煤矿安全2025，Vol.56Issue(4)：26-36,11.DOI:10.13347/j.cnki.mkaq.20240099
深部煤层封存CO2过程热-流-固-化相互作用机制数值模拟研究
Numerical simulation study on thermo-hydro-mechanical-chemical interaction mechanism during CO2 storage in deep coal seams
摘要
Abstract
In order to study the effects of physical and chemical interactions between multiple gases,water and coal rock after CO2 injecting in coal seams on the CO2-injected enhanced coalbed methane recovery(CO2-ECBM)project,based on the dynamic charac-teristics of binary gas competitive adsorption,seepage diffusion,gas dissolution and mineral dissolution and precipitation,a thermo-hydro-mechanical-chemical coupling model of CO2-ECBM was established.CMG-GEM was used for numerical simulation study to analyze the effects of injection strategies and groundwater environment on gas adsorption capacity,permeability and dissolution and precipitation of inorganic mineral components under different coupling methods.The results show that the coupled thermo-hydro-mechanical-chemical model can describe the gas migration behavior in deep coal seams more accurately.After CO2 injection,com-petitive adsorption occurs,and the permeability around the injection well decreases rapidly,while the unaffected area increases slightly.Under the action of pressure,CO2 dissolves in water,increasing the acidity of groundwater.The dissolution and precipita-tion behavior of inorganic minerals in different groundwater environments is different,especially for carbonate minerals such as dolomite.Due to the inhibition of dissolution by Mg2+,pore blockage may be caused and displacement efficiency may be reduced.关键词
CO2-ECBM/热-流-固-化耦合模型/渗透率/矿物溶解沉淀/CO2封存Key words
CO2-ECBM/thermo-hydro-mechanical-chemical coupling model/permeability/mineral dissolution and precipitation/CO2 sequestration分类
矿业与冶金引用本文复制引用
张瑞荣,李宏,戴靠山,周辉,赵瑜..深部煤层封存CO2过程热-流-固-化相互作用机制数值模拟研究[J].煤矿安全,2025,56(4):26-36,11.基金项目
深地科学与工程教育部重点实验室(四川大学)开放基金资助项目(DESEYU202303) （四川大学）
岩土力学与工程国家重点实验室(武汉岩土所)开放基金资助项目(SKLGME021021) （武汉岩土所）
