Xizhao Jiang

Offshore Oil Engineering (Qingdao) Co., Ltd. provides oil-field services and is ultimately controlled by the Government of China. The company is based in Qingdao, China.

China Ocean Oilfields Services (Hong Kong) Ltd. supplies machinery for oil and gas exploration. The company is based in Hong Kong, Hong Kong. The Chinese company is ultimately controlled by the Government of China.

China National Offshore Oil Corp. explores oil and gas properties. The firm offers oil and gas exploitation, chemical and fertilizer production and refining, natural gas and power generation, new energies development, financial and logistic services. The company was founded on February 15, 1982 and is headquartered in Beijing, China.

CNOOC Shandong Chemical Engineering Co., Ltd. is based in Jinan, China. CNOOC Shandong Chemical Engineering Co., Ltd. provides engineering design and consulting services. The Chinese company is ultimately controlled by the Government of China. CNOOC Shandong Chemical Engineering Co. was acquired by CNOOC Refinery & Petrochemical Co. Ltd. from Offshore Oil Engineering Co., Ltd. on August 28, 2013 for $22.54 million.