摘要
随着煤矿采深的不断延伸,所采煤层逐渐变为松软煤层。松软煤层具有瓦斯压力大,瓦斯含量高、透气性低等特点,预抽钻孔成孔后易发生塌孔现象,严重降低钻孔瓦斯排放通道的有效利用长度,导致钻孔瓦斯抽采效率低下、抽采周期变短、抽采达标时间延长等问题。为解决钻孔松软煤层预抽钻孔塌孔问题,针对性的选择余吾煤业公司N1101胶带巷作为试验地点,通过考察不同类型花管对于支撑钻孔稳定性及不同支护条件下瓦斯抽采纯流量的变化,确定筛眼密度和直径最优参数,从而增加钻孔瓦斯抽采纯流量,提高煤层瓦斯抽采率。
As China continues to extend deep coal mine,the coal layer gradually becomes soft coal seam. Soft coal seam has a gas pressure,high gas content,permeability and low,the effective use of pre-drainage prone length into the hole after drilling the hole wall collapse,would seriously reduce drilling gas discharge passage,and eventually produce Drill Gas Drainage inefficient mining,extraction cycle is shortened,prolonged drainage standards and other issues. To solve the drilling soft Predrainaging drilled hole collapse problems,targeted selection N1101 glue along as a test site,By examining the different types of flowers under the drilling pipe to the support and stability of different support conditions change pure gas drainage flow,and to determine the optimal mesh density and diameter parameters,thereby increasing the flow of gas drainage drilling,pumping Improve coal seam gas mining rates.
出处
《煤》
2016年第9期10-12,共3页
Coal
关键词
松软煤层
瓦斯抽采
全程下花管
soft seam
gas pre-pump
under bedding drilling technology
作者简介
徐宁（1989-）,男,山西屯留人,助理工程师,从事生产技术工作.
