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Large-Scale Experiments of a Marine Riser

机译：海上提升机的大规模实验

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The focus of this research is on the development and testing of a large-scale model riser (130 m in length) undergoing high mode vortex induced vibrations (VTV) in the ocean environment. This large scale model will provide an intermediate step between the common riser models (8-10 m in length) that have mainly been used to research VIV to date and the actual 3,000+ m deepwater risers being used in industry today. During offshore drilling operations, marine risers carry mud and debris from below the sea floor, and during production operations they are responsible for transporting oil or gas from the hydrocarbon reservoir to the surface platform. The integrity of a marine riser is therefore critical to the success of offshore drilling and production. The flow of seawater around marine risers is subject to vortex shedding which excites oscillations known as Vortex Induced Vibrations (VIV). When the VTV frequency approaches one of the natural frequencies of the structure, resonance, or lock-in occurs. This results in enhancement of the vibration amplitude of the structure and may have potentially destructive consequences due to high bending stresses and fatigue damage of the riser. At present, the prediction of this phenomenon is one of the most challenging areas in the offshore industry. In experimental investigations of VTV, large aspect ratio risers, namely long cylinders with relatively small diameters, pose a modeling challenge. This paper focuses on the development, field testing and data analysis of a large-scale model riser capable of transmitting data in real-time under realistic operating conditions. The large scale riser was mounted to the port side of a small vessel and towed off the east coast of Newfoundland through a series of vessel velocities corresponding to realistic operating conditions for deep-water risers. This paper includes an analysis of the modal vibrations experienced by the riser as well as the in-line and cross stream motions, over a series of vessel speeds.
机译：该研究的重点是开发和测试在海洋环境中经历高模式涡旋诱导振动（VTV）的大型模型提升板（长度为130米）。这种大规模模型将在迄今为止主要用于研究VIV的共同提升机型（长度为8-10米）之间的中间步骤，并且当今行业使用的3,000多个深水立管。在海上钻井业务期间，海程立管从海底下面携带泥土和碎屑，在生产作业中，他们负责将石油或气体从碳氢化合物储存器运送到地表平台。因此，海洋提升板的完整性对海上钻井和生产的成功至关重要。海水管周围的海水流量受到涡旋脱落，其激发称为涡旋诱导振动（VIV）的振荡。当VTV频率接近结构，共振或锁定的自然频率之一时。这导致增强结构的振动幅度，并且由于高弯曲应力和提升管的疲劳损坏，可能具有潜在的破坏性后果。目前，这种现象的预测是海上行业中最具挑战性的地区之一。在VTV的实验研究中，大的纵横比立管，即具有相对较小的直径的长圆柱，构成建模挑战。本文重点介绍了一种能够在实际操作条件下实时传输数据的大型模型立管的开发，现场测试和数据分析。大型立管安装在小船只的港口侧，并通过对应于深水立管的现实操作条件，通过一系列血管速度从纽芬兰东海岸拖走。本文包括分析提升管经历的模态振动以及在一系列血管速度上进行的线和交叉流动运动。

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