突出煤层先注后冲防喷孔消突技术研究

发布时间：2018-07-29 08:30

【摘要】：为了解决煤与瓦斯突出煤层穿层钻孔施工和水力化措施期间的瓦斯喷孔问题,通过实验和分析研究了水对瓦斯煤流固耦合系统解吸和渗流的影响。煤体含水率增加后,瓦斯解吸的初速度下降,解吸量变小;煤层中注水后,煤体吸附瓦斯量减少,游离瓦斯量和煤的渗透率增加,瓦斯流动更容易,二者共同的影响减少了瓦斯喷孔发生概率。现场实验表明:先注后冲技术降低喷孔率39%,钻孔成孔率提高32%,冲泄煤量提高2.3倍,瓦斯抽出率平均提高10.4%。先注后冲技术与传统水力冲孔技术相比能明显抑制瓦斯喷孔、增加冲泄煤量、提高瓦斯抽出率,是一种安全可靠的煤层增透和预防瓦斯喷孔技术。
[Abstract]:In order to solve the problem of gas jetting hole in coal and gas outburst coal seam during drilling and hydraulic measures, the influence of water on the desorption and seepage of gas-coal fluid-solid coupling system was studied through experiments and analysis. With the increase of water content of coal body, the initial velocity of gas desorption decreases and the desorption volume becomes smaller. After injecting water into coal seam, the amount of gas adsorbed by coal body decreases, the amount of free gas and permeability of coal increases, and the flow of gas becomes easier. The effect of both reduces the probability of gas injection hole. The field experiments show that the injection and then flushing technology reduces the injection rate 39, the drilling hole formation rate increases 32%, the coal discharge volume increases 2.3 times, and the average gas extraction rate increases 10.4%. Compared with the traditional hydraulic punching technology, the technology of first injection and later flushing can obviously restrain the gas injection hole, increase the amount of coal flushing and increase the rate of gas extraction. It is a safe and reliable anti-penetration and prevention technology of gas injection hole in coal seam.
【作者单位】：河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地;河南理工大学安全科学与工程学院;煤炭安全生产河南省协同创新中心;
【基金】：国家自然科学基金项目(51374095,51404099) 河北省矿井灾害防治重点实验室开放基金项目(KJZH2014k05)
【分类号】：TD713.3

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