The board of directors of Sinopec Oilfield Service Corporation announced that the Board has received the written resignations from Mr. Yuan Jianqiang and Mr. Zhang Yongjie. Due to reached the statutory retirement age, Mr. Yuan Jianqiang resigned from the positions of executive director, authorised representative of the Company and member of the strategy committee of the Board; Mr. Zhang Yongjie resigned from the position of deputy general manager of the Company (collectively, the Resignations). The Resignations will take effect from 8 December 2023. Upon the Resignations, Mr. Yuan Jianqiang and Mr. Zhang Yongjie would no longer hold any position in the Company or its subsidiaries. Mr. Yuan Jianqiang and Mr. Zhang Yongjie have 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 Congbang as the deputy 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 Congbang, aged 53, is a professor-level Senior Engineer with a bachelor's degree. In May 2006, he served as the deputy general manager of the Saudi Arabia branch of Sinopec International Petroleum Service Corporation; in May 2008, he served as the general manager of the Kuwait branch of Sinopec International Petroleum Service Corporation; in March 2011, he served as the deputy chief engineer of Sinopec International Petroleum Service Corporation and the general manager of the Kuwait branch; in March 2012, he served as the deputy chief engineer of Sinopec International Petroleum Service Corporation and the general manager of the Kuwait
branch, UAE Subsidiary branch and Abu Dhabi branch; in July 2019, he served as the deputy general manager of Sinopec International Petroleum Service Corporation; in December 2020,
he served as the general manager and deputy secretary of the Communist Party Committee of Sinopec International Petroleum Service Corporation; in December 2023, he served as the executive director and secretary of the party committee of Sinopec International Petroleum Service Corporation. Since December 2023, he has been appointed as the deputy general manager of the Company.