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L-riser: Steel Dynamic Riser for Severe Vessel Motions

机译：L-riser：用于剧烈船舶运动的钢制动态立管

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The “L-riser” is a new steel production and export riserrnconcept for floating production vessels that avoids the highrncost, integrity problems and size limits of flexibles.rnIt consists of two initially straight, constant wall thickness,rnsteel pipe sections joined to form an “L”; the steeply inclinedrnupper section is terminated at the vessel, the lower section isrntangent to the seabed at a point below the upper termination.rnAn elastic anchor line is attached at the 90 degree corner andrnto an anchor on the seabed. The corner is a double planarrnstress joint of novel design incorporating a long radius bendrn(see Figure 1 and 2).rnThe ”L-riser” configuration allows for large vessel motionsrnin typical harsh environments. Motion components parallelrnwith the upper riser section will be transferred almostrnundamped to the corner, and set up transverse oscillations thatrnare damped out in the lower section. The 90 degree cornerrngives the upper steel pipe section dynamic flexibility. Thernanchor line maintains near constant tension in the lowerrnsection, minimising fatigue at the touchdown point. Inrnaddition, the flexibility of the lower pipe section allows largernstatic platform offsets.rnThis paper present the feasibility study of the ”L-riser”rndesigned as a 28” ID export riser (see table 2 for pipernproperties) in 850m and 1750m water depth, for semirnsubmersible production unit in the Norwegian ContinentalrnShelf (NCS) area. Installation, component design, static andrndynamic analysis and fatigue life estimates are covered.rnEstimated fatigue life of all parts of the system exceeds 250rnyears. Material was X65, weld class D. Installation mayrnrequire only one vessel. The main analysis tool is VisualrnOrcaflex, by Orcina Limited, UK, Ref.[4]. The analysis resultsrnindicate that the design is not close to any limits, and that thern“L-riser” is a feasible, robust and highly competitive riserrnsystem over a wide range of applications.rnEstimated cost for one installed 28”ID riser at 850m waterrndepth is 300MNOK. Cost for 1750m water depth isrn450MNOK.rnMajor deepwater offshore development areas like NCS, asrnWest Shetland, Canada, GOM and Brazil experiencernchallenging environmental conditions as discussed in thisrnpaper. Other areas like West Africa have other riser challengesrnlike temperature and insulation.
机译：“ L型冒口”是一种新的用于浮动生产船的钢铁生产和出口概念，它避免了高昂的成本，完整性问题和挠性件的尺寸限制。它由两个最初为直的，恒定的壁厚的钢管部分组成，以形成“ L”；陡峭的上段终止于船舶，下段在上终止点下方的点处与海床相切。弹性锚固线连接在90度角处，并固定至海底的锚固上。拐角是新颖设计的双平面应力接头，结合了长半径弯曲（见图1和2）。“ L形”配置允许在典型的恶劣环境下进行大型船舶运动。与上立管段平行的运动分量将几乎不加阻尼地传递到拐角处，并在下管段中消除横向振动。 90度角使上部钢管截面具有动态柔性。 Thernanchor线在下部保持接近恒定的张力，从而最大程度地降低了接地点的疲劳。此外，下部管段的柔韧性允许更大的静态平台偏移量。rn本文介绍了设计为28英寸ID出口立管的“ L型立管”的可行性研究（关于水管性能，请参见表2），适用于水深为850m和1750m的情况。挪威大陆架（NCS）地区的半潜式生产装置。涵盖了安装，组件设计，静态和动态分析以及疲劳寿命估算。系统所有部件的估算疲劳寿命超过250rnyears。材料是X65，焊接等级D。安装可能只需要一艘船。主要分析工具是英国Orcina Limited的VisualrnOrcaflex，参考文献[4]。分析结果表明，该设计没有接近任何限制，并且“ L形冒口”是一种可行，强大且具有高度竞争力的立管系统，适用于广泛的应用。rn在850m水深处安装一个28英寸ID立管的估算成本为300MNOK。 1750m水深的成本为450MNOK。rn如本文所述，主要的深海近海开发区（如NCS，西设得兰群岛，加拿大，GOM和巴西）经历了严峻的环境条件。西非等其他地区也面临其他挑战，例如温度和隔热问题。

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