1. Xi’an Shiyou University, Xi’an 710065, China
2. Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs, Xi’an 710065, China
3. Engineering Research Center of Development and Management for Low to Ultra-low Permeability Oil & Gas Reservoirs in West China (Ministry of Education), Xi’an 710065, China
4. PetroChina Coalbed Methane Company Limited, Beijing 100028, China
5. China University of Petroleum-Beijing, Beijing 102249, China