Abstract
Surface well extraction is an important part of coalbed methane development in coal mine area. Taking the 1303 (lower) fully mechanized working face of Yuecheng coal mine as the research object, considering the characteristics of coal and rock accumulation in the three areas of goaf, this paper uses COMSOL numerical software to simulate and analyze the gas migration characteristics of the goaf where the surface wells are located along the strike and inclination of the working face. The results show that the gas concentration in goaf decreases gradually with the progress of drainage, and surface wells in different shaft location basically reach the balance in about 2000s. The shaft location of the surface well and the gas concentration in the upper corner are exponential function. In order to ensure the safety of coal production, the distance between the well distribution and the working face should be controlled within 240m, and close to the area near the return air lane. The research results provide a reference for the selection of surface well location.
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