水平分支孔定向钻探技术及其在煤矿水害防治中的应用——以东庞煤矿ZKxx3孔钻探施工为例

本文以东庞矿北井9400采区2#煤层奥灰含水层区域注浆改造一期工程ZKxx3孔施工为例，详细介绍了水平分支孔定向钻探施工设计、钻探施工工艺、主要技术措施等。实践证明，该定向钻探技术能够探查奥陶灰岩含水层区域中的断层、陷落柱等构造的导水通道和富水层段，超前注浆充填奥陶系灰岩上部溶隙和裂隙，封堵断层等构造薄弱区段，扩大加固面积，实现由井下局部治理向地面区域治理煤层底板奥灰水害。由超前探测向掘前治理转变，在时空上达到了区域超前防治水害的目的，取得了显著的经济及环境效益。

Application of directional drilling technology of horizontal branch hole in the drilling of ZKxx3 hole in Dongpang Coal Mine water disaster prevention and control

Taking the construction of ZKxx3 hole in the first stage of grouting reconstruction of no. 2 coal-ornite aquifer in north well 9400 dongpang mine as an example, this paper introduces in detail the construction design, drilling technology and main technical measures of directional drilling for horizontal branch hole. Practice proved that the directional drilling technology as much as possible to probe into the ordovician limestone aquifer fault and collapse column structure of the area of the water channel and rich water, advance grouting filling the upper ordovician limestone dissolution gaps and cracks, jig faults and tectonic weak section, expand the reinforcement area, to realize the local management to the ground area management by underground coal floor Mr Grey water disasters, from the advanced detection to dig governance before, met the area ahead of the prevention and control of water disasters objectives in time and space, has achieved remarkable economic and environmental effects.