The Board of Directors of Sinopec Oilfield Service Corporation announced that, due to change of working arrangement, Mr. Liu Zhongyun has tendered his resignation to the Board as Chairman of the Board, the non- executive Director and Chairman of Strategy Committee of the Board (the "Resignation"), with effect from 9 December 2019. Mr. Chen Xikun, Vice Chairman of the Board, will perform the duties of Chairman of the Board with immediate effect until a new Chairman of the Board is elected.