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某矿区104孔设计孔深300米，方位200°，倾角77°/70°曲线设计。钻孔所穿岩层为变质砂岩、砂质板岩、板岩互层，层次变化频繁，节理比较发育，可钻性6～7级。该孔钻到263.4米结束，但在110～230米孔段岩、矿心采取率低未达到设计要求，需补采岩、矿心，故从87米处导斜补采，但钻到159.4米时，由于扫脱落岩心，把导斜器全部破坏，不能继续钻进。若提到上部重新导斜，则要浪费80多米进尺，若不进行处理，则全孔报废，浪费更大。经研究后，决定在原导斜器位置重新下入导斜器，结果成功，仅用7个小班时间恢复了正常钻进。
104 holes in a mining area design hole depth of 300 meters, the direction of 200 °, inclination 77 ° / 70 ° curve design. The strata to be drilled are metamorphosed sandstone, sandy slate and slate interbedded with frequent changes in layers and relatively developed joints with drillability of 6-7. The hole drilled to the end of 263.4 meters, but in the 110 to 230 meters hole rock, low ore mining rate did not meet the design requirements, the need to complement mining rock, ore, so from 87 meters at the edge of the slope complement mining, but drill to 159.4 Meter, due to swept off the core, the destructor all destroyed, can not continue to drill. If you refer to the upper re-guide ramp, you have to waste more than 80 meters footage, if not for processing, the entire hole scrapped, wasting more. After the study, decided to re-enter the inclinometer in the original guide inclined position, the result was successful, only 7 small class time to resume normal drilling.