青海省都兰县五龙沟矿区坑道钻探工艺研究

Study on Tunnel Drilling Technology for Wulonggou Mining Area of Dulan County in Qinghai

摘要:

针对青海五龙沟矿区3320平硐89线中段布设的坑道钻孔（SZZK8905、孔深700.20 m）在钻探施工中遇到的憋泵、孔壁坍塌、缩径、回次进尺少、岩心采取率低等问题，在钻机选取、钻孔结构设计、破碎带取心技术、钻井液等方面开展坑道钻探工艺研究，成功完成了该孔的钻探任务。

Abstract:

According to the pump blocking, hole collapse, diameter shrinkage, short footage per round trip and low core recovery appeared in the tunnel drilling of SZZK8905 which was in Wulonggou mine area in Dulan County of Qinghai with 700.20m in depth, the study on tunnel drilling was carried about rig selection, borehole structure design, coring technology in fracture zone and drilling fluid, and this hole drilling was successfully completed.