Analysis of static configuration and internal force of ultra-deep water hybrid riser system
A hybrid riser system connected to FPSO is an important oil production method in ultra-deep water areas.In this study,the interaction of the hose,buoyancy can,and steel riser were considered to establish the finite element model of the whole system.The static displacement configuration and internal force of the hybrid riser system were calculated,and the distribution law of displacement,tension,and bending moment of the hybrid riser was revealed.The results show that when the hose reaches static equilibrium in still water,the in-plane offset is the largest,followed by the Z-direction offset.Influenced by gravity and buoyancy,the configuration of the hose is different from that in the air.The tension between the hose and the FPSO reaches its maximum,and the one between the hose and the float takes second place,while the bending moment has its extremum in the middle of the hose.The maximum tension of the hybrid riser system is at the junction between the riser and the buoyancy can,while the bending moment of the system is at the bottom of the riser.
ultra deep waterhybrid riser systemconfigurationtensionbending moment
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