Model development and simulation study of the feasibility of enhancing gas drainage efficiency through nitrogen injection

Pre-gas drainage plays a significant role in the prevention of coal and gas outburst in underground coal mines. However, difficulties of reducing the content of coal seam gas, especially localized coal seam CO2, to be below threshold values within a given drainage lead time have been encountered in numerous coal mines in Australia. As the proneness of nitrogen outburst is way smaller than CO2 or methane outburst, nitrogen injection would be an...