小直径分支孔技术在贵州省富矿精开中的应用探索

Exploration of the application of smal1-diameter branch hole technology in the fine mining of rich ores in Guizhou Province

摘要:

按照贵州省富矿精开和新一轮战略找矿行动工作安排，为深入贯彻落实绿色勘查理念，同时解决Ⅰ级水源保护地内禁止施工的难题，采用“1直孔+1分支”的钻孔方案实施钻孔。根据靶区信息、主孔地层条件、螺杆造斜理论和设备确定了侧钻分支和取心工艺，实现了自主孔垂深426 m处成功侧钻分支，并成功中靶，中靶精度8.01 m。通过本次的定向钻探实践，摸索出了不同钻头和螺杆钻不同规格弯外管组合钻进的造斜能力，寻找到了适合于绳索取心钻进的造斜强度控制参数，为同类绿色勘探、精准勘探技术配套提供了技术支撑。

Abstract:

In accordance with the work arrangements for the fine mining of rich minerals and the new round of strategic mineral exploration in Guizhou Province， in order to thoroughly implement the concept of green exploration and at the same time solve the problem that construction is prohibited in the first-level water source protection area， the drilling scheme of "1 straight hole +1 branch" is adopted for drilling. Based on the target area information， formation conditions of the main hole， screw skewing theory and equipment， the lateral drilling branch and coring process were determined. The lateral drilling branch was successfully drilled at a vertical depth of 426 m in the autonomous hole and hit the target with a target accuracy of 8.01 m. Through this directional drilling practice， the incline capacity for different drill bits and screw drills with different specifications of curved outer tubes was explored， and the incline strength control parameters suitable for rope coring drilling were found， providing technical support for the matching of similar green exploration and precision exploration technologies.