PROPAGATION OF HYDRAULIC FISSURES AND BEDDING PLANES IN HYDRAULIC FRACTURING OF SHALE
LI Zhi1，JIA Changgui2，YANG Chunhe1，3，ZENG Yijin2，GUO Yintong1，HENG Shuai1，
WANG Lei1，HOU Zhenkun3
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. Sinopec Research Institute of Petroleum Engineering，Beijing 100101，China；
3. State Key Laboratory for Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400044，China)
Abstract：In order to investigate the interaction of the hydraulic fractures and the bedding planes of shale in hydraulic fracturing，the hydraulic fracturing experiments under triaxial conditions were carried out with the acoustic emission system monitoring the process of hydraulic fracturing and the CT scanning system scanning the sections of rock samples before and after hydraulic fracturing for capturing the distribution of fractures. The initiation and propagation of the hydraulic fracture was captured experimentally. At the situation of small difference of stresses，the critical pressure for initiation was found to be differed little in different angels，the fracture grew along the direction of after initiation. The critical pressure for the propagation of major hydraulic fractures was related to the length of fracture and . The small sections of the bedding planes in shale were opened up when the major hydraulic fracture approached. The passage was created at the intersection of the hydraulic fracture and the bedding plane due to shearing tension. The shear zone was larger than opened one，with a ratio of 13 at maximum，functioning as the major passage for fluid flow. The length of the shear zone is sensitive to the cohesion of bedding planes, and the angle of intersection of hydraulic fracture and bedding plane.
陈 勉，庞 飞，金 衍. 大尺寸真三轴水力压裂模拟分析[J]. 岩石力学与工程学报，2000，19(增)：868-872.(CHEN Mian，PANG Fei，JIN Yan. Simulation and analysis of real triaxial hydraulic fracturing[J]. Chinese Journal of Rock Mechanics and Engineering，2000，19(Supp.)：868-872.(in Chinese))
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2015, Vol. 34 
