CLIFFS DRILLING CO
SC 13G/A, 1995-11-13
DRILLING OIL & GAS WELLS
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549



                                  SCHEDULE 13G



                   Under the Securities Exchange Act of 1934

                             (Amendment No.  1  )*


                            CLIFFS DRILLING COMPANY
                                (Name of Issuer)


                                  COMMON STOCK
                         (Title of Class of Securities)


                                   18682C100
                                 (CUSIP Number)


Check the following box if a fee is being paid with this statement [    ].  (A
fee is not required only if the filing person:  (1) has a previous statement on
file reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7).

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

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



                               Page 1 of 6 pages
<PAGE>   2

CUSIP No. 18682C100                13G                  Page  2  of  6



1.  NAME OF REPORTING PERSON
      S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                 HEARTLAND ADVISORS, INC.

                 #39-1078128

2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                            (a)  [      ]
                                                            (b)  [      ]

3.  SEC USE ONLY

4.  CITIZENSHIP OR PLACE OF ORGANIZATION

                 WISCONSIN, U.S.A.

         NUMBER OF           5.  SOLE VOTING POWER
           SHARES                84,100
        BENEFICIALLY 
          OWNED BY                                        
            EACH             6.  SHARED VOTING POWER      
         REPORTING           None                         
           PERSON                                         
            WITH                                          
                             7.  SOLE DISPOSITIVE POWER   
                                 746,900                 
                                                         

                             8.  SHARED DISPOSITIVE POWER
                             None


9.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

         746,900

10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*



11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

         18.2%

12.  TYPE OF REPORTING PERSON*

                 IA

<PAGE>   3

CUSIP No. 18682C100                 13G                         Page  3  of 6



1.  NAME OF REPORTING PERSON
      S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                 HEARTLAND GROUP, INC.

                 #39-1572323

2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

                                                            (a)  [      ]
                                                            (b)  [      ]

3.  SEC USE ONLY

4.  CITIZENSHIP OR PLACE OF ORGANIZATION

                 MARYLAND, U.S.A.

          NUMBER OF          5.  SOLE VOTING POWER
           SHARES            350,000
        BENEFICIALLY 
          OWNED BY                                        
            EACH             6.  SHARED VOTING POWER      
         REPORTING           None                         
           PERSON                                         
            WITH                                          
                             7.  SOLE DISPOSITIVE POWER   
                             None                         
                                                          

                             8.  SHARED DISPOSITIVE POWER
                             None


9.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

         350,000

10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*



11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

         8.5%

12.  TYPE OF REPORTING PERSON*

                 IV

<PAGE>   4

CUSIP NUMBER  18682C100                                  Page 4 Of 6 Pages

Item 1.
         (a) Name of Issuer:  Cliffs Drilling Company

         (b) Address of Issuer's Principal Executive Offices:
             300 Citicorp Center
             Houston, TX 77002
Item 2.
         (a) Name of Person Filing:        Heartland Advisors, Inc.
                                           Heartland Group, Inc.

         (b) Address of Principal Business Office:
                 Heartland Advisors, Inc.
                 790 North Milwaukee Street
                 Milwaukee, WI  53202

                 Heartland Group, Inc.
                 790 North Milwaukee Street
                 Milwaukee, WI  53202

         (c) Citizenship:         Heartland Advisors is a Wisconsin corporation.
                                  Heartland Group is a Maryland corporation.

         (d) Title of Class of Securities:         Common Stock

         (e)  CUSIP Number: 18682C100

Item 3. If this statement is filed pursuant to Rule 13d-1(b),
         or 13d-2(b), check whether the person filing is a: 

    (a)_____     Broker or Dealer registered under Section 15 of
                    the Act.

    (b)_____     Bank as defined in Section 3(a)(6) of
                    the Act.

    (c)_____     Insurance company as defined in Section 3(a)(19)
                    of the Act.

    (d)__X__     Investment company registered under Section 8 of
                    the Investment Company Act of 1940 with respect to 
                    Heartland Group.

    (e)__X__     Investment adviser registered under Section 203 of
                    the Investment Advisers Act of 1940 with respecct to 
                    Heartland Advisors.

    (f)_____     Employee Benefit Plan, Pension Fund which is subject
                    to the provisions of the Employee Retirement
                    Income Security Act of 1974 or Endowment Fund;  see
                    Sec 240.13d-1(b)(1)(ii)(F).

<PAGE>   5


    (g)_____     Parent Holding Company, in accordance with
                 Sec 240.13d-1(b)(ii)(G) (Note:  See Item 1).


    (h)_____     Group, in accordance with
                 Sec 240.13d-1(b)(1)(ii)(H).

Item 4. Ownership.

        (a)   Amount beneficially owned:  
              746,900 shares are beneficially owned within the meaning of
              Rule 13d-3 of the Securities Exchange Act of 1934 by Heartland
              Advisors;  350,000 shares of which are also beneficially owned by
              Heartland Group within the meaning of the Rule.




        (b)   Percent of Class:

              18.2% by Heartland Advisors, of which 8.5% is also held by
              Heartland Group.

        (c)   For information on voting and dispositive power with respect 
to the above listed shares, see Items 5-8 of the Cover Pages.


Item 5. Ownership of Five Percent or Less of a Class.

              If this statement is being filed to report the fact that as
of the date hereof the reporting person has ceased to be the
beneficial owner of more than five percent of the class of
securities, check the following:[  ]


Item 6. Ownership of more than Five Percent on Behalf of Another
         Person.

         The shares of common stock are held in investment advisory accounts of
Heartland Advisors.  As a result, various persons have the right to receive or
the power to direct the receipt of dividends from, or the proceeds from the
sale of, the securities.  As reported herein, the interests of one such
account, Heartland Group, Inc., a series investment company for which Heartland
Advisors serves as investment advisor, relates to more than 5% of the class.


Item 7. Identification and Classification of the Subsidiary Which Acquired the
Security Being Reported on By the Parent Holding Company.

              Not Applicable.

Item 8. Identification and Classification of Members of the Group.

              Not Applicable.

Item 9. Notice of Dissolution of Group.

              Not Applicable.

<PAGE>   6


Item 10.  Certification.

              By signing below, I certify that, to the best of my knowledge and
belief, the securities referred to above were acquired in the ordinary course
of business and were not acquired for the purpose of and do not have the effect
of changing or influencing the control of the issuer of such securities and
were not acquired in connection with or as a participant in any transaction
having such purposes or effect.

                                   SIGNATURE

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

DATE:   November 9, 1995

                            HEARTLAND ADVISORS, INC.

                            By:     PATRICK J. RETZER
                               -----------------------------
                                    Patrick J. Retzer
                                    Vice President/Treasurer


                            HEARTLAND GROUP, INC.

                            By:     PATRICK J. RETZER
                               -----------------------------
                                    Patrick J. Retzer
                                    Vice President/Treasurer



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