Coupled dynamics between a turret-moored FPSO and a semi-submersible accommodation platform

Dong, Qing; Guo, Xiaoxian; Li, Xin; Lu, Wenyue; Yang, Jie

doi:10.1016/j.oceaneng.2021.108764

Cited by 2 publications

(2 citation statements)

References 29 publications

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“…In this work, the FPSO's motions are predicted in both the frequency domain and the time domain. The governing equation in the frequency domain can be written as follows [4,23]:…”

Section: Governing Equations Of Buoy Motionmentioning

confidence: 99%

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Dynamic Responses of the Cylindrical Floating Drilling Production Storage and Offloading System with Annular Anti-Motion Structures under the Survival Sea Scenario

Zhao

et al. 2023

JMSE

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At present, dry wellheads are usually adopted on small-storage TLP and SPAR platforms to develop offshore oil and gas because of the robust hydrodynamic performance under severe-wind seas. On the other hand, FPSO and FDPSO platforms that have a larger storage capacity can hardly use this cost-saving facility due to their relatively poor vertical motion performance. Cylindrical FPSOs are proposed to improve the heave performance of ship-type FPSOs, but their behaviors are still too large to adopt the dry wellheads. In the present work, a cylindrical FDPSO platform is proposed based on the FWPSO platform, adding an extension cylinder and a new damping structure at the bottom. Their hydrodynamic performances are calculated by the potential theory and compared in the frequency domain. Taking two particular mooring systems, including both catenary and ‘chain-polyester-chain’ types, and the survival sea scenario in the South China Sea into account, a time-domain coupling analysis was adopted to simulate the dynamic performance of the platform-mooring system. The feasibility of dry wellhead adoption on the FDPSO is discussed by investigating the platform motion and the mooring tension. The results show that the FCDS platform with the ‘chain-polyester-chain’-type mooring system can meet the motion response requirements, and the mooring system can also meet the requirements of the specification.

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“…In this work, the FPSO's motions are predicted in both the frequency domain and the time domain. The governing equation in the frequency domain can be written as follows [4,23]:…”

Section: Governing Equations Of Buoy Motionmentioning

confidence: 99%

“…To be specific, the beam wave will induce larger wave loads than the longitudinal wave. In order to reduce the resulting loading on the whole system, the single-point mooring (SPM) system is usually adopted [4]. Although safety is ensured, the SPM system is much more expensive than the multipoint mooring system.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Responses of the Cylindrical Floating Drilling Production Storage and Offloading System with Annular Anti-Motion Structures under the Survival Sea Scenario

Zhao

et al. 2023

JMSE

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Modeling and Analysis of Offshore Gangway under Dynamic Load

Qiu

Niu

et al. 2023

JMSE

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The safety transfer on the sea is threatened by wind, wave and surge loads. An offshore gangway ensures smooth and safe transfer by compensating the ship’s motion. In a mixed offshore gangway system, the transfer gangway is a huge asymmetric load on top of the stable platform, and the displacement of its center of gravity causes it to exert a large dynamic load on the stable platform. A dynamic model of the offshore gangway under dynamic load is established in this work. The Lagrange equation is used to establish the dynamic model of the transfer gangway; the equivalent center of gravity method is used to visualize its dynamic load. The dynamic of the stable platform is modeled by the virtual work principle. Finally, the accuracy of the mathematical model was verified by the joint simulation. Simulation results indicate that under the influence of dynamic load, the tractive force of the second drive support chain is 2–3 times greater than the tractive force of the first and third drive support chains. With the same excitation, the tractive force of the second drive support chain is 2.83 times higher than that under the static load.

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Coupled dynamics between a turret-moored FPSO and a semi-submersible accommodation platform

Cited by 2 publications

References 29 publications

Dynamic Responses of the Cylindrical Floating Drilling Production Storage and Offloading System with Annular Anti-Motion Structures under the Survival Sea Scenario

Dynamic Responses of the Cylindrical Floating Drilling Production Storage and Offloading System with Annular Anti-Motion Structures under the Survival Sea Scenario

Modeling and Analysis of Offshore Gangway under Dynamic Load

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