摘要
在CO_(2)驱替增强开采过程中,煤层裂隙行为对封存/采收有显著影响。为了解决多物理场耦合效应下裂隙粗糙度演化对工程效率影响尚不明确的难题,建立了一种创新的跨学科数学模型,提出定量描述煤层裂隙粗糙度的参数,并将其与煤层多场效应下的气体流动控制方程耦合,研究了煤层瓦斯开采过程中的热-流-固耦合效应及裂隙网络特性。结果表明:数学模型与实地数据吻合良好,能够表征煤层裂隙粗糙度;裂隙粗糙度对煤层瓦斯剩余压力及注入CO_(2)气压有显著影响;当粗糙度参数由0.24降至0.18时,煤层瓦斯含量最大降低32.5%,CO_(2)压力最大增加26.7%,煤层瓦斯吸附量最大降低31.7%,CO_(2)吸附量最大升高12.1%。
In the process of CO_(2)-enhanced coalbed methane recovery,the behaviours of coal seam fractures significantly affect sequestration and extraction.To address the unclear impact of fracture roughness evolution on engineering efficiency under multi-physical field coupling effects,we developed an innovative interdisciplinary mathematical model.This model introduces a parameter to quantitatively describe coal seam fracture roughness and couples it with the gas flow control equations under multi-field effects in the coal seam.We investigated the thermo-hydro-mechanical(THM)coupling effects and fracture network characteristics in the coal seam gas extraction process.Results show that the mathematical model aligns well with field data and effectively characterizes coal seam fracture roughness.Fracture roughness significantly influences the residual gas pressure in the coal seam and the injection pressure of CO_(2).When the roughness parameter decreases from 0.24 to 0.18,the maximum methane content decreases by 32.5%and the maximum CO_(2)pressure increases by 26.7%,the maximum gas adsorption capacity of coal seam decreased by 31.7%,and the maximum CO_(2)adsorption capacity increased by 12.1%.
作者
韩文彬
张迪
郑义
刘东洋
HAN Wenbin;ZHANG Di;ZHENG Yi;LIU Dongyang(Baode Coal Mine,CHN Energy Shendong Coal Group Co.,Ltd.,Baode 036600,China;China Coal Research Institute,Beijing 100013,China;CCRI Tongan(Beijing)Intelligent Control Technology Company Limited,Beijing 100013,China;Beijing Engineering and Research Center of Mine Safe,Beijing 100013,China;National Key Laboratory of Intelligent Mining and Rock Strata Control,Beijing 100013,China)
出处
《煤矿安全》
CAS
北大核心
2024年第8期51-61,共11页
Safety in Coal Mines
基金
煤炭科学技术研究院有限公司科技发展基金资助项目(2023CX-Ⅱ-15)。
关键词
瓦斯开采
非线性渗流
粗糙裂隙
CO_(2)封存
多场耦合
数值仿真
gas extraction
nonlinear seepage
rough fractures
CO_(2)sequestration
multi-field coupling
numerical simulation
作者简介
韩文彬(1987—),男,山西太原人,工程师,硕士,从事“一通三防”和监测监控管理工作。E-mail:695270271@qq.com;通讯作者:刘东洋(1991—),男,河北承德人,研究实习员,硕士,主要从事煤矿“一通三防”理论、技术及装备研发工作。E-mail:731005784@qq.com。
