筛孔管护孔技术在松软煤层瓦斯抽采中的应用

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针对松软煤层孔壁不稳定易塌孔,影响钻孔下筛管深度和预抽效果的问题。文章介绍了钻杆内下筛孔管护孔设备及技术,通过在首山一矿的应用,解决了松软煤层易塌孔堵塞钻孔,造成封孔筛管下不到位的问题,实现了钻孔“打多深、管多深、抽多深”,提高了钻孔瓦斯抽采浓度,缩短了预抽达标时间,节省了下筛管时间,提高了劳动效率,保障了瓦斯治理和安全生产。
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