深部煤层渗透特征及首采关键层卸压改造技术

发布时间：2018-05-14 17:03

本文选题：深部煤层 + 突出煤层群　；参考：《煤炭科学技术》2017年06期

【摘要】：针对我国煤层开采地质条件复杂、含煤地层中煤层群广泛发育、突出煤层群瓦斯灾害严重的特征,采用理论分析、数据统计和工程实践相结合的方法,系统分析了我国深部煤储层渗透特征,即深部煤体呈天然粉化结构,微、小孔发育,渗透率通常小于10~(-6)μm~2;提出了应依据安全性、经济性和统筹规划的首采关键层选择内涵和首采关键层"钻孔卸荷"的理论模型,确定在埋深大于800 m时,吨煤钻孔长度、钻孔间距等定量化关键指标;在此基础上,介绍了我国采用地面井压裂、井下顺层钻孔和穿层钻孔改造首采关键层的技术途径,配合邻近层卸压瓦斯抽采方法构成立体瓦斯抽采模式,实现了高瓦斯突出矿井煤与瓦斯2种资源的安全高效开采。
[Abstract]:In view of the complex geological conditions of coal seam mining in China, the widespread development of coal seam group in coal-bearing strata and the serious gas disaster of outburst coal seam group, the method of combining theory analysis, data statistics and engineering practice is adopted. The permeation characteristics of deep coal reservoirs in China are systematically analyzed, that is, the deep coal bodies are naturally powdered, microporous, and permeability is usually less than 10 ~ (-6) 渭 m ~ (-2), and it is suggested that safety should be taken into account. The economic and overall planning of the first mining key layer selection connotation and the first mining key layer "borehole unloading" theoretical model, determine the buried depth of more than 800 m, tons of coal drilling length, borehole spacing and other quantitative key indicators, on this basis, This paper introduces the technical ways of reforming the first key layer by surface well fracturing, downhole drilling along the formation and drilling through the stratum, and combining with the gas extraction method of the adjacent strata to form a three-dimensional gas drainage model. The safe and efficient mining of coal and gas in high gas outburst mine is realized.
【作者单位】：中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室;中国矿业大学煤矿瓦斯治理国家工程研究中心;重庆大学煤矿灾害动力学与控制国家重点实验室;
【基金】：国家自然科学基金面上资助项目(51674252) 江苏省高校优秀中青年教师和校长境外研修计划资助项目(苏教办师[2015]7号) 江苏高校“青蓝工程”资助项目(苏教师[2016]15号)
【分类号】：TD712.62

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