Research on the Influencing Factors of Gas Extraction in Boreholes Based on COMSOL Numerical Simulation
Gas extraction is an important means for the prevention of coal mine gas disasters,and the effectiveness of gas extraction is influ-enced by various factors.A multi-field coupling model for gas extraction was constructed,and COMSOL software was used to numerically simulate the parameters of gas extraction along coal seam.Under different borehole aperture and coal seam permeability,the variation of effective extraction radius,extraction standard area and gas extraction rate were researched.The results show that the effective extraction radius,extraction standard area and gas extraction rate are all positively correlated with the coal seam permeability,and increase with the increasing borehole diameter.
gas extractionnumerical simulationinfluencing factorsmulti-field coupling
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