关键词: 煤层气, 注气驱替, 热-流-固耦合, 对流弥散

Abstract: According to the thermoelasticity, convention and dispersion theory and porous medium thermodynamics, the thermal-hydrological-mechanical coupling equations of enhancing coal bed methane have been established in terms of coal deformation, gas migration and heat transport. The numerical solution has been presented in order to investigate the effect of the temperature field on the gas migration in enhancement of coal bed methane. It demonstrates that rising temperature can promote desorption of coal bed methane and quicken coal bed methane production. The results can provide a corresponding theoretical basis for engineering practices of exploiting coal methane, more over it can be referred by the technology of draining gas before extracting coal gassy mining in deep coal seam.

Key words: coal bed methane, enhancement of coal bed methane；thermal-hydrological-mechanical