Damping performance of annular anti-motion structures on a cylindrical floating drilling production storage and offloading system

Ji, Xinjie; Li, Yan; Tang, Yougang; Zhu, Qiang; Hu, Zhiqiang

doi:10.1016/j.oceaneng.2019.106590

Cited by 6 publications

(5 citation statements)

References 31 publications

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“…On the other hand, we will adopt the QTF approach to fully investigate the different frequency term of the second-order wave load and especially study its influence on the mooring tension as well as the horizontal motion. Another potential issue is that the quadratic damping performance is also another observation in our previous study based on the CFD model [20] and other publications based on the model tests [36]. It can be derived that this nonlinear term can more significantly improve the hydrodynamic performance of the FCDS.…”

Section: Conclusion and Discussionmentioning

confidence: 81%

“…We validated the damping performances of the anti-motion structures in previous publications [9,20]. However, in those works, due to the limitations of the CFD-based model in Fluent, only free-decay tests and force-oscillation tests were finished, and the viscous damping term and the vortex shedding performance were only discussed.…”

Section: Resultsmentioning

confidence: 93%

“…Particularly, the external edge is added on the corner of the AMS (which can be more clearly observed in the hydrodynamic panel model in Figure 4a). Based on our previous work [20], it showed that this design can significantly improve both heave and pitch damping so that the buoy oscillations could be reduced under extreme sea states, especially when the wave period approaches the natural period of the buoy's motion. In the following sections, the FWPSO and FCDS are chosen to perform the hydrodynamic simulations in both the frequency and time domain.…”

Section: Physical Model Descriptionmentioning

confidence: 99%

“…According to CFD-based simulations and model tests, the damping and natural periods of heave and pitch were investigated. Particularly, the influence of different anti-motion structures on its hydrodynamic performance was further studied [20]. In those CFD-based works, we conducted free-decay tests and forced-oscillation simulations on both the heave and pitch motions.…”

Section: Introductionmentioning

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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Section: Conclusion and Discussionmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 93%

Section: Physical Model Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…Several review studies on marine cylindrical floaters have been performed, such as cylindrical floating breakwater system [7], oil and gas platforms and renewable energy devices including wave energy converter and wind turbine foundations [8]. Cylindrical Floating Production Storage and Offloading system (FPSO) has been used in offshore oil and gas industry since the first appearance of this design, Sevan Piranema, which was constructed by Sevan Marine Company in 2006 [9]. Due to their cylindrical shapes, cylindrical FPSO often experiences significant heave and pitch motions.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the motion response of a novel floating desalination plant for Egypt

et al. 2020

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Increasing water demand in remote coastal areas in Egypt has shifted attention to the role of floating desalination plants to alleviate water shortages. A novel mobile floating desalination plant is proposed for Ras Ghareb city in Egypt. The compatibility between floater natural periods and the energy excitation range of waves in deployment area can lead to resonance responses. Therefore, understanding the motions behaviour among waves of such floaters at a particular location is important for its safety, performance and operation. The goal of the present study is to investigate the suitability of proposed concept for Egyptian environment conditions by characterising the behaviour of the plant motion responses during its entire deployment conditions. Based on full scale design of the proposed plant, experimental study over a range of wave heights and frequencies was performed in the present study using a 1:100 scale model test. In order to identify the plant natural frequency and damping ratio, free decay and swinging tests were performed for different load conditions. Different wave heights were tested during the experiments in order to investigate the effect of wave height on the heave and pitch responses at plant natural frequencies. The experimental test results were compared with numerical results from frequency domain program HydroD implemented in Sesam DNV GL software package. Results show that heave and pitch motion responses give the closest agreement between the measurements and numerical predictions over the whole range of wave periods except the peak spike. The proposed cylindrical FDP is compared against a conventional ship FPSO concept widely used for offshore freshwater production and it was concluded that new cylindrical FDP shows better motion responses compared to conventional ship FPSO concept in same wave bands in Egypt.

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Comparative assessment of liquid sloshing in dry and wet storage tank of floating offshore platform

Liu

Cai

2023

Marine Structures

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Damping performance of annular anti-motion structures on a cylindrical floating drilling production storage and offloading system

Cited by 6 publications

References 31 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

Experimental investigation on the motion response of a novel floating desalination plant for Egypt

Comparative assessment of liquid sloshing in dry and wet storage tank of floating offshore platform

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