The board of directors of Sinopec Oilfield Service Corporation announced that Mr. Li Honghai ("Mr. Li") ceased to be the company secretary (the "Company Secretary") and the authorized representative of the Company, with effect from 2 February 2021. Mr. Li confirmed that he has no disagreement with the Board and there are no other matters relating to his resignation that need to be brought to the attention of the shareholders of the Company. The Board announced the appointment of Mr. Shen Zehong ("Mr. Shen") as the Company Secretary, with effect from 2 February 2021. In the meantime, the Board is pleased to announced the appointment of Mr. Yuan Jianqiang ("Mr. Yuan") and Mr. Shen as the authorized representatives of the Company under Rule 3.05 of the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited (the "Listing Rules"), with effect from 2 February 2021. Mr. Shen, aged 42. Mr. Shen is a senior economist with a master degree. Mr. Shen joined Sinopec Yizheng Chemical Fibre Company Limited ("Yizheng Chemical Fibre") in 2003 and has continuously worked at the board secretary office in charge of information disclosure, shareholding management, investors relationship and etc.