1. Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, P. R. China
2. School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China
3. Research Institute of Petroleum Engineering, SINOPEC Henan Oilfield Company, Nanyang 473132, P. R. China
4. Kazakh-British Technical University, Almaty 050000, Kazakhstan