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Analysis and Knowledge of Fatigue Behavior and Operating Life of Pumping Unit Tubing
Author(s): 
Pages: 66-67
Year: Issue:  5
Journal: OIL-GASFIELD SURFACE ENGINEERING

Keyword:  抽油机井油管应力应变疲劳断裂寿命;
Abstract: 揭示了抽油机井油管在交变载荷作用下,油管接头尾部第一啮合齿的齿根处的应力应变行为.在涉及油管及油管柱诸方面均符合API规范要求,并在正常工作情况下,该处发生屈服,处于弹塑性状态.在循环加载-卸载时,参加应变循环的主要为弹性应变,塑性应变幅趋近于零.相应的疲劳实验结果表明,油管的运行周次可达107以上,没有观察到萌生裂纹,可以认为具有无限寿命,这与其应力应变行为是相符合的.
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