热–流–固耦合作用下含水煤层渗透率模型建立及应用研究

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Abstract Understanding the behavior of gas flow within coal seams during CO2 injection for coalbed methane recovery is essential for the efficient recovery of coalbed methane and the mitigation of the greenhouse effect. Previous studies have often neglected the impacts of water and temperature in permeability modeling within coal seams. Consequently，a novel permeability model that integrates thermo-hydro-mechanical fields has been developed to investigate the gas flow in coal seams. This proposed model accommodates the gas-water two-element two-phase flow resulting from CO2 injection，incorporating the reduction in gas adsorption capacity due to the presence of water presence，non-equilibrium gas flow，and the influences of heat transfer and conduction. The established model was applied to a CO2-Enhanced Coalbed Methane(CO2-ECBM) project in the Qinshui Basin to conduct a numerical analysis of gas flow within coal seams. The results show that：(1) CH4 and water pressure experience three stages，whereas CO2 pressure consistently exhibits an increasing trend. (2) Temperatures near reservoir injection wells change at the same rate as near production wells after a certain time of recovery. (3) Permeability progresses through three stages，each governed by different controlling factors. (4) Both CH4 production and CO2 storage persist in increasing，although the rate of CH4 production declines following a peak，whereas the rate of CO2 storage continues to decline. The results have some theoretical significance for the understanding of gas flow laws within coal seams under the multi-physical fields.

Key words： mining engineering gas flow multi-field water adsorption swelling CO2-ECBM

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	Articles by authors
	XIAO Zhiyong1
	WANG Gang2
	LIU Jie1
	DENG Huafeng1
	JIANG Feng3
	ZHENG Chengcheng3

Cite this article:

XIAO Zhiyong1,WANG Gang2,LIU Jie1, et al. A permeability model of water-bearing coal seams under thermo-hydro-mechanical coupling effect and its application[J]. , 2024, 43(12): 3044-3057.

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https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I12/3044

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