含水煤岩渗透率演化规律及动态滑脱效应的作用机制

doi:10.13722/j.cnki.jrme.2021.0531

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Abstract In order to explore the evolution of permeability of coal with different water contents under the combined effect of effective stress and dynamic slippage，a gas-containing coal thermal-fluid-solid triaxial servo seepage device was used to measure the permeability of coal in the effective stress rise process under different water contents. A coal permeability model was established considering the effective stress，the water content and the dynamic slippage effect. The seepage characteristics and dynamic slippage effects of coal were further analyzed under different effective stresses and water contents. The research results show that，when the water content is a constant，the coal permeability decreases exponentially with increasing the effective stress，and that，when the effective stress is a constant，the greater the water content，the lower the coal permeability. A dynamic slippage factor model considering the changes of the effective stress and the water content is established. Under the conditions of various water contents，the coal fissure channels are gradually closed with increasing the effective stress and, at the same time，the slippage factor shows an increasing trend. In addition，under the same effective stress，the slippage factor increases with the water content，specifically，a slow increase while the water content less than 1.80% and then a sharp rise. A permeability model of water-bearing coal was constructed and its reliability was verified. The contribution of the slippage effect to the permeability was further quantified. A permeability model of coal considering the difference of fracture shapes in actual reservoirs was proposed. The permeability characteristics of coal under dry conditions were studied. The permeability of coal with circular fractures is the smallest，followed by square fractures and equilateral triangle fractures. The research on the migration law of coalbed methane in reservoir under the comprehensive action of multiple factors is helpful for improving the recovery of coalbed methane.

Key words： rock mechanics coal water content slippage effect permeability model effective stress

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	Articles by authors
	DUAN Shulei1
	LI Bobo1
	2
	3
	LI Jianhua1
	GAO Zheng1
	CHENG Qiaoyun1
	XU Jiang4

Cite this article:

DUAN Shulei1,LI Bobo1,2, et al. Permeability evolution of water-bearing coal considering dynamic slippage effect[J]. , 2022, 41(4): 798-808.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0531 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I4/798

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