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Efficient methods to mitigate SCR-induced walking of short subsea flowlines
Marine Structures ( IF 3.9 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.marstruc.2020.102891 I. Seyfipour , M.R. Bahaari , R. Mirghaderi
Marine Structures ( IF 3.9 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.marstruc.2020.102891 I. Seyfipour , M.R. Bahaari , R. Mirghaderi
Abstract Steel catenary riser is a long-established option for subsea projects in deep-water regions. Sustained pulling force of steel catenary risers on subsea flowlines in combination with cyclic thermal load throughout the system lifetime may lead to progressive global axial displacement of subsea pipelines which has been termed as ‘walking’. One of the challenges in the deep-water industry is long-term walking of subsea flowlines in a cumulative manner. Common practice methods for walking mitigation are quite expensive operations. State-of-the-art mitigation strategies are proposed in the paper by means of modifying pipe pieces before the installation operation. Bowed pipe pieces and miter joints are two recommended approaches for walking mitigation. The presented mitigation strategies are relatively cost-effective solutions for the pipe-walking challenge and they are able to considerably cease the potential cyclic walking. Comprehensive FE analyses in ABAQUS software are performed to evaluate the proposed deformed pipelines response subject to two loading conditions. Through-life integrity of the suggested pre-deformed pipeline is assessed in terms of effective axial force, local buckles and excessive axial strains. A comparison of the presented method with conventional techniques shows the effectiveness of the proposed configuration. The proposed methods can significantly reduce effective axial force throughout the subsea pipeline by means of artificially introduced deformations. The cumulative walking of the presented method is practically zero. In addition, the influence of combined triggering mechanisms to the walking phenomenon is assessed when the pipeline is located on a sloping seabed and it is subject to non-uniform thermal loads. A parametric study is performed to improve confidence in design and provide a reasonably practical technique with an optimal shape.
中文翻译:
减轻 SCR 引起的短海底出油管行走的有效方法
摘要 钢悬链线立管是深水区海底项目的长期选择。海底出油管线上钢悬链线立管的持续拉力与整个系统生命周期内的循环热载荷相结合,可能导致海底管道逐渐发生全球轴向位移,这被称为“行走”。深水行业面临的挑战之一是以累积方式长期行走海底出油管。步行缓解的常见实践方法是非常昂贵的操作。论文中提出了最先进的缓解策略,方法是在安装操作之前修改管件。弯曲的管件和斜接接头是两种推荐的步行缓解方法。所提出的缓解策略是针对管道行走挑战的相对具有成本效益的解决方案,并且它们能够大大停止潜在的循环行走。在 ABAQUS 软件中进行全面的有限元分析,以评估受两种载荷条件影响的变形管道响应。根据有效轴向力、局部屈曲和过度轴向应变来评估建议的预变形管道的终生完整性。所提出的方法与传统技术的比较显示了所提出的配置的有效性。所提出的方法可以通过人为引入的变形显着降低整个海底管道的有效轴向力。所提出方法的累积步行实际上为零。此外,当管道位于倾斜的海床上并且受到非均匀热载荷时,评估了组合触发机制对行走现象的影响。进行参数研究以提高设计信心并提供具有最佳形状的合理实用的技术。
更新日期:2021-03-01
中文翻译:
减轻 SCR 引起的短海底出油管行走的有效方法
摘要 钢悬链线立管是深水区海底项目的长期选择。海底出油管线上钢悬链线立管的持续拉力与整个系统生命周期内的循环热载荷相结合,可能导致海底管道逐渐发生全球轴向位移,这被称为“行走”。深水行业面临的挑战之一是以累积方式长期行走海底出油管。步行缓解的常见实践方法是非常昂贵的操作。论文中提出了最先进的缓解策略,方法是在安装操作之前修改管件。弯曲的管件和斜接接头是两种推荐的步行缓解方法。所提出的缓解策略是针对管道行走挑战的相对具有成本效益的解决方案,并且它们能够大大停止潜在的循环行走。在 ABAQUS 软件中进行全面的有限元分析,以评估受两种载荷条件影响的变形管道响应。根据有效轴向力、局部屈曲和过度轴向应变来评估建议的预变形管道的终生完整性。所提出的方法与传统技术的比较显示了所提出的配置的有效性。所提出的方法可以通过人为引入的变形显着降低整个海底管道的有效轴向力。所提出方法的累积步行实际上为零。此外,当管道位于倾斜的海床上并且受到非均匀热载荷时,评估了组合触发机制对行走现象的影响。进行参数研究以提高设计信心并提供具有最佳形状的合理实用的技术。