1. China Petroleum: China Petroleum is one of the largest oil and gas producers in China and one of the largest oil companies in the world. Responsible for oil exploration, development, production and sales in China and overseas. This company has a wide range of oil and natural gas resources in the world, and has strong strength in the fields of oil refining, chemical industry and sales.
2. China Petrochemical: China Petrochemical is the largest petrochemical complex in China and one of the largest petrochemical companies in the world. Mainly engaged in oil and gas exploration, mining, refining, chemical industry and sales. China Petrochemical is widely distributed in the petrochemical industry at home and abroad, with a huge network of refining, chemical industry and sales.
3. China Offshore Oil: China Offshore Oil is a state-owned oil company in China, which is responsible for the exploration, development and production of offshore oil and natural gas resources in China. The company has rich experience and technology in offshore oil fields, devoted itself to the development of offshore oil and gas fields, and made important contributions to China's energy supply.
4. Yanchang Oilfield: China Yanchang Petroleum is a state-owned oil company in China, mainly engaged in oil and gas exploration, development, production and sales. China Yanchang Oilfield is rich in oil resources and is one of the important oilfields in China.
5. CNOOC: CNOOC is a state-owned oil company in China, mainly engaged in the exploration, development and production of offshore oil and natural gas resources. There are many offshore oil and gas projects at home and abroad, and they have rich technology and experience in the field of offshore oil.