supported by the National Major Research Program for Science and Technology of China(2011ZX05034-001);National Natural Science Foundation of China(40972107);Program for Excellent Doctoral Dissertation Supervisor of Beijing(YB20101141501);Program for New Century Excellent Talents in University(NCET-11-0721);PetroChina Innovation Foundation(2010D-5006-0101);A Foundation for the Author of National Excellent Doctoral Dissertation of PR China
1 Introduction Mechanical properties of coal are most important parameters in controlling fluid storage and flow before and after coal extraction [1-2].Reservoir simulation design and wellbore stability analysis are i...