基于FPSO运动的多波型立管响应对比分析
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1.海洋石油工程股份有限公司;2.天津大学;3.海洋石油工程有限公司

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国家自然科学基金面上项目(51879189);国家重点研发计划(2018YFC0310502);广西科技重大专项(桂科AA17292007);工信部项目(G18473CJ09)


Comparative Analysis of Multi-Wave SCR Response Based on FPSO Motion
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1.Offshore Oil Engineering Co., Ltd.;2.TianJin University;3.Offshore Oil Engineering Co., Ltd

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    摘要:

    缓波型立管运用浮力段能有效隔离悬挂点与触地区的动力响应,减少上部浮体运动导致的管道触地区动态屈曲等的负面影响。本文基于最小势能原理建立立管的非线性力学模型,应用海洋工程分析软件OrcaFlex进行数值模拟,通过控制变量法分散浮筒的布置位置,建立单波、双波及三波构型立管。考虑FPSO六个自由度响应,对比三种构型立管垂向运动及整体von Mises应力分布,通过比较触地点动态位移判断出具有最优运动隔离效果的立管构型。结果表明:考虑浮体响应后浮筒的分散布置有利于立管垂向速度及加速度的平稳过渡;三种构型中双波构型对重点位置的张力优化效果最佳、抵抗材料发生屈曲变形的能力最强且该构型隔离浮体运动响应的效果最优。

    Abstract:

    The buoyancy section of the LwSCR can effectively isolate the dynamic response of the hang-off point and TDP, and reduce the negative effects such as dynamic buckling of TDZ caused by the movement of FPSO. In this paper, a nonlinear mechanical model of the riser is established based on the principle of minimum potential energy, and the marine engineering analysis software OrcaFlex is used for numerical simulation. The position of the buoys is dispersed by the control variable method, and single-wave, double-wave and three-wave risers are established. Without considering the response of FPSO, the optimization effects of the mechanical characteristics of the three wave-type risers at the hot spots (hang-off point, TDP) are compared and analyzed. Considering the response of FPSO six degrees of freedom, comparing the vertical motion of the three configurations of riser and the overall von Mises stress distribution, the riser configuration with the best motion isolation effect is determined by comparing the dynamic displacement of the TDP. The results show that the dispersed arrangement of the buoys after considering the response of FPSO is conducive to the smooth transition of the vertical velocity and acceleration of the riser. Of the three configurations, the double-wave configuration has the best effect on optimizing the tension at the hot spot and has the ability to resist buckling deformation of the material. The strongest and this configuration has the best effect on isolating the motion response of FPSO.

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  • 收稿日期:2021-04-01
  • 最后修改日期:2021-05-12
  • 录用日期:2021-05-12
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