基于钻孔局部壁面应力解除法的深部页岩三维地应力计算方法

doi:10.13722/j.cnki.jrme.2018.0104

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Abstract The in-situ stress condition of shale gas reservoir is a very important index to evaluate the gas extraction. A calculation model of 3D in-situ stress tensor of deep shale based on borehole wall stress relief method is presented considering the anisotropy，temperature changes and pressure at borehole wall. The distributions of stress around borehole wall are studied through numerical examples. The results show that the formulas between the borehole strains and far-field in-situ stress tensor are related to the mechanical and thermal parameters. At least 9 normal strains at different directions and combined laboratory test are needed to solve the 3D stress tensor around the measured area. The borehole pressure and temperature changes affect the distributions of stress within the range about twice of the borehole radii and the different degrees of mechanical and thermal anisotropy in deep rock also influence the results of stress measurements. When the 3D stress tensor of deep rock is calculated using the method of stress relief in borehole wall，the measurement environment and lithological conditions must be considered.

Key words： rock mechanics deep rock gas shale reservoir in-situ stress borehole wall stress relief method

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	Articles by authors
	QIN Yuqiao1
	2
	TANG Hua1
	WU Zhenjun1
	GE Xiurun1

Cite this article:

QIN Yuqiao1,2,TANG Hua1, et al. A calculation model for 3D in-situ stress tensor of deep shale based on borehole wall stress relief method[J]. , 2018, 37(6): 1468-1480.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0104 OR http://www.rockmech.org/EN/Y2018/V37/I6/1468

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