Rock failure mechanisms in the surrounding rock masses with deep level tunnels and in the source areas of disastrous events
HOU BING, CHEN MIAN, TAN PENG, TAN PENG
HOU BING, PhD, Associate professor, State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China.Email: houbing9802@163.com
CHEN MIAN, Professor, Dean, State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China. Key Laboratory of Reservoir Stimulation, CNPC, Langfang, China. Email: chenmian@vip.sina.com
TAN PENG, Master Candidate, State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China. Email: tanpeng09jy@163.com
CHENG WAN, PhD candidate, State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China. E-mail: chengwancup@163.com
Experimental investigation on the non-planar propagation of hydraulic fracture in Fractured Shale Reservoir
Experimental results indicated that hydraulic fracture will form a non-planar fracture network in space when it the natural fractures (crossing or deflecting along the natural fractures). Natural fractures with big or low bonding strength often cause a deflection of hydraulic fracture so that it is difficult to form a new principal hydraulic fracture. Fracture fluid flowing into the lamination distributed elliptically when hydraulic fracture penetrates the bedding plane. AE concentrates on the direction of crack initiation along the rock mass, while it is weaker as hydraulic fracture along natural fracture. Therefore, whether hydraulic fracture could penetrate natural fracture is predominated by the fracture aperture and bonding strength of natural fracture. It is easy to form a spatial non-planar fracture network when hydraulic fracturing is conducted in fractured shale reservoirs. The volume of fracturing fluid penetrating into the lamination is less than that in principal hydraulic fracture. It is believed that the investigation on the interactions between hydraulic and natural fracture would be useful for prediction of the hydraulic fracture propagation and network hydraulic fracturing.
Key words: shale gas reservoir, hydraulic fracturing, non-planar propagation fracture network, volume fracturing.
