摘要
根据煤层瓦斯流动方程、煤体变形方程以及孔隙率渗透率变化方程建立钻孔抽采耦合数学模型,通过COMSOL Multiphysics对原始瓦斯压力1.5 MPa和瓦斯压力下降到1 MPa钻孔抽采过程中瓦斯压力变化和渗透率变化规律进行模拟,利用模拟结果得到煤层在瓦斯抽采过程中钻孔有效抽采半径的变化规律。
According to the coal seam gas flow equation, the coal body deformation equation, porosity and permeability change equation, the drilling extraction coupled mathematical model is established, through COMSOL Multiphysics to simulate the original gas pressure 1.5 MPa and the gas pressure drop to 1 MPa that borehole gas pressure change and permeability change law during the process of extraction, use the simulation results can get the effective extraction radius change rule from coal seam in the process of drilling extraction.
出处
《煤炭技术》
CAS
北大核心
2016年第7期214-215,共2页
Coal Technology
关键词
耦合
数值模拟
瓦斯抽采
渗透率
有效抽采半径
coupling
numerical simulation
gas extraction
permeability
effective extraction radius
