Abstract:The coal seam permeability in the mining area of the 111103 working face is poor, the pumping efficiency is low, the standard period is long, the regional geological conditions are complex, and the structural area is easy to accumulate gas, which causes gas accidents. In order to solve this problem, the comprehensive index method was used to analyze and evaluate the gas treatment measures of the working face, and it was found that the traditional pre-pumping borehole could not meet the requirements of the coal seam gas treatment. Numerical simulation analysis shows that there is still a blank zone for gas extraction for 12 months. The main factor that leads to the long period of gas extraction is the poor air permeability of the coal seam. The CO2 fracturing and permeability enhancement measures are used to carry out comprehensive gas treatment, and the maximum extraction concentration of low permeable coal seam after fracturing reaches 90%, and the attenuation is small, and the pumping can reach the standard after 6 months of pumping, and the extraction effect is remarkable. The tectonic area was continuously pumped after fracturing and permeability, and the effect was remarkable.
