深水悬链线式柔性立管参数敏感性分析

Parameter Sensitivity Analysis of Catenary Flexible Riser in Deep Water

针对柔性立管所处的深水环境,选取应用较为广泛的悬链线式布置方法,在特定的海洋环境中,在大型有限元软件OrcaFlex上建立悬链线立管模型进行动力分析。选取悬挂角、立管末端锚固点位置和管内流体等关键参数进行参数敏感性分析。结果表明:悬挂角的变化对立管顶部曲率有作用,但立管底部曲率和最大张力对悬挂角的变化不敏感;立管末端锚固点位置变化对立管动力响应有明显影响,布置立管时需重点考虑;立管曲率和弯矩对管内流体密度及流速的变化不敏感,但立管最大张力随管内流体密度的增大而减小,随管内流速的增大而增大。

For deep-water environment of flexible riser,the commonly used catenary configuration is selected. In the specific ocean surroundings,the model of catenary riser is built with finite element software OrcaFlex. Parameter sensitivity analysis is made with the variation of top angle,mooring point and flow inside riser. Results show： the variation of top angle can affect the curvature of a top riser,while curvature of touch down point and max tension are not sensitive to it; Riser mooring point has clear influence on dynamic response of riser,which needs additional considerations; the curvature and bend moment of the riser are not sensitive to the variation of density and velocity of flow inside riser,but maximum tension decreases with the increasing density and increases with increasing velocity.