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首页> 外文会议>Innovation without limits / OTC .04 >The Effect of Tube Friction on the Fatigue Life of Steel Tube Umbilical Risers – New Approaches to Evaluating Fatigue Life using Enhanced Nonlinear Time Domain Methods
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The Effect of Tube Friction on the Fatigue Life of Steel Tube Umbilical Risers – New Approaches to Evaluating Fatigue Life using Enhanced Nonlinear Time Domain Methods

机译：管摩擦力对钢管竖管疲劳寿命的影响-使用增强的非线性时域方法评估疲劳寿命的新方法

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摘要

A critical component in the wet tree development of deeprnwater fields is the umbilical riser. Failure of the umbilical canrnresult in partial or total loss of production, with resultingrnsevere economic consequences. In many recent deep waterrnprojects, steel tubes for control and injection lines havernbecome the preferred solution over traditional thermoplasticrnhose based designs. The fatigue design of these steel tubernumbilicals (STUs) with accurate modeling of the steel tuberninteraction friction stresses is critical for any developmentrnusing STUs.rnSimplified conservative approaches where the nonlinearitiesrnof the tube friction are ignored have frequently beenrnused for STU fatigue design. This paper presents therntheoretical basis for an enhanced non-linear time domainrnfatigue model for deepwater STUs. In developing this model,rnthe authors have proposed an analytical fatigue designrnapproach that accounts for the non-linearity of tube frictionrnusing slip theory combined with time-domain global and localrnanalytical methods.rnA worked example is presented, where an ExxonMobilrnWest of Africa field development STU has been analyzedrnusing both the enhanced nonlinear time domain fatigue modelrnand an alternative simplified model. The enhanced non-linearrntime domain fatigue model, has been used to evaluate therninfluence on fatigue life of several parameters, includingrnfriction, water depth and STU cross-section geometry, some ofrnwhich become increasingly important in deeper water.rnThe merits of the enhanced nonlinear fatigue model overrnthe simplified model are critically evaluated, as are the lessonsrnlearned on the importance of critical design parameters andrnanalysis assumptions affecting STU fatigue life. Conclusionsrnare also presented on the benefit of further enhancement of thernanalytical approaches commonly used to design forrnumbilical fatigue.
机译：脐带立管是深水田湿地树木开发中的关键组成部分。脐带导管的衰竭导致部分或全部生产损失，从而导致严重的经济后果。在许多最新的深水项目中，用于控制和注入管线的钢管已成为优于传统基于热塑性软管的设计的首选解决方案。这些钢管轮胎（STU）的疲劳设计以及对钢管相互作用摩擦应力的精确建模对于使用STU进行的任何开发都是至关重要的。简化的保守方法经常忽略钢管摩擦的非线性，因此经常被用于STU疲劳设计。本文为深水STU提供了一种改进的非线性时域疲劳模型的理论基础。在开发此模型时，作者提出了一种分析疲劳设计方法，该方法考虑了管摩擦的非线性，使用滑移理论结合时域全局和局部分析方法。给出了一个工作示例，其中埃克森美孚非洲西部油田开发STU使用增强的非线性时域疲劳模型和替代的简化模型进行了分析。增强的非线性时域疲劳模型已用于评估摩擦，水深和STU截面几何形状等多个参数对疲劳寿命的影响，其中一些参数在深水中变得越来越重要。增强非线性疲劳模型的优点对简化模型进行了严格评估，并从中获得了关于关键设计参数的重要性以及影响STU疲劳寿命的分析假设的经验教训。结论还提出了进一步增强通常用于设计脐带疲劳的热分析方法的好处。

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