Optimization and Practice of the Efficient Gas Control Mode for Hard-to-Drain Coal Seam Gas in Sima Coal Industry

Abstract

Due to the complex geological structure and poor permeability of the coal seam in Sima Coal Mine, the gas extraction concentration is low, the flow is small, the attenuation is fast, the efficiency is low, and the standard time is long. Based on the analysis of gas geological conditions, gas extraction parameters and current situation of Sima Coal Industry, the efficient gas control mode of return air corner buried pipe drainage, roof fracture zone drilling drainage technology, hydraulic slotting and hydraulic punching technology is designed, and the applicable conditions and key technical parameters are optimized. According to the practical effect, the design of buried pipe drainage in the return air corner of ' five trips, six parts and one cycle ', as well as the hydraulic punching hole + bedding hole drainage solved the practical problem of gas difficulty in Sima Coal Industry, and effectively improved the concentration and purity of gas drainage.