1. The secondary unit of CNOOC is CNOOC North China Oilfield Company, which is mainly responsible for oil exploration, development, production and sales in North China. Headquartered in Renqiu City, Hebei Province, the company is located in Shicang and the hinterland of Beijing and Tianjin.
2. CNOOC East China Oilfield Company is responsible for oil exploration, development, production and sales in East China. The company has a complete business system of offshore oil exploration, development, production, sales and management, and is committed to creating value for shareholders and society.