在需要弯曲时，应尽量取弯曲半径大的走向，以降低钢丝绳和护套管间的摩擦力。
When bending needed, better to adopt larger trend of bending radius so as to lower the friction between cable and casing.
通常用钢丝绳或挠性管下入的一种井下工具。它利用聚能射孔弹割断周围的油管或套管壁。
A downhole tool, generally run on wireline or coiled tubing, that USES the detonation of a shaped explosive charge to cut the surrounding tubing or casing wall.
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