 HONG KONG, Aug. 2, 2021 PRNewswire -- CNOOC Limited the Company, SEHK: 00883, NYSE: CEO, TSX: CNU today announced that Liuhua 21-2 oilfield has commenced production ahead of schedule. Liuhua 21-2 oilfield is located in the eastern South China Sea, with water depth of about 437 meters. 