1. College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao, China
2. College of Science, China University of Petroleum (East China), Qingdao, China
3. Xianhe Oil Production Plant, Shengli Oilfield Branch, SINOPEC, Dongying, China
4. The fourth Production plant, Changqing Oilfield, Xian, China