1. Chongqing Institute of Unconventional Oil and Gas Development, Chongqing University of Science and Technology, Chongqing 401331, P. R. China
2. School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, P. R. China
3. School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, P. R. China