fatigue-failure of drill string
... fatigue-failure of drill string 钻杆疲劳破坏 fatigue failure, 疲劳破裂 ; 疲惫破裂 structural fatigue failure 结构疲劳损坏 ...
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井斜对钻具的影响有关理论已经证明，如果井斜角大于某一临界值，在狗腿处旋转钻杆将会引起严重的疲劳破坏。
The related theory that the drilling tool is affected by the inclination of the well had proved the fact: if the Angle of the well is greater than a threshold, there will be se.
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