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. The company operates through Exploration, Exploitation and Operation Business; and Supply and Procurement Business segments. It engages in the wholesale, retail, storage, and transportation of refined oil. The company also acquires, explores for, exploits, develops, and produces crude oil and natural gas; and trades in and distributes oil related products. It owns interests in oilfield blocks located in Saskatchewan and Alberta, 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 operates as a subsidiary of Yanchang Petroleum Group (Hong Kong) Co., Limited.