须家河组致密砂岩水力压裂裂缝形态的试验研究

doi:10.13722/j.cnki.jrme.2015.0114

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Abstract To investigate the propagation characteristics and spatial distributions of hydraulic fractures of tight sandstone，the large real traixial physical model experiment system has been selected to conduct hydraulic fracture tests on the outcrop tight sandstone samples drilled from Xujiahe Group，Jiannan Area. Based on the tests results，the mechanism of crack extension and initiation is exposed and bedding plane with the fracture morphologies has been analyzed. Also，the effects of types and delivery capacity of fracture fluid and differential parameters of in-situ stress on the fracture morphology have been discussed. The results indicate that hydraulic fractures of tight sandstone are easy to extend along one direction and present single-wing style，so they are less likely to form crossover crack network. As to tight sandstone，the rock properties play important roles in controlling initiation and extension mode of fractures. In summary，there are four kinds of hydraulic fracture initiation modes and six kinds of extension mode. And，pumping pressure-time curves can be divided into four types：the 1th curve type is correspinding to single-wing，planar crack；the others are belonged to network crack. The fracture pressure has a linear relation with delivery capacity，and it is irrelevant to differential parameters of in-situ stress. Its worth mentioning that leak-off effect should not be considered unless distilled water is employed as fracture fluid.

Key words： rock mechanics Xujiahe Group tight sandstone hydraulic fracture fracture geometry triaxial physical simulation Pumping pressure curve

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	Articles by authors
	WEI Yuanlong1
	YANG Chunhe1
	2
	GUO Yintong2
	LIU Wei1
	WANG Lei2
	HOU Zhenkun1
	XU Feng2

Cite this article:

WEI Yuanlong1,YANG Chunhe1,2, et al. Experimental study on hydraulic fracture geometry of tight sandstone from Xujiahe group[J]. , 2016, 35(S1): 2720-2731.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.0114 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS1/2720

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