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

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.