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一、钻孔上帮沟槽卡钻事故1．所谓上帮沟槽问题，即在钻进过程中钻孔井壁上帮形成的沟槽（简称上沟槽一下同）。这类沟槽形成的条件：（1）钻孔深度较大，一般在500米以上，施工周期较长；（2）上部孔段突然上漂，例如白银矿区ZK13—61孔，0～100米倾角保持88°，100～200米上漂12°，200～300米上漂1°30′，300～700米平均百米上漂6°30′。钻孔在100～200米处倾角突然上漂，在100～250米处形成上沟槽，多次发生沟槽卡钻现象；（3）突然弯曲孔段的岩石较软或有断层破碎带；（4）在减压孔段。
First, drill holes to help the accident card slot 1. The so-called upper groove help, that is drilled in the drilling process to help the formation of the trench shaft (referred to as the groove about the same). The conditions for the formation of such grooves: (1) drilling depth larger, usually at 500 meters above, the construction period is longer; (2) the upper hole suddenly floated on, for example, silver mining ZK13-61 hole, 0 to 100 meters Inclination angle of 88 °, drift of 12 ° from 100 to 200 m, drift of 1 ° to 30 ° from 200 to 300 m and 6 ° to 30 ° on average from 300 to 700 m. Drilling at 100 ~ 200 meters at a sudden dip on the inclination, the formation of the upper groove in the 100 ~ 250 meters, multiple groove card stuck phenomenon; (3) suddenly bent hole section of the rock is soft or fault broken belt; (4) in the decompression hole segment.