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钻具折断是钻探中常见事故，有时钻杆断头弯曲于溶洞或坍塌成“洞”的孔段，很难找到断头。为了扶正钻杆和找到断头，通常下钻杆勾子去捞取、扶正。这种钻杆勾子由于上部套管和孔径的限制不能增长，如上部是108套管，在91孔径中勾子最大长度就不能大于95毫米，否则下不去。由于勾子长度小，在大溶洞中捞取钻杆就不起作用。为了捞到钻杆，必须加大勾子的长度，尽可能使勾子和孔壁能碰到，这样钻杆就易于找到。为此目的，我队工人总结了实践中的经验，
Drill breakage is a common accident in drilling, and sometimes the drill pipe breaks in the cave or caved into a “hole” of the hole, it is difficult to find broken ends. In order to right the drill pipe and find the broken head, usually under the hook hook to fishing, righting. This drill stem hook due to the upper casing and the aperture can not grow, such as the top is 108 bushing, hook in 91 aperture maximum length can not be greater than 95 mm, otherwise can not go. Due to the small length of the hook, fishing in a large cave drill pipe does not work. In order to catch the drill pipe, the length of the hook must be increased so that the hook and the hole wall can meet as much as possible so that the drill pipe can be easily found. To this end, my team workers summed up the experience in practice,