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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摘要了解注CO2开采煤层气过程煤层内的气体流动规律对煤层气的高效开采和缓解温室效应具有重要意义。现有研究在建立煤层内渗透率模型时往往忽略了水和温度的影响，为此，建立一个新的耦合温度场–渗流场–固体力学场的模型对煤层中的气体流动规律进行研究。该模型考虑注CO2引起的气–水两元两相流、水对气体吸附性能的衰减、气体非平衡流动以及热传递和热传导作用。将建立的模型应用于沁水盆地的注CO2增采煤层气项目，数值分析煤层中气体的流动情况。研究结果表明：(1) CH4压力和水压经历三个阶段的变化，CO2压力呈现一直增加的趋势；(2) 储层注入井附近温度在开采达到一定时间后变化速率与生产井附近相同；(3) 渗透率经历3个阶段的变化，且每个阶段的控制因素不同；(4) CH4产量和CO2储量持续增加，CH4产率在出现峰值后下降，而CO2储率则一直下降。研究结果对于多物理场耦合作用下煤层内的气体流动规律认识具有一定的理论价值。

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	肖智勇1
	王刚2
	刘杰1
	邓华锋1
	姜枫3
	郑程程3

关键词 ：采矿工程, 气体流动, 多物理场, 水, 吸附膨胀, CO2-ECBM

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

引用本文:

肖智勇1，王刚2，刘杰1，邓华锋1，姜枫3，郑程程3. 热–流–固耦合作用下含水煤层渗透率模型建立及应用研究[J]. 岩石力学与工程学报, 2024, 43(12): 3044-3057.
XIAO Zhiyong1，WANG Gang2，LIU Jie1，DENG Huafeng1，JIANG Feng3，ZHENG Chengcheng3. A permeability model of water-bearing coal seams under thermo-hydro-mechanical coupling effect and its application. , 2024, 43(12): 3044-3057.

链接本文:

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

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