高位定向长钻孔在祁南煤矿泥岩地层中的应用
Inner Mongolia Coal Economy(2019)
Abstract
利用高位定向长钻孔成孔技术,配套大功率钻机及其钻具系统,针对不稳定破碎的泥岩地层,采用定向钻进、回转钻进、回转扩孔钻进的混合钻进工艺方法,成功应用于祁南煤矿34下6工作面高位钻孔施工,并下入筛管护孔,创造最大下入深度692m的深度记录.
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