墨西哥湾胡佛DDCV用隔水管的寿命延长

Chen Yu, Yongming Cheng, Guangqiang Yang, Manuel R. Carballo
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摘要

本文根据最新技术和监测数据,研究了墨西哥湾胡佛DDCV(经典Spar)立管的寿命延长问题。墨西哥湾(GoM)的深水开发始于大约20年前。现在是时候评估立管系统的整体完整性,并以结构化和系统化的方式探索延长立管寿命的可能性。自2000年安装以来,一艘深水沉箱船(DDCV)在过去的17年里一直保持着它的服务水平。该技术有望将立管设计寿命延长10年以上。本文展示了从最初的规划,原始设计文件的审查,收集和分析生产和海上测量数据,最后到海上集中水下检查的延长寿命验证过程。介绍了用于DDCV的钢制悬链线立管(scr)和顶部张拉立管(trs)的完整性评估方法。通过利用最新的环境数据、建成信息、测量的VIM运动数据和最新的分析工具,独立分析了整体性能。计算了隔水管的整体性能,包括动强度和疲劳,并考虑了波动疲劳、VIM和VIV的贡献。因数立管疲劳寿命具有原有的安全系数,可满足10年以上的预期使用寿命。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Life Extension of the Risers Used for the Hoover DDCV in Gulf of Mexico
This paper investigates life extension of the risers used for the Hoover DDCV (a classical Spar) in GoM, based on the latest technology and monitored data. Deepwater development in Gulf of Mexico (GoM) started about two decades ago. It is the time to evaluate the global integrity of the riser systems and explore the possibility of life extension in a structured and systematic way. A Deep Draft Caisson Vessel (DDCV), has been keeping up its class services for the past 17 years since it was installed in 2000. It was expected to extend the riser design life by 10 more years. This paper showed the life extension verification process starting from the initial planning, reviewing of the original design document, gathering and analyzing production and offshore measured data and finally to offshore focused underwater inspection. It introduces the methodology to assess the integrity of Steel Catenary Risers (SCRs) and Top Tensioned Risers (TTRs) used for the DDCV. An independent global performance was analyzed by utilizing latest environmental data, as-built information, measured VIM motion data and the latest analytical tools. It computes the riser global performance including dynamic strength and fatigue with the contributions from wave fatigue, VIM and VIV. The factored riser fatigue life is provided with the original safety factors to meet the intended 10 more years of service life.
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