摘要
气体吸附/解吸所释放/吸收热量对煤层渗透率回弹和恢复特性演化存在显著影响,基于热-流-固(THM)多物耦合理论探究了单/多重瓦斯吸附热因素耦合作用下渗透率回弹和恢复现象在时间尺度上的演化特征,并进一步获取吸附热效应对煤层气开采特性的影响.结果表明:单一因素作用下,渗透率回弹和恢复时间与吸附热强度呈正相关趋势,同样其对Langmuir常数的响应特征与前者类似,且当吸附性能参数超过临界值后趋于稳定;多因素耦合作用下,瓦斯吸附热强度对渗透率回弹和恢复现象时间尺度的控制作用表现为促进,而空间尺度上则不易受吸附热影响.此外,若未考虑瓦斯吸附热效应将会高估回弹和恢复带来的瓦斯流量增量.
The thermal quantity released/absorbed during gas adsorption/desorption significantly influences the evolution of permeability rebound and recovery in coal seams.Based on the thermo-hydro-mechanical(THM)coupling theory,this study investigates the temporal evolution of permeability rebound and recovery under single/multiple gas adsorption thermal effects and further assesses their impact on coalbed methane(CBM)extraction.Results indicate that under a single-factor influence,permeability rebound and recovery time exhibit a positive correlation with adsorption heat intensity,and its response to Langmuir’s constant is characterized similarly to the former and tends to stabilize when the adsorption performance parameter exceeds the critical value.Under multi-factor coupling,adsorption heat enhances permeability rebound and recovery on the temporal scale while the spatial scale is less susceptible to adsorption heat.Furthermore,neglecting adsorption thermal effects may lead to an over-estimation of the gas production increase induced by permeability rebound and recovery.
作者
刘正东
林晓松
白刚
孙晨
LIU Zheng-dong;LIN Xiao-song;BAI Gang;SUN Chen(School of Resources&Civil Engineering,Northeastern University,Shenyang 110819,China;School of Safety Science and Engineering,Liaoning Technical University,Fuxin 123000,China)
出处
《东北大学学报(自然科学版)》
北大核心
2025年第5期103-112,共10页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金资助项目(52104188,52374189)
中国博士后科学基金资助项目(2022MD713769)
河南省瓦斯地质与瓦斯治理重点实验室开放课题资助项目(WS2023A02)。
关键词
煤层气
渗透率回弹
渗透率恢复
瓦斯吸附热效应
抽采量
coalbed methane
permeability rebound
permeability recovery
gas adsorption thermal effects
extraction capacity
