The board of directors (the "Board") of Sinopec Oilfield Service Corporation (the "Company") announces that Mr. Zuo Yaojiu ("Mr. Zuo") has tendered his resignation as the Deputy Manager of the Company on 21 December 2022 to the Board since Mr. Zuo has reached the statutory retirement age. The Board has accepted his resignation with effect from 21 December 2022. After Mr. Zuo's resignation, he will not serve any position in the Company.