双马煤矿废弃油井周围煤层H2S分布特征及其采掘影响范围划分

针对废弃油井周围煤层H2 S分布规律不清楚,采掘过程中影响范围不明确给煤矿安全开采造成严重威胁的难题,以煤油重叠区的双马煤矿为研究区,首先采用数值模拟方法研究了煤层内H2 S气体的渗流规律,然后结合数值模拟结果通过气体成分测试获得了H2 S气体的分布规律,最后根据采掘过程中H2 S气体的涌出规律对其影响范围进行了确定.结果表明:废弃油井周围H2 S气体浓度随距离废弃油井增加呈递减分布,废弃油井内气体压力越高,H2 S气体渗透范围越大;工作面过废弃油井过程中H2 S气体浓度呈现出较高—降低—平稳—降低—急剧下降的变化规律;双马煤矿废弃油井影响区煤层H2 S气体的渗透半径为500 m,采掘影响范围为700 m.研究结果为工作面H2 S气体的治理提供指导.

Distribution characteristics of H2S in coal seams around abandoned oil wells and division of its mining influence range

In view of the unclear distribution law of H2S in coal seams around abandoned oil wells and the unclear influence range in mining process, taking Shuangma Coal Mine in kerosene overlapping area as the study area, firstly, the seepage law of H2S in coal seams was studied by numerical simulation method, and then the distribution law of H2S was obtained by gas composition analysis combined with numerical simulation results. Finally, the influence range was determined according to the emission law of H2S in mining face. The results show that the concentration of H2S around abandoned oil wells decreases with the increase of distance from abandoned oil wells, and the higher the gas pressure in abandoned oil wells, the larger the penetration range of H2S gas. When the working face passes through the abandoned oil well, the concentration of hydrogen sulfide gas shows a high-decrease-steady-decrease-sharp decrease; The permeability radius of coal seam in the affected area of abandoned oil wells in Shuangma Coal Mine is 500m, and the mining influence range is 700m, which provides guidance for the treatment of hydrogen sulfide gas in working face.