1. College of Petroleum Engineering; Xi’an Shiyou University; Xi’an 710065 China
2. Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil and Gas Reservoirs; Xi’an Shiyou University; Xi’an 710065 China
3. CNOOC Research Institute; Beijing 100000 China
4. Department of Petroleum and Geosystems Engineering; The University of Texas at Austin; Austin Texas 78712 USA
5. School of Petroleum Engineering; China University of Petroleum (East China); Qingdao 266580 China