摘要
Shaanxi Yanchang Petroleum （Group） Co.,Ltd,（＂Yanchang Petroleum＂ lbr short）, directly under the People＇s Government of Shaanxi Province, is now one of China＇s big-four oil corporations with legal exploration and production certificates. It was established in 1905 and in 1907 completed the first onshore well in China. In 1944, Chairman Mao inscribed ＂Working hard＂ to encourage it. Now it has four subordinate oil companies, such as Yanchang Oilfield Joint-stock Company, the Refining Company, the Pipeline Transportation Company and the Sales Company,
