Sinopec Oilfield Equipment Corporation is a wholly owned subsidiary of Sinopec Oilfield Service Corporation, and the R&D, manufacturing and technical service center of oilfield equipment of Sinopec, as well as an important manufacturing base of oilfield equipment of China. The SJ Petroleum Machinery Corporation consists of Kingdream Public Limited Company, Shashi Steel Pipe Works, SJS Ltd., and Petroleum Machinery Research Institute.