio of the option price to the
    Fair Market Value of the stock subject to the old Option immediately prior
    to such substitution or assumption, on a Share by Share basis.

Notwithstanding the above, the provisions of this Section 8 with respect to the
option price in the event of a Corporate Transaction shall, in the case of an
Incentive Option, be subject to the requirements of Section 424(a) of the Code
and the Treasury regulations and revenue rulings promulgated thereunder. In the
case of an Incentive Option, in the event of a conflict between the terms of
this Section 8 and the above cited statute, regulations and rulings, or in the
event of an omission in this Section 8 of a provision required by said laws, the
latter shall control in all respects and are hereby incorporated herein by
reference as if set out at length.


                                       5
<PAGE>   6

    SECTION 9. OPTION PERIOD AND TERMS OF EXERCISE

          (a) Each Option shall be exercisable during such period of time as the
    Committee may specify, but in no event for longer than 10 years from the
    date when the Option is granted; provided, however, that

                (i) All rights to exercise an Option and any SARs that relate to
          such Option shall, subject to the provisions of subsection (c) of this
          Section 9, terminate six months after the date the Optionee ceases to
          be employed by at least one of the employers in the group of employers
          consisting of the Company and its Affiliates, for any reason other
          than death, Disability or Retirement, except that, in the event of the
          termination of employment of the Optionee on account of fraud,
          dishonesty or other acts detrimental to the interests of the Company
          or one or more of its Affiliates, the Option and any SARs that relate
          to such Option shall thereafter be null and void for all purposes.
          Employment shall not be deemed to have ceased by reason of the
          transfer of employment, without interruption of service, between or
          among the Company and any of its Affiliates. In addition, for purposes
          of this Plan, employment shall not be deemed to have ceased by reason
          of the termination of employment with the Company or an Affiliate,
          followed by a reemployment with the Company or an Affiliate within six
          months of such initial termination, provided such reemployment is
          approved for purposes of this Section 9(a)(i) by the Committee in its
          sole discretion, of (x) a person whose employment terminated initially
          in December 1996 in connection with the sale by the Company and its
          Affiliates of their land drilling assets to Nabors Industries, Inc.
          and its affiliates and (y) any person not otherwise provided for in
          clause (x) immediately preceding.

                (ii) If the Optionee ceases to be employed by at least one of
          the employers in the group of employers consisting of the Company
          and its Affiliates, by reason of his death, Disability or Retirement,
          all rights to exercise such Option and any SARs that relate to such
          Option shall, subject to the provisions of subsection (c) of this
          Section 9, terminate five years thereafter.

          (b) If an Option is granted with a term shorter than 10 years, the
    Committee may extend the term of the Option and any SARs that relate to such
    Option, but for not more than 10 years from the date when the Option was
    originally granted.

          (c) In no event may an Option or any SARs that relate to such Option
    be exercised after the expiration of the term thereof.


    SECTION 10. OPTIONS AND SARS NOT TRANSFERABLE

    No Option or any SARs that relate to such Option shall be transferable by
the Optionee otherwise than by will or the applicable laws of descent and
distribution.


    SECTION 11. EXERCISE OF OPTIONS AND SARS

          (a) During the lifetime of an Optionee, only such Optionee may
    exercise an Option or any SARs that relate to such Option granted to him. In
    the event of his death, any then exercisable portion of his Option and any
    SARs that relate to such Option may, within five years thereafter, or
    earlier date of termination of the Option, be exercised in whole or in part
    by the duly authorized representative of the deceased Optionee's estate.

          (b) At any time, and from time to time, during the period when any
    Option and any SARs that relate to such Option, or a portion thereof, are
    exercisable, such Option or SARs, or portion thereof, may be exercised in
    whole or in part; provided, however, that the Committee may require any
    Option or SAR that is partially exercised to be so exercised with respect to
    at least a stated minimum number of Shares.

          (c) Each exercise of an Option, or a portion thereof, shall be
    evidenced by a notice in writing to the Company accompanied by payment in
    full of the option price of the Shares then being purchased. Payment in full
    shall mean payment of the full amount due, either in cash, by certified
    check or cashier's check, or, with the consent of the


                                       6
<PAGE>   7

    Committee, with Shares owned by the Optionee, including an actual or deemed
    multiple series of exchanges of such Shares.

          Notwithstanding anything contained herein to the contrary, at the
    request of an Optionee and to the extent permitted by applicable law, the
    Committee may, in its sole and absolute discretion, selectively approve
    arrangements with a brokerage firm or firms under which any such brokerage
    firm shall, on behalf of the Optionee, make payment in full to the Company
    of the option price of the Shares then being purchased, and the Company,
    pursuant to an irrevocable notice in writing from the Optionee, shall make
    prompt delivery of one or more certificates for the appropriate number of
    Shares to such brokerage firm. Payment in full for purposes of the
    immediately preceding sentence shall mean payment of the full amount due,
    either in cash or by certified check or cashier's check.

          (d) Each exercise of SARs, or a portion thereof, shall be evidenced by
    a notice in writing to the Company.

          (e) No Shares shall be issued upon exercise of an Option until full
    payment therefor has been made, and an Optionee shall have none of the
    rights of a stockholder until Shares are issued to him.

          (f) Nothing herein or in any Agreement shall require the Company to
    issue any Shares upon exercise of an Option or SAR if such issuance would,
    in the opinion of counsel for the Company, constitute a violation of the
    Securities Act or any similar or superseding statute or statutes, or any
    other applicable statute or regulation, as then in effect. Upon the exercise
    of an Option or SAR (as a result of which the Optionee receives Shares), or
    portion thereof, the Optionee shall give to the Company satisfactory
    evidence that he is acquiring such Shares for the purposes of investment
    only and not with a view to their distribution; provided, however, if or to
    the extent that the Shares delivered to the Optionee shall be included in a
    registration statement filed by the Company under the Securities Act, such
    investment representation shall be abrogated.


    SECTION 12. DELIVERY OF STOCK CERTIFICATES

    As promptly as may be practicable after an Option or SAR (as a result of the
exercise of which the Optionee receives Shares), or a portion thereof, has been
exercised as hereinabove provided, the Company shall make delivery of one or
more certificates for the appropriate number of Shares. In the event that an
Optionee exercises both (i) an Incentive Option or SARs that relate to such
Option (as a result of which the Optionee receives Shares), or a portion
thereof, and (ii) a Nonqualified Option or SARs that relate to such Option (as a
result of which the Optionee receives Shares), or a portion thereof, separate
stock certificates shall be issued, one for the Shares subject to the Incentive
Option and one for the Shares subject to the Nonqualified Option.


    SECTION 13. CHANGES IN COMPANY'S SHARES AND CERTAIN CORPORATE TRANSACTIONS

    If at any time while the Plan is in effect there shall be any increase or
decrease in the number of issued and outstanding Shares of the Company effected
without receipt of consideration therefor by the Company, through the
declaration of a stock dividend or through any recapitalization or merger or
otherwise in which the Company is the surviving corporation, resulting in a
stock split-up, combination or exchange of Shares of the Company, then and in
each such event:

          (a) An appropriate adjustment shall be made in the maximum number of
    Shares then subject to being optioned or awarded as Restricted Stock under
    the Plan, to the end that the same proportion of the Company's issued and
    outstanding Shares shall continue to be subject to being so optioned and
    awarded;

          (b) Appropriate adjustment shall be made in the number of Shares and
    the option price per Share thereof then subject to purchase pursuant to each
    Option previously granted and then outstanding, to the end that the same
    proportion of the Company's issued and outstanding Shares in each such
    instance shall remain subject to purchase at the same aggregate option
    price; and



                                       7
<PAGE>   8

          (c) In the case of Incentive Options, any such adjustments shall in
    all respects satisfy the requirements of Section 424(a) of the Code and the
    Treasury regulations and revenue rulings promulgated thereunder.

    Except as is otherwise expressly provided herein, the issue by the Company
of shares of its capital stock of any class, or securities convertible into
shares of capital stock of any class, either in connection with a direct sale or
upon the exercise of rights or warrants to subscribe therefor, or upon
conversion of shares or obligations of the Company convertible into such shares
or other securities, shall not affect, and no adjustment by reason thereof shall
be made with respect to, the number of or option price of Shares then subject to
outstanding Options granted under the Plan. Furthermore, the presence of
outstanding Options granted under the Plan shall not affect in any manner the
right or power of the Company to make, authorize or consummate (i) any or all
adjustments, recapitalizations, reorganizations or other changes in the
Company's capital structure or its business; (ii) any merger or consolidation of
the Company; (iii) any issue by the Company of debt securities or preferred
stock that would rank above the Shares subject to outstanding Options granted
under the Plan; (iv) the dissolution or liquidation of the Company; (v) any
sale, transfer or assignment of all or any part of the assets or business of the
Company; or (vi) any other corporate act or proceeding, whether of a similar
character or otherwise.


    SECTION 14. EFFECTIVE DATE

    The Plan was originally adopted by the Board on January 31, 1991 and
approved by the stockholders of the Company on April 25, 1991. The Plan was
amended and restated by the Board on January 30, 1997 and approved by the
stockholders of the Company on April 24, 1997. The amendments to the Plan
adopted by the Board on February 4, 1999 shall be effective as of that date, but
shall be submitted to the stockholders of the Company for approval and
ratification at the next regular or special meeting thereof to be held after
December 31, 1998. If at such a meeting of the stockholders of the Company a
quorum is present, such amendments to the Plan shall be presented for approval
and ratification, and unless at such a meeting such amendments are approved and
ratified by the affirmative vote of a majority of the outstanding shares of
common stock, par value $.10 per share, of the Company present in person or by
proxy and entitled to vote, then, and in such event, the amendments to the Plan
adopted by the Board on February 4, 1999 and any then outstanding Options (and
any SARs that relate to such Options) that may have been conditionally granted
prior to such stockholder meeting dependent upon an increase in the number of
Shares subject to the Plan shall become null and void and of no further force or
effect. No award of Restricted Stock dependent upon an increase in the number of
Shares subject to the Plan shall be made prior to the approval and ratification
of such amendments to the Plan.

    SECTION 15. AMENDMENT, SUSPENSION OR TERMINATION

    The Board may at any time amend, suspend or terminate the Plan; provided,
however, that after the stockholders have approved and ratified the Plan in
accordance with Section 14 of the Plan, the Board may not, without approval of
the stockholders of the Company, amend the Plan so as to (a) increase the
maximum number of Shares subject thereto, as specified in Sections 4(a) and 13
of the Plan, (b) reduce the option price for Shares covered by Options granted
hereunder below the price specified in Section 8 of the Plan or (c) permit the
"repricing" of Options and any SARs that relate to such new Options in
contravention of Section 18 of the Plan; and provided further, that the Board
may not modify, impair or cancel any outstanding Option or SAR that relates to
such Option, or the restrictions, terms or conditions applicable to Shares of
Restricted Stock, without the consent of the holder thereof.


    SECTION 16. REQUIREMENTS OF LAW

    Notwithstanding anything contained herein or in any Agreement to the
contrary, the Company shall not be required to sell or issue Shares under any
Option or SAR if the issuance thereof would constitute a violation by the
Optionee or the Company of any provision of any law or regulation of any
governmental authority or any national securities exchange; and as a condition
of any sale or issuance of Shares upon exercise of an Option or SAR, the Company
may require such agreements or undertakings, if any, as the Company may deem
necessary or advisable to assure compliance with any such law or regulation.



                                       8
<PAGE>   9

    SECTION 17. INCENTIVE OPTIONS

    The Committee may, in its sole and absolute discretion, designate any Option
granted under the Plan as an Incentive Option intended to qualify under Section
422(b) of the Code. Any provision of the Plan to the contrary notwithstanding,
(a) no Incentive Option shall be granted to any person who, at the time such
Incentive Option is granted, owns stock possessing more than 10 percent of the
total combined voting power of all classes of stock of the Company or any
Affiliate unless the option price under such Incentive Option is at least 110
percent of the Fair Market Value of the Shares subject to the Incentive Option
at the date of its grant and such Incentive Option is not exercisable after the
expiration of five years from the date of its grant; and (b) the aggregate Fair
Market Value of the Shares subject to an Incentive Option and the aggregate Fair
Market Value of the shares of stock of the Company or any Affiliate (or a
predecessor corporation of the Company or an Affiliate) subject to any other
incentive stock option (within the meaning of Section 422(b) of the Code) of the
Company and its Affiliates (or a predecessor corporation of any such
corporation), that may become first exercisable in any calendar year, shall not
(with respect to any Optionee) exceed $100,000, determined as of the date the
Incentive Option is granted.


    SECTION 18. MODIFICATION OF OPTIONS AND SARS

    Subject to the terms and conditions of and within the limitations of the
Plan, the Committee may modify, extend or renew outstanding Options and any SARs
that relate to such Options granted under the Plan. The Committee shall not have
authority to accept the surrender or cancellation of any Options and any SARs
that relate to such Options outstanding hereunder (to the extent not theretofore
exercised) and grant new Options and any SARs that relate to such new Options
hereunder in substitution therefor (to the extent not theretofore exercised) at
an Option Price that is less than the Option Price of the Options surrendered or
cancelled. Notwithstanding the foregoing provisions of this Section 18, no
modification of an outstanding Option and any SARs that relate to such Option
granted hereunder shall, without the consent of the Optionee, alter or impair
any rights or obligations under any Option and any SARs that relate to such
Option theretofore granted hereunder to such Optionee, except as may be
necessary, with respect to Incentive Options, to satisfy the requirements of
Section 422(b) of the Code.


    SECTION 19. AGREEMENT PROVISIONS

          (a) Each Agreement shall contain such provisions (including, without
    limitation, restrictions or the removal of restrictions upon the exercise of
    the Option and any SARs that relate to such Option and the transfer of
    shares thereby acquired) as the Committee shall deem advisable. Each
    Agreement relating to an Option shall identify the Option evidenced thereby
    as an Incentive Option or Nonqualified Option, as the case may be. Incentive
    Options and Nonqualified Options may not both be covered by a single
    Agreement. Each such Agreement relating to Incentive Options shall contain
    such limitations and restrictions upon the exercise of the Incentive Option
    as shall be necessary for the Incentive Option to which such Agreement
    relates to constitute an incentive stock option, as defined in Section
    422(b) of the Code.

          (b) Each Agreement shall recite that it is subject to the Plan and
    that the Plan shall govern where there is any inconsistency between the Plan
    and the Agreement.

          (c) Each Agreement shall contain a covenant by the Optionee, in such
    form as the Committee may require in its discretion, that he consents to and
    will take whatever affirmative actions are required, in the opinion of the
    Committee, to enable the Company or appropriate Affiliate to satisfy its
    Federal income tax and FICA and any applicable state and local withholding
    obligations. An Agreement may contain such provisions as the Committee deems
    appropriate to enable the Company or its Affiliates to satisfy such
    withholding obligations, including provisions permitting the Company, upon
    the exercise of an Option or SAR (as a result of which the Optionee receives
    Shares), to withhold Shares otherwise issuable to the Optionee exercising
    the Option or SAR, or to accept delivery of Shares owned by the Optionee, to
    satisfy the applicable withholding obligations.



                                       9
<PAGE>   10

          (d) Each Agreement relating to an Incentive Option shall contain a
    covenant by the Optionee immediately to notify the Company in writing of any
    disqualifying disposition (within the meaning of Section 421(b) of the Code)
    of Shares received upon the exercise of an Incentive Option.


    SECTION 20. RESTRICTED STOCK

          (a) Subject to the provisions of Section 14 of the Plan, the Committee
    may from time to time, in its sole and absolute discretion, award Shares of
    Restricted Stock to such persons as it shall select from among those persons
    who are eligible under Section 5 of the Plan to receive awards of Restricted
    Stock. Any award of Restricted Stock shall be made from Shares subject
    hereto as provided in Section 4 of the Plan.

          (b) A Share of Restricted Stock shall be subject to such restrictions,
    terms and conditions, including forfeitures, if any, as may be determined by
    the Committee, which may include, without limitation, the rendition of
    services to the Company or its Affiliates for a specified time or the
    achievement of specific goals, and to the further restriction that no such
    Share may be sold, assigned, transferred, discounted, exchanged, pledged or
    otherwise encumbered or disposed of until the terms and conditions set by
    the Committee at the time of the award of the Restricted Stock have been
    satisfied. Each recipient of an award of Restricted Stock shall enter into
    an Agreement with the Company, in such form as the Committee shall
    prescribe, setting forth the restrictions, terms and conditions of such
    award, whereupon such recipient shall become a participant in the Plan;
    provided, however, that the minimum restriction period shall be three years
    from the date of award (one year in the case of Shares of Restricted Stock
    awarded with performance-based conditions); and provided further, that up to
    50 percent of the Shares of Restricted Stock awarded under an Agreement that
    have not previously vested may be made subject to vesting annually
    commencing with the first anniversary of the award.

          If a person is awarded Shares of Restricted Stock, whether or not
    escrowed as provided below, the person shall be the record owner of such
    Shares and shall have all the rights of a stockholder with respect to such
    Shares (unless the escrow agreement, if any, specifically provides
    otherwise), including the right to vote and the right to receive dividends
    or other distributions made or paid with respect to such Shares. Any
    certificate or certificates representing Shares of Restricted Stock shall
    bear a legend similar to the following:

                The shares represented by this certificate have been issued
          pursuant to the terms of the Noble Drilling Corporation 1991 Stock
          Option and Restricted Stock Plan and may not be sold, assigned,
          transferred, discounted, exchanged, pledged or otherwise encumbered or
          disposed of in any manner except as set forth in the terms of the
          agreement embodying the award of such shares dated       , 19  .

          In order to enforce the restrictions, terms and conditions that may be
    applicable to a person's Shares of Restricted Stock, the Committee may
    require the person, upon the receipt of a certificate or certificates
    representing such Shares, or at any time thereafter, to deposit such
    certificate or certificates, together with stock powers and other
    instruments of transfer, appropriately endorsed in blank, with the Company
    or an escrow agent designated by the Company under an escrow agreement in
    such form as by the Committee shall prescribe.

          After the satisfaction of the restrictions, terms and conditions set
    by the Committee at the time of an award of Restricted Stock to a person, a
    new certificate, without the legend set forth above, for the number of
    Shares that are no longer subject to such restrictions, terms and conditions
    shall be delivered to the person.

          If a person to whom Restricted Stock has been awarded dies after
    satisfaction of the restrictions, terms and conditions for the payment of
    all or a portion of the award but prior to the actual payment of all or such
    portion thereof, such payment shall be made to the person's beneficiary or
    beneficiaries at the time and in the same manner that such payment would
    have been made to the person.

          The Committee shall have the authority (and the Agreement evidencing
    an award of Restricted Stock may so provide) to cancel all or any portion of
    any outstanding restrictions prior to the expiration of such restrictions
    with



                                       10
<PAGE>   11

    respect to any or all of the Shares of Restricted Stock awarded to a person
    hereunder on such terms and conditions as the Committee may deem
    appropriate.

          (c) Without limiting the provisions of the first paragraph of
    subsection (b) of this Section 20, if a person to whom Restricted Stock has
    been awarded ceases to be employed by at least one of the employers in the
    group of employers consisting of the Company and its Affiliates, for any
    reason, prior to the satisfaction of any terms and conditions of an award,
    any Restricted Stock remaining subject to restrictions shall thereupon be
    forfeited by the person and transferred to, and reacquired by, the Company
    or an Affiliate at no cost to the Company or the Affiliate; provided,
    however, if the cessation is due to the person's death, Retirement or
    Disability, the Committee may, in its sole and absolute discretion, deem
    that the terms and conditions have been met for all or part of such
    remaining portion. In the event of such forfeiture, the person, or in the
    event of his death, his personal representative, shall forthwith deliver to
    the Secretary of the Company the certificates for the Shares of Restricted
    Stock remaining subject to such restrictions, accompanied by such
    instruments of transfer, if any, as may reasonably be required by the
    Secretary of the Company.

          (d) In case of any consolidation or merger of another corporation into
    the Company in which the Company is the surviving corporation and in which
    there is a reclassification or change (including a change to the right to
    receive cash or other property) of the Shares (other than a change in par
    value, or from par value to no par value, or as a result of a subdivision or
    combination, but including any change in such shares into two or more
    classes or series of shares), the Committee may provide that payment of
    Restricted Stock shall take the form of the kind and amount of shares of
    stock and other securities (including those of any new direct or indirect
    parent of the Company), property, cash or any combination thereof receivable
    upon such consolidation or merger.


    SECTION 21. GENERAL

          (a) The proceeds received by the Company from the sale of Shares
    pursuant to Options shall be used for general corporate purposes.

          (b) Nothing contained in the Plan or in any Agreement shall confer
    upon any Optionee or recipient of Restricted Stock the right to continue in
    the employ of the Company or any Affiliate, or interfere in any way with the
    rights of the Company or any Affiliate to terminate his employment at any
    time, with or without cause.

          (c) Neither the members of the Board nor any member of the Committee
    shall be liable for any act, omission or determination taken or made in good
    faith with respect to the Plan or any Option and any SARs that relate to
    such Option granted hereunder or any Restricted Stock awarded hereunder; and
    the members of the Board and the Committee shall be entitled to
    indemnification and reimbursement by the Company in respect of any claim,
    loss, damage or expenses (including counsel fees) arising therefrom to the
    full extent permitted by law and under any directors' and officers'
    liability or similar insurance coverage that may be in effect from time to
    time.

          (d) Any payment of cash or any issuance or transfer of Shares to the
    Optionee, or to his legal representative, heir, legatee or distributee, in
    accordance with the provisions hereof, shall, to the extent thereof, be in
    full satisfaction of all claims of such persons hereunder. The Committee may
    require any Optionee, legal representative, heir, legatee or distributee, as
    a condition precedent to such payment, to execute a release and receipt
    therefor in such form as it shall determine.

          (e) Neither the Committee, the Board nor the Company guarantees the
    Shares from loss or depreciation.

          (f) All expenses incident to the administration, termination or
    protection of the Plan, including, but not limited to, legal and accounting
    fees, shall be paid by the Company or its Affiliates.

          (g) Records of the Company and its Affiliates regarding a person's
    period of employment, termination of employment and the reason therefor,
    leaves of absence, re-employment and other matters shall be conclusive for
    all purposes hereunder, unless determined by the Committee to be incorrect.



                                       11
<PAGE>   12

          (h) Any action required of the Company shall be by resolution of its
    Board or by a person authorized to act by resolution of the Board. Any
    action required of the Committee shall be by resolution of the Committee or
    by a person authorized to act by resolution of the Committee.

          (i) If any provision of the Plan or any Agreement is held to be
    illegal or invalid for any reason, the illegality or invalidity shall not
    affect the remaining provisions of the Plan or such Agreement, as the case
    may be, but such provision shall be fully severable and the Plan or such
    Agreement, as the case may be, shall be construed and enforced as if the
    illegal or invalid provision had never been included herein or therein.

          (j) Whenever any notice is required or permitted hereunder, such
    notice must be in writing and personally delivered or sent by mail. Any
    notice required or permitted to be delivered hereunder shall be deemed to be
    delivered on the date on which it is personally delivered, or, whether
    actually received or not, on the third business day after it is deposited in
    the United States mail, certified or registered, postage prepaid, addressed
    to the person who is to receive it at the address which such person has
    theretofore specified by written notice delivered in accordance herewith.
    The Company, an Optionee or a recipient of Restricted Stock may change, at
    any time and from time to time, by written notice to the other, the address
    that it or he had theretofore specified for receiving notices. Until changed
    in accordance herewith, the Company and each Optionee and recipient of
    Restricted Stock shall specify as its and his address for receiving notices
    the address set forth in the Agreement pertaining to the Shares to which
    such notice relates.

          (k) Any person entitled to notice hereunder may waive such notice.

          (l) The Plan shall be binding upon the Optionee or recipient of
    Restricted Stock, his heirs, legatees, distributees and legal
    representatives, upon the Company, its successors and assigns, and upon the
    Committee, and its successors.

          (m) The titles and headings of Sections and paragraphs are included
    for convenience of reference only and are not to be considered in the
    construction of the provisions hereof.

          (n) All questions arising with respect to the provisions of the Plan
    shall be determined by application of the laws of the State of Texas except
    to the extent Texas law is preempted by Federal law.

          (o) Words used in the masculine shall apply to the feminine where
    applicable, and wherever the context of the Plan dictates, the plural shall
    be read as the singular and the singular as the plural.




                                       12


<PAGE>   1

                                                                     EXHIBIT 5.1

                     [Letterhead of Thompson & Knight, P.C.]



                                  June 10, 1999


Noble Drilling Corporation
10370 Richmond Avenue, Suite 400
Houston, Texas  77042

Dear Sirs:

         We have acted as counsel for Noble Drilling Corporation, a Delaware
corporation (the "Company"), in connection with the registration under the
Securities Act of 1933 (the "Securities Act") of 5,000,000 shares (the "Shares")
of common stock, par value $.10 per share, of the Company for issuance pursuant
to the Company's 1991 Stock Option and Restricted Stock Plan (the "Plan").

         In connection with the foregoing, we have examined the originals or
copies, certified or otherwise authenticated to our satisfaction, of such
corporate records of the Company, agreements and other instruments, certificates
of public officials and of officers of the Company, and other instruments and
documents as we have deemed necessary to require as a basis for the opinion
hereinafter expressed. We have also participated in the preparation of the
Company's Registration Statement on Form S-8 (the "Registration Statement") to
be filed with the Securities and Exchange Commission relating to the
registration of the Shares under the Securities Act.

         On the basis of the foregoing, we advise you that, in our opinion, the
Shares have been duly authorized by the Company and, when issued upon the due
exercise of options or stock appreciation rights duly granted under the Plan or
upon the due award as restricted stock under the Plan, will be legally issued,
fully paid and nonassessable.

         We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to all references to us in the Registration
Statement. In giving this consent, we do not thereby admit that we come within
the category of persons whose consent is required under Section 7 of the
Securities Act, or the rules or regulations of the Securities and Exchange
Commission thereunder.

                                     Sincerely,

                                     THOMPSON & KNIGHT,
                                     A Professional Corporation


                                     By: /s/ DAVID L. EMMONS
                                         ---------------------------------------
                                         David L. Emmons, Attorney


<PAGE>   1
                                                                    EXHIBIT 23.2


                       CONSENT OF INDEPENDENT ACCOUNTANTS


         We hereby consent to the incorporation by reference in this
Registration Statement on Form S-8 of our report dated February 4, 1999 relating
to the consolidated financial statements, which appears in Noble Drilling
Corporation's Annual Report on Form 10-K for the year ended December 31, 1998.


PRICEWATERHOUSECOOPERS LLP

Houston, Texas
June 10, 1999



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