甲烷气通过页岩粗糙裂隙特性的试验研究

doi:10.13722/j.cnki.jrme.2015.1488

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Abstract Hydrofracturing method is the main technique of shale gas exploitation. Researching the methane through rough shale fractures is of great practical significance in this field. In this work，experiment of CH4 through rough shale fractures was investigated under different gas pressure gradients and confining pressures from 1 to 10 MPa. The main results are shown as follows. The fracture conductivity of shale is lower than that of other rocks. The values of flow rate do not strictly follow a linear trend with pressure changes，and the growth rate decreases with the increase of confining stress， indicating that gas through rough shale fractures is non-linear flow. The effective stress increases with the increase of confining stress. While the hydraulic aperture，flow rate and permeability follow the opposite trend. When the confining pressure exceeds 4.0 MPa，the fracture closure reaches the maximum，and the flow rate keeps stable. Forchheimer equation provides a good description for the non-linear fracture flow process. When confining pressure increases，the pore structure and fluid property changed，and the seepage prefers to the linear flow. According to the engineering practice，critical Reynolds number was determined when 10% of nonlinear effect was considered.

Key words： rock mechanics shale rough fracture non-linear flow Forchheimer equation

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	Articles by authors
	PENG Huihua1
	ZHOU Lei1
	2
	LU Yiyu1
	2

Cite this article:

PENG Huihua1,ZHOU Lei1,2, et al. Experimental study on conductivity of rough shale fractures using methane[J]. , 2016, 35(S2): 3644-3652.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.1488 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS2/3644

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