Alternative Tensioning System for Spar Top Tensioned Risers

机译：翼梁顶部张紧式立管的替代张紧系统

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This paper introduces an alternative tensioning system for Spar top tensioned risers. This novelrnscheme of attaching risers to the Spar hull provides an alternative to the use of buoyancy cans,rntraditionally used for tensioning the risers. In scheme presented within, all the risers arernsupported on a common table type structure. The table structure is supported on several motionrncompensators at the top of the Spar hull. The motion compensators are designed to provide therndesired vertical and rotational stiffness to the riser-table system that is required to reduce the Sparrnmotion induced tensions in the risers.rnThe proposed system is believed, for some situations, to be a lower cost alternative to thernpresently used buoyancy cans. The new system also has short stroke and thus requires lessrnvertical space for the trees and a reduced requirement for the flexible jumpers. Riser interferencernconcerns are reduced due to limited stroke of the risers. The riser keel joints are also simplifiedrndue to the reduced stroke. All of the mechanical items are above the water surface simplifyingrnmaintenance and repair. Installation of the riser motion compensation system should be simplerrnthan those required for the present buoyancy can system. The new system has several otherrnpossible advantages such as no special drilling and workover tensioning requirements, andrnreduced pitch response of the Spar.rnThe paper will present an overview of the new concept and discuss advantages and disadvantagesrnof the system compared to existing tensioning systems. Details of the motion compensators andrnother components will also be presented. The proposed system integrates the risers to the Sparrnand thus is a truly coupled system. The response of Spar, risers and motion compensators has tornbe predicted together, since they have influence on each other. Results of global performancernanalysis will be presented focusing on the effect of coupling of risers and motion compensatorsrnon the Spar response. Riser strength, fatigue and interference response will also be presented.

机译：本文介绍了一种用于Spar顶部张紧立管的替代张紧系统。这种将立管连接到Spar船体的新颖方案为浮力罐的使用提供了一种替代方法，该罐通常用于张紧立管。在本文提出的方案中，所有立管都支撑在一个公用的桌子类型结构上。该表结构在Spar船体顶部的多个运动补偿器上得到支持。运动补偿器旨在为提升板系统提供所需的垂直和旋转刚度，以减少Sparrnmotion引起的提升板中的张力。在某些情况下，所建议的系统被认为是目前使用的低成本替代方案浮力罐。新系统还具有较短的行程，因此需要树木的垂直空间更少，并且对柔性跳线的需求减少。由于竖板的行程有限，因此减少了竖板干扰。由于减少了冲程，立管龙骨接头也得到了简化。所有机械项目都在水面以上，从而简化了维护和维修。立管运动补偿系统的安装应比当前浮力罐系统所需的安装简单。新系统还具有其他一些可能的优点，例如没有特殊的钻孔和修井张紧要求，并且减少了Spar的俯仰响应。本文将对新概念进行概述，并讨论与现有张紧系统相比该系统的优点和缺点。还将介绍运动补偿器和其他组件的详细信息。所提出的系统将立管集成到Sparrnand，因此是一个真正的耦合系统。一起预测了晶石，立管和运动补偿器的响应，因为它们相互影响。将介绍整体性能分析的结果，重点是提升板和运动补偿器的耦合效应，而不是Spar响应。立管强度，疲劳和干扰响应也将介绍。

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来源
《Pathways to ultra deepwater opportunities》|2001年|p.1-16|共16页
会议地点 Rio de Janeiro(BR);Rio de Janeiro(BR)
作者
Lyle Finn; Himanshu Gupta; Joe Gebara; Steve Perryman; Mike Stambouzos;
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作者单位

CSO Aker Engineering Inc., USA;

rnCSO Aker Engineering Inc., USA;

rnCSO Aker Engineering Inc., USA;

rnBP America Inc., USA;

rnBHP Petroleum Inc., USA;

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原文格式 PDF
正文语种 eng
中图分类深海工程、近海工程;
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Alternative Tensioning System for Spar Top Tensioned Risers

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