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Fatigue evaluation of drill pipe by considering ship motions and its application in scientific drilling
Journal of Marine Science and Technology ( IF 2.6 ) Pub Date : 2020-08-05 , DOI: 10.1007/s00773-020-00752-3
Tomoya Inoue , Masahiko Fujikubo

The fatigue strength of a drill pipe is a critical factor governing the performance of drillings. Substantial research has been conducted related to fatigue evaluation and various factors that have an effect on fatigue. However, earlier studies have expressed concerns over the use of fatigue curves obtained from full scale tests and stress responses obtained via finite element analysis for evaluation: (a) fatigue curves were obtained by utilizing the stress measured at a point far away from the failure area rather than the stress exerted at the failure point, (b) the stress response is not equivalent to the stress expressing the fatigue curve. It is also important to obtain the stress-response amplitude by precisely considering the irregular wave and ship motion response. This study proposes a method to obtain stress and moment responses due to ship motion in irregular waves. Secondly, it proposes a method to obtain the fatigue curve from a full-scale fatigue test suitable for evaluating the cumulative fatigue with stress response and moment response results. Then, the cumulative fatigue is calculated by applying Miner’s rule. This paper also applies the proposed method to a scientific drilling program amid strong ocean currents and uses a special drill pipe. The results by the proposed method are compared with those obtained by previous methods.

中文翻译:

考虑船舶运动的钻杆疲劳评价及其在科学钻井中的应用

钻杆的疲劳强度是控制钻井性能的关键因素。已经对疲劳评估和影响疲劳的各种因素进行了大量研究。然而,早期的研究对使用从全尺寸试验获得的疲劳曲线和通过有限元分析获得的应力响应进行评估表示担忧:(a) 疲劳曲线是通过利用在远离失效区域的点测量的应力获得的(b) 应力响应不等同于表示疲劳曲线的应力,而不是施加在失效点的应力。通过精确考虑不规则波浪和船舶运动响应来获得应力响应幅值也很重要。本研究提出了一种方法来获得不规则波浪中船舶运动引起的应力和力矩响应。其次,它提出了一种从全尺寸疲劳试验中获得疲劳曲线的方法,该方法适用于用应力响应和力矩响应结果评估累积疲劳。然后,通过应用 Miner 规则计算累积疲劳。本文还将所提出的方法应用于强洋流中的科学钻探计划,并使用了特殊的钻杆。将所提出方法的结果与先前方法获得的结果进行比较。累积疲劳是通过应用 Miner 规则计算的。本文还将所提出的方法应用于强洋流中的科学钻探计划,并使用了特殊的钻杆。将所提出方法的结果与先前方法获得的结果进行比较。累积疲劳是通过应用 Miner 规则计算的。本文还将所提出的方法应用于强洋流中的科学钻探计划,并使用了特殊的钻杆。将所提出方法的结果与先前方法获得的结果进行比较。
更新日期:2020-08-05
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