【摘要】 通过对侧钻井用钻杆材料的疲劳性能试验 ,得到了钻杆材料P S N曲线 ,在此基础上获得修正的钻杆柱P S N曲线 ,提出了一种描述侧钻井钻柱疲劳损伤的新方法 ,即采用理论简化的办法 ,先获得钻杆材料标准试样的P S N曲线 ,再考虑钻杆的形状、尺寸、表面加工方法、应力状况等影响 ,将钻杆材料的P S N曲线转化为钻杆柱的P S N曲线 ,来进行疲劳强度的评估。将此方法运用于胜利油田井下作业公司侧钻井钻杆柱的优化设计 ,对钻具组合做了必要的修正、完善后 ,使钻杆柱所受疲劳损伤降至最低程度 ,从而延长了钻杆柱的使用寿命更多还原

【Abstract】 Through the fatigue performance test of material of drill pipes used for sidetrack drilling, the P-S-N curve of the drillpipe material is obtained, thereby a revised P-S-N curve is derived. And a new method for describing the fatigue damage of the drill string in side tracked holes is put forward. The new method is used for optimum design of drill string in side tracked holes drilled by Shengli Oilfield Downhole Operation Company, reducing farthest the fatigue damage of the drill string, therefore extending the service life of the drill string.更多还原