Yanchang Petroleum International Limited, an investment holding company, engages in the supply and procurement operation of oil related products in the People's Republic of China, Canada, Hong Kong, and internationally. The company operates through Exploration, Exploitation and Operation Business; and Supply and Procurement Business segments. It engages in the wholesale, retail, storage, and distribution of refined oil. The company also acquires, explores for, exploits, develops, and produces crude oil and natural gas, as well as engages in the fuel oil and oil related product trading business. It owns interests in oilfield blocks located in Canada. The company was formerly known as Sino Union Energy Investment Group Limited and changed its name to Yanchang Petroleum International Limited in May 2012. The company was incorporated in 2001 and is headquartered in Causeway Bay, Hong Kong. Yanchang Petroleum International Limited is a subsidiary of Yanchang Petroleum Group (Hong Kong) Co., Limited.