The failure of collar connection thread is one of the prime drill tool failures.

石油钻铤螺纹联接失效是钻具失效的主要类型。

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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.

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。

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The compatibility of deformation may occur on tube thread according to dimension of collar thread, which is helpful in improving the connection quality.

油管螺纹与接箍螺纹联接后会发生变形协调，有利于提高螺纹联接质量。

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Instead, the major white collar prosecutions since 2008 have come largely in the insider trading setting, and those have had no direct connection to the credit crisis.

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