循环渐进升压对页岩压裂效果的影响

doi:10.13722/j.cnki.jrme.2017.1559

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Abstract In order to reveal the influence of cyclic progressive pressure on the fracturing effect of shale，the true triaxial hydraulic fracturing test of shale samples was carried out，and the rupture effects of one-time fracturing and progressive pressure fracturing were compared and analyzed. The experimental results show that：(1) Based on the comparison of fracturing pressure curve，and AE energy curve，one-time fracturing method is prone to produce a single main fracture and generate relative sample hydraulic fracture networks. Progressive fracturing method tends to create multiple fractures and complex networks. (2) Based on the analysis of the AE positioning，the one-time fracturing AE location shows a liner distribution with respect to a single fracture，and cyclic fracturing AE location presents a dense distribution which filled a larger volume of test samples. (3) Based on the comparative analysis of the morphological，quantitative and fractal dimensions of macroscopic cracks，the cyclic progressive method can significantly improve the seam network density and the permeability of test samples，hence optimizes field hydraulic fracturing methods. (4) Based on the extended finite element numerical simulation，the cyclic progressive fracturing method can produce long and devious main fractures and tend to generate more secondary fractures along the main fracture，which can increase the density of fractured seams networks and enhance the effect of volumetric fracturing.

Key words： rock mechanics true triaxial hydraulic fracturing cyclic progressive fracturing acoustic emission crack propagation fractal dimension comparative test

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	Articles by authors
	ZHAO Zijiang1
	2
	LIU Daan1
	2
	CUI Zhendong1
	2
	TANG Tiewu1
	2
	HAN Weige1
	2

Cite this article:

ZHAO Zijiang1,2,LIU Daan1, et al. Cyclic progressive pressure on the fracturing effect of shale[J]. , 2019, 38(S1): 2779-2789.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1559 OR http://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS1/2779

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