LETTER FROM THE INDEPENDENT BOARD COMMITTEE



                            COSL
                             中海油田服务股份有限公司
                             China Oilfield Services Limited
         (Incorporated in the People's Republic of China as a joint stock limited liability company)
                                           (Stock Code: 2883)

                                                                                                            9 November 2022

To the Independent Shareholders

Dear Sir or Madam,

     CONTINUING CONNECTED TRANSACTIONS - ENTERING INTO THE
            MASTER SERVICES FRAMEWORK AGREEMENT

       We have been appointed to form the Independent Board Committee to consider and advise the
Independent Shareholders as to whether, in our opinion, the terms, the Proposed Annual Caps of and the
transactions contemplated under the Framework Agreement are fair and reasonable, on normal commercial
terms or better and in the ordinary and usual course of business of the Group, and are in the interests of the
Company and its Shareholders as a whole and how to vote.

       Having considered the above and the advice of the Independent Financial Adviser in relation thereto
as set out on pages 33 to 50 of this circular, we are of the opinion that the terms, the Proposed Annual Caps
of and the transactions contemplated under the Framework Agreement are fair and reasonable, on normal
commercial terms or better and in the ordinary and usual course of business of the Group, and are in the
interests of the Company and its Shareholders as a whole.

       Accordingly, we recommend the Independent Shareholders to vote in favour of and approve all
resolution(s) in relation to the above Framework Agreement to be proposed at the Second EGM

                                                               Yours faithfully,
                                                             For and on behalf of
                                                        The Independent Board Committee of
                                                           China Oilfield Services Limited




                      c   h iu   L a   .
                                       I
                                           k u e   兀
                                                          ln
                                                               su    s an n a
                                                                    d ep e n d e   n    s
                                                                                            a r r y   伽队
                                                                                                        。
                                                                                                      y a   x   i n