岩性差异及界面性质对裂缝起裂扩展的影响

doi:10.13722/j.cnki.jrme.2017.0960

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Abstract

When multi-laminated thin formation is fractured as a whole，it is hard to know fracture initiation and propagation morphology because of stress contrast，lithology difference，interfacial property and some other factors. In this paper，a model of three-layer hydraulic fracturing was designed and an improved large-scale tri-axial fracturing device was used to observe the fracture initiation and propagation. The effects of rock strength and interfacial property on the hydraulic fracture initiation and propagation were studied. It was observed from the experimental results that an unbonded and smooth interface inside rocks would induce a shear slippage at a low fracturing pressure under overburden pressure of 10 MPa. And the fracture would firstly be induced from a layer of low rock strength and then turned to propagate through the weak bonded interface when interlayer cement strength was small. However，large interlayer cement strength would cause sequential fracturing in all layers with low strength layer fractured first. In addition，asymmetric distribution of fracturing fluid in fracture was observed directly.

Key words： rock mechanics laminated formation hydraulic fracturing true tri-axial interfacial property lithology difference fracture initiation and propagation

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	Articles by authors
	GAO Jie
	HOU Bing
	CHEN Mian
	FU Weineng
	WU Yue
	ZHANG Ruxin

Cite this article:

GAO Jie,HOU Bing,CHEN Mian, et al. Effects of rock strength and interfacial property on fracture initiation and propagation[J]. , 2018, 37(S2): 4108-4114.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0960 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS2/4108

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