... 弓形领 arched collar 棒形领 stick collar 踏板形领 pedal collar ...
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The failure of thread stick has nothing wrong with drilling collar and thread machining, it is only cause by uncorrected operation on site.
通过试验分析，认为钻铤材质和螺纹加工质量合格，钻铤粘螺纹与钻铤材质和加工质量无关，其主要原因是井队操作不当所致。
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