Effective Radius of Gas Extraction Based on Hydraulic Punching Technology
The main mining roadways of the 3-2 coal seam in Xinzhuang Coal Mine adopt hy-draulic punching technology to improve the gas extraction effect due to the low permeability of the coal seam.Therefore,it is necessary to determine and compare the effective extraction radius by numerical simulation and field measurement before arranging the extraction boreholes.The re-sults showed that:the effective drainage radius was 2.81 m when the extraction time of cross-seam boreholes in the coal seam was 180 d;the effective drainage radius was 3.65 m when the ex-traction time was 120 d after adopting hydraulic punching based on the coal unloading volume of 0.5 t/m;the effective extraction radius was 5.5 m when the extraction time of bedding direction-al boreholes was 120 d.There is no significant difference between the numerical simulation and field measurement results,which could provide theoretical guidance for on-site gas extraction.
gas extractionnumerical simulationpressure drop methodflow method
万方数据
维普
