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在水平钻井中，当旋转的钻柱通过造斜段、弯曲段时，由于循环弯曲应力而造成钻柱的疲劳损伤；损伤是可以积累的，钻柱每旋转一周时将受到一次疲劳损伤，钻柱的寿命与疲劳损伤积累有关。文中研究了水平钻井钻柱疲劳损伤评估、检测优化、缺陷评定、钻柱疲劳寿命预测及可靠性的分析与评估．并提出了相应的计算模型，编制了程序软件。该软件可计算和预测钻柱组合中任一钻柱单元在钻井过程中所受的疲劳损伤、剩余疲劳寿命，可以连续动态跟踪预测某一钻柱在各并段钻进过程中受力和交变弯曲的数值大小，较之ＡＰＩ规范推荐的图解法在精度上有较大提高；对钻柱的合理使用与监控具有重要参考价值。
In horizontal drilling, when a rotating drill string passes through a beveling section or a bending section, the fatigue damage of the drill string is caused by cyclic bending stress. The damage can be accumulated, and once the drill string rotates one time, a fatigue damage and drilling The life of the column is related to the accumulation of fatigue damage. In this paper, the fatigue damage assessment, testing optimization, defect evaluation, fatigue life prediction and reliability analysis and evaluation of horizontal drilling drill string are studied. And the corresponding calculation model is put forward and the program software is compiled. The software can calculate and predict the fatigue damage and residual fatigue life of any drill string unit in the process of drilling, and can continuously and dynamically predict the stress and cross of a certain drill string during the drilling of each section The numerical value of the bending is greatly improved compared with the graphical method recommended by the API specification. It is of great value to the rational use and monitoring of the drill string.