页岩水力压裂微裂纹扩展演化试验研究及力学机制分析

doi:10.13722/j.cnki.jrme.2021.1210

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Abstract Hydraulic fracturing is commonly applied into shale gas exploitation industry. However mechanical mechanism of permeability under the fracturing has been unclear so far. In view of this，a statistical analysis and discussion of the mechanical mechanism by the laboratory experiments on the hydraulic fracturing cracks propagation，and the activation of bedding plane of shale specimen are presented in the study. It is demonstrated that the microscopic observed micro-cracks could not be produced by fluid pressure as the latter generated compressive stresses on the places of micro-cracks. On the contrary，the micro-cracks are produced by tensile stress concentration in front of the propagating fracture. This implies that the bedding plane reactivation is caused by fracture propagation along the plane. An analysis of micro-crack lengths shows that shale exhibits anisotropy in fracture toughness with the resistance to fracture propagation parallel to bedding planes being as twice a small as compared with the resistance to fracture propagation in the directions normal to bedding planes.

Key words： rock mechanics shale hydraulic fracturing micro-crack propagation stress singularity micro-crack statistics

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	Articles by authors
	QU Xiaolei1
	HE Jianming2
	3
	CHEN Jie4
	TANG Hao4
	DONG Ruyi4
	QI Chengzhi1

Cite this article:

QU Xiaolei1,HE Jianming2,3, et al. Experimental study on micro-crack propagation and mechanical mechanism analysis of hydraulic fracturing in shale[J]. , 2023, 42(S1): 3151-3159.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.1210 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS1/3151

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