煤体水力压裂过程中孔壁应变及电阻率响应特征试验研究

doi:10.13722/j.cnki.jrme.2015.0157

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Abstract In order to analyze damage evolution state of coal sample in hydraulic fracture process，a joint test method combining borehole strain and electrical resistivity has been proposed. The borehole strain and electrical resistivity response characteristic of coal samples in hydraulic fracture process have been studied with self-developed hydraulic fracture experimental system. The curves of borehole strain，electrical resistivity and water pressure have been obtained while the response mechanism is analyzed. The results show that there is strong regularity in borehole strain and electrical resistivity curves. The borehole strain curves show “V” shape while the electrical resistivity curves show “” shape. When water takes up the space of borehole，the electrical resistivity of coal samples reaches the minimum value. When the borehole fractured，borehole strain and electrical resistivity increase to the maximum value gradually. Borehole strain reflects the deformation characteristic of borehole during hydraulic fracture process while the electrical resistivity reflects the initiation and development of fissure inner coal samples. Volume fracturing of coal samples causes the dilatation of fissure，resulting in sudden change of electrical resistivity. The curves of borehole strain，electrical resistivity and water pressure have rich information for fracturing of coal sample in hydraulic fracture process. And it provides a new method to analyze initiation behavior of coal sample in hydraulic fracture process.

Key words： rock mechanics hydraulic fracturing borehole strain electrical resistivity volume fracturing dilatation

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	Articles by authors
	MA Yankun
	LIU Zegong
	CHENG Yunhai
	ZHOU Jian
	WU Hao
	SUN Jian

Cite this article:

MA Yankun,LIU Zegong,CHENG Yunhai, et al. Laboratory test research on borehole strain and electrical resistivity response characteristic of coal samples in hydraulic fracture process[J]. , 2016, 35(S1): 2862-2868.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.0157 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS1/2862

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