Sinopec Siji Petroleum Machinery Co., Ltd. (Siji Company) is located in Jingzhou, Hubei Province, covering an area of ​​663,000 square meters, of which the industrial construction and production site area is 296,000 square meters, and currently employs 2,100 people. It is a professional oil drilling and production equipment development enterprise.The company was founded in Lanzhou in 1941. At the end of 1969, it participated in the Jianghan Oilfield Battle and went south to Jingzhou, Hubei, and was renamed the Fourth Machinery Factory.