连接接头滑脱失效是圆螺纹套管损坏的主要形式。
Pull-out failure is the main damage form of round thread casing connections.
引鞋的外部由钢制成，一般与套管的尺寸和螺纹匹配，如果钢级不匹配的话。
The outer portions of the guide shoe are made from steel, generally matching the casing in size and threads, if not steel grade.
该项目是加工各类油井管螺纹、套管接箍的机械加工项目。
The program is to process all kinds of oil well pipe thread and casing coupling.
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