Mr. Xiao Yi resigned as the Non-Executive Director and member of the Audit Committee of the Board Sinopec Oilfield Service Corporation due to change in his work position with effect from 19 December 2019. Mr. Li Tian resigned as the Chief Financial Officer of the Company due to change in his work position with effect from 19 December 2019. 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).

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. 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.

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). Mr. Xiao, has successively served as the deputy head and head of financial division under the Finance Department of China Petroleum & Chemical Corporation. He has been serving as the Chief Financial Officer of the Company since December 2019.