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在水文钻孔中结合地质勘探的需要施工分枝定向孔，可以扩大受控定向钻探的应用范围。我们根据水文钻孔口径大的特点，将水文孔作主孔，钻到一定孔深，先施工分枝孔，最后完成主孔。实践证明：不仅可节约时间，还可避免由封孔架桥质量不好而引起的事故。一、地质要求与设计1．地层及要求 龙门山矿区地层主要有：角砾岩、闪长岩、矽卡岩、磁铁矿、铜矿等。岩石可钻
The combination of the need for geological exploration in hydrologic boreholes requires the construction of branch directional holes, which can expand the range of applications for controlled directional drilling. According to the characteristics of large hydrological borehole, the hydrological hole as the main hole, drilled to a certain hole depth, the first construction branch hole, and finally completed the main hole. Practice has proved that: not only can save time, but also to avoid the poor quality of the bridge caused by the closure of the accident. First, the geological requirements and design 1. Strata and requirements Longmenshan ore strata are: breccia, diorite, skarn, magnetite, copper and so on. Rock can drill