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钻孔拉槽是在钻孔弯曲度较大，地层硬度适宜的条件下，起钻过程中钻具对孔壁摩擦，冲拉而形成的一种孔壁形状。钻孔拉槽给安全施工带来极大的威胁，起钻操作中随时都有卡钻的危险。由于钻探工程的隐蔽性和复杂性，给正确地判断孔内情况带来很大的盲目性，所以人们往往将拉槽卡钻误认为孔壁缩径或掉块卡钻，并由此导致错误的处理方案，使事故复杂化，或者使事故无法进行处理。
Drilling trough is a kind of hole wall shape formed by friction and punching of the drilling tool on the hole wall during the drilling process under the conditions of larger curvature of the drilling and suitable hardness of the formation. Drilling trough to the safety construction of a great threat to the drilling operation at any time have the risk of stuck. Due to the hidden nature and complexity of the drilling project, it is very blind to correctly judge the situation inside the hole, so people often mistake the slotted chuck as a hole with a reduced diameter or a stuck-in block, which leads to errors Of the treatment program to complicate the accident, or make the accident can not be processed.