1. School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China
2. Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, P. R. China
3. Oilfield Production Engineering Research Institute, Optimization Production Division, China Oilfield Services Limited, Tianjin 300459, P. R. China
4. Zhundong Oil Production Plant of PetroChina Xinjiang Oilfield Company, Xinjiang 831511, China