我队在某矿区9号孔施工中,由于下钻前对钻具检查不周,以及钻进中压力掌握不当,连续发生钻头脱落事故数次。每次都用下述简易方法捞取,效果很好。用半米长的、比钻头小一级的岩心管一根,下端锯成马蹄形,插入事故钻头 My team in the construction of a No. 9 hole in a mining area, due to undead drill rig inspection before drilling, as well as improper drilling pressure control, drill bit consecutive occurrences fall off several times. Every time using the following simple method of fishing, the effect is very good. With a half-meter long, smaller than the bit of a core tube, saw the lower end into a horseshoe-shaped, insert the accident bit