Sinopec Oilfield Service : Resignation of Non-Executive Director, Changes in Chief Financial Officer and Supervisor, Appointment of Chairman, Appointment of the Chairman of the Supervisory Committee

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Sinopec Oilfield Service Corporation

(a joint stock limited company established in the People's Republic of China)

(Stock code: 1033)

Resignation of Non-Executive Director

Changes in Chief Financial Officer and Supervisor

Appointment of Chairman

Appointment of the Chairman of the Supervisory Committee

Resignation of Non-Executive Director

Mr. Xiao Yi resigned as the Non-Executive Director and member of the Audit Committee of the Board of the Company due to change in his work position with effect from 19 December 2019.

Resignation of Chief Financial Officer

Mr. Li Tian resigned as the Chief Financial Officer of the Company due to change in his work positon with effect from 19 December 2019.

Appointment of Chief Financial Officer

Mr. Xiao Yi was appointed as the Chief Financial Officer of the Company for a term commencing from 19 December 2019 to the date when the term of the ninth session of the Board expires (expecting to be February 2021).

Resignation of Supervisor

Mr. Li Wei tendered his resignation to the Supervisory Committee of the Company on 19 December 2019 as an employee representative supervisor and the Chairman of the Supervisory Committee of the Company due to new working arrangement, with effect from on 19 December 2019.

Election of Employee Representative Supervisor and Appointment of Chairman of the Supervisory Committee

Mr. Ma Xiang was elected by the employee's representative meeting of the Company as the employee representative Supervisor of the ninth session of the supervisory committee of the Company on 19 December 2019, for a term commencing from 19 December 2019 to the date when the term of the ninth session of the Supervisory Committee expires. Mr. Ma Xiang was concurrently appointed as the Chairman of the ninth session of the Supervisory Committee of the Company, with a term expiring on the date when the term of the ninth session of the Supervisory Committee of the Company expires.

Appointment of Chairman

The 18th meeting of the ninth session of the Board was convened on 19 December 2019, at which Mr. Chen Xikun was elected as the Chairman of the ninth session of the Board of the Company, for a term commencing from 19 December 2019 to the date when the term of the ninth session of the Board expires (expecting to be February 2021).

Resignation of Non-Executive Director

Mr. Xiao Yi ("Mr. Xiao") tendered his resignation to the board of directors (the

"Board") of Sinopec Oilfield Service Corporation (the "Company") as a Non-

Executive Director and a member of the Audit Committee of the Board of the Company on 19 December 2019 due to new working arrangement, with effect from 19 December 2019.

Mr. Xiao has confirmed that he has no disagreement with the Board, and there are no other matters in relation to his resignation that need to be brought to the attention of the shareholders of the Company.

The Company would like to express its sincere gratitude to Mr. Xiao for his hard work and contributions to the Company during his tenure of services.

Resignation of Chief Financial Officer

Mr. Li Tian ("Mr. Li") tendered his resignation to the Board of the Company as the Chief Financial Officer of the Company on 19 December 2019 due to new working arrangement, with effect from 19 December 2019.

Mr. Li has confirmed that he has no disagreement with the Board, and there are no other matters in relation to his resignation that need to be brought to the attention of the shareholders of the Company.

The Company would like to express its sincere gratitude to Mr. Li for his hard work and contributions to the Company during his tenure of services.

Appointment of Chief Financial Officer

On 19 December 2019, the 18th meeting of the ninth session of the Board of the Company (the "Board Meeting") considered and approved the "Proposal in relation to Changes in Chief Financial Officer of the Company" and resolved to appoint Mr. Xiao as the Chief Financial Officer of the Company, for a term commencing from 19 December 2019 to the date when the term of the ninth session of the Board expires.

The biographical details of Mr. Xiao are as follows:

Mr. Xiao, aged 50, a senior accountant with a MBA degree. He has successively served as the deputy head and head of financial division under the Finance Department of China Petroleum & Chemical Corporation. In October 2006, he was appointed as Chief Financial Manager of SINOPEC Zhanjiang Dongxing Petroleum Enterprise Company Limited. In July 2009, he was appointed as Chief Financial Manager of SINOPEC Zhanjiang Dongxing Petrochemical Company Limited. Since December 2016, he has served as the deputy director of Finance Department of China Petrochemical Corporation. He served as the Non-Executive Director of the Company from June 2019 to December 2019. He has been serving as the Chief Financial Officer of the Company since December 2019.

Save as disclosed above, Mr. Xiao does not hold any position in the Company or its subsidiaries, nor does he hold any directorship of other listed companies in the past three years. Mr. Xiao does not have any relationship with any other directors, senior management, supervisors, substantial shareholders or controlling shareholder of the Company.

As at the date of this announcement, Mr. Xiao has no interest in the shares of the Company within the meaning of Part XV of the Securities and Futures Ordinance. Mr. Xiao has not received any regulatory sanction imposed by the China Securities Regulatory Commission (the "CSRC"), or any other government authorities or stock exchanges.

Mr. Xiao will enter into a service contract with the Company. The remuneration of Mr. Xiao will be determined in accordance with relevant state regulations and the Measures for Implementation of Remuneration Packages for Senior Management of the Company. Pursuant to such Measures for Implementation of Remuneration Packages for Senior Management of the Company, the specific amount of remuneration will consist of base salary, performance bonus and mid-term and long-term incentive, with specific reference to the functions, responsibilities of the respective employee and also the performance of the Company as a whole.

Save as disclosed above, there are no other matters in relation to Mr. Xiao's appointment as senior management of the Company that should be disclosed to the shareholders of the Company or matters which would require disclosure pursuant to Rule 13.51(2)(h) to Rule 13.51(2)(v) of the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited (the "Listing Rules").

Resignation of Supervisor

Mr. Li Wei tendered his resignation to the Supervisory Committee of the Company (the "Supervisory Committee") on 19 December 2019 due to change in his work position. Mr. Li Wei resigned as the employee representative supervisor and Chairman of the Supervisory Committee with effect from 19 December 2019.

Mr. Li Wei has confirmed that he has no disagreement with the Board and the Supervisory Committee, and there are no other matters in relation to his resignation that need to be brought to the attention of the shareholders of the Company.

The Company would like to express its sincere gratitude to Mr. Li Wei for his hard work and contributions to the Company during his tenure of services.

Election of Employee Representative Supervisor

To ensure normal operation of the Supervisory Committee, the Company convened employee's representative meeting on 19 December 2019 pursuant to the Company Law of the People's Republic of China and the Article of Association of the Company.

Resolution was passed by the employee's representative meeting that Mr. Ma Xiang

("Mr. Ma") was elected as the employee representative supervisor of the ninth session of the Supervisory Committee for a term commencing from 19 December 2019 to the date when the term of the ninth session of the Supervisory Committee expires.

The biographical details of Mr. Ma are as follows:

Mr. Ma, aged 58, is a senior political engineer with bachelor's degree. Since September 1999, he worked in Supervisory Bureau of China Petrochemical Corporation. Since December 2012, he served as Deputy Secretary of the Communist Party Committee, Secretary of the Commission for Discipline Inspection and Chairman of the Labour Union of China Petrochemical Corporation Wuhan Petrochemical Plant. Since December 2014, he was appointed as Chief of Beijing Group of Discipline Inspection Group of the Communist Party Committee of China Petrochemical Corporation and Director of the Beijing Branch of Supervisory Bureau of China Petrochemical Corporation. Since January 2018, he was appointed as Chief of China Petrochemical Corporation Party Committee Discipline Inspection Group of Sinopec International Petroleum Exploration and Production Corporation. Since October 2019, he has been working as Deputy Secretary of the Communist Party Committee, Secretary of the Commission for Discipline Inspection and Chairman of the Labour Union of Sinopec Oilfield Service Corporation.

Save as disclosed above, Mr. Ma does not hold any position in the Company or its subsidiaries, nor does he hold any directorship of other listed companies in the past three years. Mr. Ma does not have any relationship with any other directors, senior management, supervisors, substantial shareholders or controlling shareholder of the Company.

As at the date of this announcement, Mr. Ma has no interest in the shares of the Company within the meaning of Part XV of the Securities and Futures Ordinance. Mr. Ma has not received any regulatory sanction imposed by the CSRC, or any other government authorities or stock exchanges.

Mr. Ma will enter into a service contract with the Company. The remuneration of Mr. Ma will be determined in accordance with relevant state regulations and the Measures for Implementation of Remuneration Packages for Senior Management of the Company. Pursuant to such Measures for Implementation of Remuneration Packages for Senior Management of the Company, the specific amount of remuneration will consist of base salary, performance bonus and mid-term and long-term incentive, with specific reference to the functions, responsibilities of the respective employee and also the performance of the Company as a whole.

Save as disclosed above, there are no other matters in relation to Mr. Ma's appointment as the employee representative supervisor of the Company that should be disclosed to the shareholders of the Company or matters which would require disclosure pursuant to Rule 13.51(2)(h) to Rule 13.51(2)(v) of the Listing Rules.

Appointment of the Chairman of Supervisory Committee

The 12th meeting of the ninth session of the Supervisory Committee of the Company was convened on 19 December 2019 ("Supervisory Committee Meeting"). The attending Supervisors considered and approved the "Proposal in relation to the Election of the Chairman of the Ninth Session of the Supervisory Committee of the Company". Pursuant to the resolution passed at the Supervisory Committee Meeting, the Board is pleased to announce that Mr. Ma has been appointed as the Chairman of the ninth session of the Supervisory Committee, with a term expiring on the date when the term of the ninth session of the Supervisory Committee of the Company expires.

Appointment of Chairman of the Board and Changes of Members of Board Committees

Pursuant to the resolutions of the Board Meeting, the Board is pleased to announce that:

1. Mr. Chen Xikun was appointed as the Chairman of the Board. The term of Mr. Chen Xikun ("Mr. Chen") as Chairman of the Board shall start from 19 December 2019 to the date when the term of the ninth session of the Board expires (expecting to be February 2021).

The biographical details of Mr. Chen are as follows:

Mr. Chen, aged 55. Mr Chen is a professor-level senior accountant with a Master degree. In January 2003, he was appointed as the chief accountant of Sinopec Jiangsu Oilfield Branch Company; in April 2006, he was appointed as deputy manager and chief accountant of Sinopec Shengli Oilfield Branch Company; in December 2008, he was appointed as deputy general manager and chief accountant of Sinopec Shengli Oilfield Branch Company; in December 2011, he was appointed as chief accountant of Sinopec Exploration & Production Department; since March 2015, he acted as deputy general director of Sinopec Exploration & Production Department; from June 2015 to June 2018, he acted as director of Sinopec Oilfield Equipment Corporation; from June 2017 to February 2018, he was appointed as executive deputy general manager of the Company; in January 2018, he was appointed as the Secretary of CPC Committee of the Company. Since February 2018, he has been appointed as the Director of the Company. From February 2018 to May 2019, he has been appointed as Deputy General Manager of the Company. Since May 2019, he has been appointed as the Vice Chairman of the ninth session of the Board of the Company. Since December 2019, he has been appointed as the Chairman of the ninth session of the Board of the Company.

Other than disclosed above, Mr. Chen did not hold any positions in the Company or any of its subsidiaries, nor did he hold any other directorship of other listed companies in the past three years. He does not have any relationship with the Company, any other directors, senior management, supervisors, or substantial shareholders or controlling shareholder of the Company. As at the date of this announcement, Mr. Chen has no interest in the shares of the Company within the meaning of Part XV of the Securities and Futures Ordinance. Mr. Chen has not received any regulatory sanction imposed by the China Securities Regulatory Commission, or any other government authority or stock exchanges.

Mr. Chen has entered into relevant service contract with the Company as an Executive Director of the Company. The remuneration of Mr. Chen is determined in accordance with relevant laws and regulations and the Measures for Implementation of Remuneration Packages for Senior Management of the Company. Pursuant to such Measures for Implementation of Remuneration Packages for Senior Management of the Company, the specific amount of remuneration consists of a basic salary, performance bonus and mid- and long term incentives, with specific functions and responsibilities of the management members and performance of the Company as a whole being taken into account.

Other than disclosed above, there are no other matters in relation to Mr. Chen's election as the Chairman of the Board which should be disclosed to the shareholders of the Company or matters which would require disclosure under Rule 13.51(2) of The Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited.

2. The members of the Strategy Committee of the Board are as follows:

Strategy Committee:

Chief Officer: Mr. Chen Xikun

Members: Mr. Yuan Jianqiang, Mr. Lu Baoping and Ms. Jiang Bo

By Order of the Board

Mr. Li Honghai

Secretary to the Board

Beijing, PRC, 19 December 2019

As at the date of this announcement, the Board of Directors comprises Mr. Chen Xikun#, Mr. Yuan Jianqiang#, Mr. Lu Baoping+, Mr. Fan Zhonghai+, Mr. Wei Ran+, Ms. Jiang Bo*, Mr. Pan Ying*, Mr. Chen Weidong* and Mr. Dong Xiucheng*.

• Non-ExecutiveDirector
  # Executive Director
  * Independent Non-Executive Director