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Research on Fatigue Life Prediction of Drill String
Author(s): 
Pages: 57-60
Year: Issue:  3
Journal: FAULT-BLOCK OIL AND GAS FIELD

Keyword:  疲劳钻柱交变弯曲应力Forman模型;
Abstract: 疲劳破坏是钻柱失效的主要形式,进行钻柱疲劳寿命预测可以为钻柱的使用和管理提供依据.建立了钻柱力学模型,对钻柱的受力进行了分析,尤其分析了交变弯曲应力,并用Forman模型预测了钻柱的疲劳寿命,使计算结果更加准确.还应用形状改变能判据对构件屈服区进行了渐进分析,扩展了线弹性断裂力学的应用范围.理论计算结果和现场统计数据的一致性证明了此模型的实用性.
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