Fatigue Strength Evaluation of Drill Pipe Constantly Bent In Strong Current

Fatigue Strength Evaluation of Drill Pipe Constantly Bent In Strong Current
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强水流中持续弯曲钻杆的疲劳强度评估

DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Koji Setta
Koji Setta
中科院分区：
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文献类型：
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作者：
Tomoya Inoue;M. Ozaki;T. Miyazaki;M. Nishigaki;Koji Setta

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在强水流钻井作业中，钻柱会不断弯曲。而通过旋转钻柱进行钻井作业会导致弯曲应力转变为循环应力。因此可能会导致疲劳损伤。通过疲劳试验得到用力矩M和失效循环次数N表示的疲劳强度曲线。并且通过应用修改的古德曼图概念来修改，考虑到总是施加的轴向应力。假设钻柱因水流而倾斜一定角度，分析钻杆力矩分布。然后，用累积损伤率表示即可得到疲劳损伤水平。
During drilling operation in strong current, drill string will be constantly bent. And the drilling operation by rotating the drill string will lead a bending stress to a cyclic stress. Consequently it may cause the fatigue damage. Fatigue strength curve expressed with moment M and the number of cycles to failure N is obtained from the fatigue test. And it is modified by applying the modified Goodman diagram concept considering an axial stress which is always exerted. The moment distribution of drill pipe is analyzed under the assumption that the drill string is inclined in a certain angle due to the current. Then, fatigue damage level can be obtained by expressing with cumulative damage ratio.