概况近二十年来,我队在个旧松树脚矿区,共完成坑内钻探工作量20多万米。平均钻孔深度163米,水平孔最大深度360.24米,下垂孔(包括下斜孔)最大深度605.20米。所钻岩层多种多样,可钻性4～9级。矿区的钻进特点是:①土状氧化矿遇水坍塌,风化夕卡岩、白云岩结构疏松,影响了采心率;②未风化的夕卡岩、花岗岩致密坚硬,其中少量岩石可钻性高达10级,钻进效率低,常出现“打滑”现象;③受隆起、挠曲、倒转褶皱等构造影响和断裂切割,地层破坏严重。钻探中易发生坍掉,加之裂隙、 Over the past two decades, our team completed a total drilling workload of more than 200,000 meters in the Gejiu pine foot mining area. The average drilling depth of 163 meters, the maximum horizontal hole depth of 360.24 meters, sag hole (including the down hole) the maximum depth of 605.20 meters. Rock drilled a variety of drills, drillability of 4 to 9. The characteristics of drilling in the mining area are as follows: (1) The earth-type oxide mine collapses with water, the weathered skarns and dolomites have loose structure, affecting the mining heart rate; (2) unweathered skarn and granite are dense and hard, 10, drilling efficiency is low, often “slippery” phenomenon; ③ by the uplift, deflection, reverse folds and other structural impact and fracture cutting, serious damage to the formation. Drilling prone collapse, combined with cracks,