Wangjialing Mine, China Coal Huajin Group Co., Ltd.

针对王家岭矿煤层透气性差、抽采难度大、抽采效果差及抽采时间长等实际问题,以王家岭矿12315工作面为工程背景,采用工程试验和对比分析的研究方法,研究煤层注热改性强化后2号煤层瓦斯抽采效果,并通过对比试验分析注热前后瓦斯抽采效果,明确原位改性强化瓦斯抽采的可用性。结果表明:对比注热前后以及未改性的抽采钻孔,较注热改性前的平均混合流量提升2.5~3.1倍,较注热改性前的平均纯量提升2.8~3.9倍,达到了预期目标,大大缩短了煤层气的抽采时间。工程试验结果可用于指导现场瓦斯抽采工作,并为类似矿井提供借鉴和指导。

In view of the practical problems of poor coal seam permeability, large difficult of extraction, poor extraction effect, long extraction time and so on in coal seams of Wangjialing Mine, taking the 12315 working face of Wangjialing Mine as the engineering background, the research methods of engineering testing and comparative analysis are adopted to study the gas extraction effect of the No. 2 coal seam after coal seam heat injection modification and enhancement. Through comparing the experiments, the gas extraction effects before and after heat injection are analyzed, and the usability of in-situ modified enhanced gas extraction is clarified. The results show that the average mixed flow rate before and after heat injection and unmodified extraction boreholes increases by 2.5-3.1 times compared to before heat injection and modification, and the average purity increases by 2.8-3.9 times compared to before heat injection and modification, achieving the expected goals and greatly shortening the extraction time of coalbed methane. The results of engineering testing can be used to guide on-site gas extraction work and provide reference and guidance for similar mines.