石油钻铤螺纹联接失效是钻具失效的主要类型。
The failure of collar connection thread is one of the prime drill tool failures.
钻铤螺纹联结失效是钻铤失效的主要因素，在整个钻具失效事故中占很大比例。
The fatigue failure of drilling collar thread linking is a main factor of the drill collar failure, which accounts for a large proportion of the accidents in the drilling tool failure.
通过采用合适的对策，有效预防钻铤螺纹失效，从而保证钻铤螺纹的质量可靠性。
The correct countermeasures are taken to prevent the drill collar screw failure effectively, ensuring the qualitative reliability of drill collar screw.
以NC50型钻铤公螺纹作为研究对象，用有限元方法对加工有不同应力减轻槽的钻铤公螺纹接头进行了分析计算。
Take pin threads of NC50 drill collar as an example, Finite Element Method is used to analyze the different stress-relief grooves of pin thread connection.
因而钻铤内外螺纹的磁粉检测十分必要和重要。
As such, magnetic particle inspection for the screw thread of the drill collar is very necessary and important.
钻杆和钻铤等管状螺纹联接件是钻探和石油钻井工业中的关键设备。
Drill rod and collar are key apparatus in drilling exploration and well drilling industry.
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。
The failure of thread stick has nothing wrong with drilling collar and thread machining, it is only cause by uncorrected operation on site.
4英寸）钻铤NC35螺纹加工LE螺纹、应力槽、双台肩后进行了实物抗扭性能试验，证实双台肩钻铤具有很好的抗扭性能。
After processing LET thread, stress groove and double shoulder connection for the NC35 thread of Drill Collar in 43/4 inch, torsion tests were done.
4英寸）钻铤NC35螺纹加工LE螺纹、应力槽、双台肩后进行了实物抗扭性能试验，证实双台肩钻铤具有很好的抗扭性能。
After processing LET thread, stress groove and double shoulder connection for the NC35 thread of Drill Collar in 43/4 inch, torsion tests were done.
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