基于COMSOL Multiphysics的煤岩体渗流规律研究

Research on Seepage Law of Coal and Rock Mass Based on COMSOL Multiphysics

随着全球工业的快速发展,大气中急剧增加的CO2排放量导致了温室效应等复杂的气候变化.基于COMSOL Multiphyscis多场耦合软件建立数值计算模型,研究了CO2在煤岩体中的渗流耦合规律.结果表明:随着CO2气体在煤层中渗流,煤层的有效压力增加,煤层渗透率随着煤层压力的增大而逐渐减小;煤层渗透率的减小,减缓了气体压力向右端的传递,煤层压力最终达到CO2的初始注入压力3MPa时,渗流停止.研究结果对CO2的地质封存(简称CCS)具有较大的理论价值和指导意义.

With the rapid development of the global economy,the rapid increase of CO2 emissions in the atmosphere has led to complex climate change. Based on the multi field coupling software COMSOL Multiphyscis,a numerical model was established to study the seepage coupling law of CO2 in coal and rock mass. The results show that: with the CO2 gas seepage in coal seam,effective pressure increases,the permeability decreases with the increase of coal seam pressure; the decrease of coal seam permeability slows down the transmission of gas pressure to the right side,and the coal seam pressure finally reaches the initial injection pressure of 3MPa,and the seepage stops. The results of this study have great theoretical value and guiding significance for the geological storage of CO2( CCS).