Gucheng oil field in Henan
Xiaermen oil field in Henan
Ansai oil field in Changqing
Baibao oil field in Changqing
Chaoyanggou oil field in Daqing
Dongxi oil field in shengli
Dongxin oil field in Shengli
Guangli oil field in Shengli
Gudao oil field in Shengli
Gudong oil field in Shengli
Heidimiao oil field in Daqing
High mineralized waste water in oil field
Huatugou oil field in Qinghai
Huqing oil field in Zhongyuan
Huzhuang oil field in Zhongyuan
information application in oil field