Numerical analysis of coal seam heat injection

Abstract

Coal seam heat injection is a new type of enhanced gas drainage method. In order to obtain the influence law of coal seam heat injection on the gas content in coal, the coupled equation of heat, fluid and solid multiphysics under coal seam heat injection is used to solve it with the help of numerical analysis software. the law of coal gas content change under the condition of coal seam heat injection is obtained: During the process of coal seam heat injection, the temperature of the coal near the heat injection borehole is relatively high. With the increase of the heat injection temperature, the adsorbed gas content in the coal gradually decreases, the free gas increases, and the residual gas content of the coal decreases more significantly. The extraction time was effectively shortened, and the expected goal of heat injection enhanced extraction was achieved.