The board of directors of Sinopec Oilfield Service Corporation announced that the Board has received the written resignations from Mr. Yuan Jianqiang. Due to reached the statutory retirement age, Mr. Yuan Jianqiang resigned from the positions of general manager, authorised representative of the Company. The Resignations will take effect from 8 December 2023.

Upon the Resignations, Mr. Yuan Jianqiang would no longer hold any position in the Company or its subsidiaries. Mr. Yuan Jianqiang has confirmed that they have no disagreement with the Board and there are no other matters relating to the Resignations that need to be brought to the attention of shareholders of the Company. On 8 December 2023, the Board has approved to appoint Mr. Zhang Jiankuo as the general manager of the Company.

The Appointment will take effect from 8 December 2023 to the date when the term of the tenth session of the Board expires (expecting to be February 2024). Mr. Zhang Jiankuo, aged 49, is a professor-level Senior Engineer with a master's degree. In November 2015, he served as the manager and deputy secretary of the Communist Party Committee of Sinopec Shengli Petroleum Engineering Co.

Ltd. Yellow River Drilling Corporation; in December 2018, he served as the deputy general manager of Sinopec Shengli Petroleum Engineering Co. Ltd. In October 2020, he served as the deputy general manager of the Company. In June 2022, he served as the deputy general manager of Petroleum Exploration & Development Research Department of China Petroleum & Chemical Corporation.

Since December 2023, he has been appointed as the general manager of the Company.