西安科技大学学报2025，Vol.45Issue(3)：500-511,12.DOI:10.13800/j.cnki.xakjdxxb.2025.0308
CO2封存下煤参数对煤层压力与渗透性影响的数值模拟
Numerical simulation of influence of coal parameters on coal seam pressure and permeability under CO2 storage
摘要
Abstract
In the face of the continuous increase in global CO2 emissions,coalbed CO2 geological se-questration has attracted significant attention as a promising carbon reduction technology.However,re-al-time monitoring of this process is not feasible,and numerical simulation is needed to reveal the vari-ation laws mechanisms of physical propertiesin coal reservoirs during CO2 sequestration.The COMSOL Multiphysics platform is utilized to construct a three-dimensional fluid-solid coupling model,with the dynamic process of CO2 injection into coal seams similated.The results show that when gas injection comes to a stop,an increase in the initial coalbed permeability accelerates the rise in matrix and frac-ture pressures but slows down the rate of fracture pressure increase and causes a rapid decline in rela-tive permeability.Increasing the coalbed diffusion coefficient accelerates the equilibrium of coalbed ma-trix pressure,fracture pressure,and permeability,which has a limited effect on their final values.Gas injection pressure is positively correlated with coalbed internal pressure but has a limited influence on permeability.At the end of gas injection,matrix and fracture pressures significantly increase near the injection well,accompanied by coalbed expansion and fracture extension,which substantially alter per-meability characteristics.The research findings demonstrate the response relationships between coalbed property parameters and critical mechanical indicators,providing significant theoretical references for optimizing coalbed CO2 sequestration process parameters and guiding field implementations.关键词
CO2煤层封存/初始渗透率/注气压力/扩散系数Key words
CO2 coal seam sequestration/initial permeability/gas injection pressure/diffusion coeffi-cient分类
矿山工程引用本文复制引用
丁洋,周煜尧,李树刚,林海飞,朱冰,张一正,张艳,王梦迪,汤远卓..CO2封存下煤参数对煤层压力与渗透性影响的数值模拟[J].西安科技大学学报,2025,45(3):500-511,12.基金项目
国家自然科学基金项目(52374227) （52374227）
陕西省自然科学研究计划项目(2024JC-YBMS-255) （2024JC-YBMS-255）
