Gas Drainage Parameter Numerical Simulation Of Pre-extraction Coal Seam And Application In Jianjiahe Coal Mine

Gas disaster was one of the main factors affecting coal mine safety production, and pre-pumping coal seam gas is a solution of such accidents the most fundamental and most effective measures. To enhance gas extraction rate of Jiangjiahe coal mine face and prevent the disaster caused by the gas, the article based on the character of seam gas store and the theory of seam gas flow, according to the flow regularity of fluid in more hole media.take the flow field around drilling as research object, establish pre-pumping coal seam gas mathematic model, and use COMSOL numerical simulation software, to analysis different suction pressure of the drainage, different drilling diameter, different extraction times and different drilling spacing causing the impact to pre-pumping coal seam gas drainage effect.Through the simulation, discovery drilling diameter, pitch of holes, drainage times larger impact on the effective drainage radius around the drill, according to the simula-tion results and field conditions, defining rational gas drainage parameters. At the same time, for determining the extraction parameters for application testing, and achieved good drainage effect.