Based on the statistics, 86%of tubing failure occurs in the place of thread joint, the failures of thread joint have two aspects, seal failure and slippage failure.

据统计，油管失效86%发生在螺纹联接处，而螺纹联接失效表现在两个方面：密封失效和滑脱失效。

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The reasons caused seal and slippage failure are complicated, the most important factor was the thread gluing reduced the intensity and the sealing property of the thread joint.

造成密封和滑脱失效的原因较为复杂，最重要的因素是螺纹粘扣降低了螺纹联接的强度和密封性能。

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