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钻探施工中,由于孔内阻力过大或操作不当而造成钻杆折断,是一种常见的事故.当折断处孔壁超径或钻杆断头上端紧靠孔壁时,处理起来困难更大.例如我们施工的一个钻孔,在孔深196.7米处钻杆折断,先后用一般方法处理13小
It is a common accident that the drill pipe should break due to excessive resistance in the hole or improper operation during drilling construction, which is more difficult to handle when the wall of the hole at the breakage is overshot or the upper end of the drill pipe breakage is close to the hole wall. A hole drilled in our construction was broken at a hole depth of 196.7 meters and was treated 13 times in the normal way