深层页岩在高水平应力差作用下压裂裂缝形态实验研究

doi:10.13722/j.cnki.jrme.2018.0030

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Abstract A series of hydraulic experiments are conducted to investigate the morphology of fractures in deep shale under high difference of horizontal in-situ stresses using a triaxial fracturing system. The results indicate that the hydraulic fractures always crack in the direction perpendicular to the minor principal stress，and extend，penetrate，connect or deflect when encounter the bedding planes and natural fractures. The fracture morphology have four categories：simple fracture，fractures with bedding planes opening，fractures with deflection and complex fractures affected by natural fractures. The increasing of horizontal stress difference leads to a higher penetrating ability of fractures. The higher the initial pressure，the more complex the fracture morphology. Stimulated reservoir volume can be improved by injecting the high viscosity fracturing fluid to generate the main fractures and by injecting the low viscosity fluid to open the branching fractures.

Key words： rock mechanics deep shale high in-situ horizontal stress deviation true triaxial conditions hydraulic fracturing fracturing extension injection

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	Articles by authors
	KAO Jiawei1
	JIN Yan1
	FU Weineng1
	SANG Yu2
	ZENG Bo2
	XIANG Jianhua2
	HUANG Haoyong2

Cite this article:

KAO Jiawei1,JIN Yan1,FU Weineng1, et al. Experimental research on the morphology of hydraulic fractures in deep shale under high difference of in-situ horizontal stresses[J]. , 2018, 37(6): 1332-1339.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0030 OR http://www.rockmech.org/EN/Y2018/V37/I6/1332

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