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Dynamic analysis of the subsea production system with lazy-wave risers attached to FPSO

Author

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  • Dapeng Zhang
  • Bowen Zhao
  • Keqiang Zhu
  • Haoyu Jiang

Abstract

The lazy-wave riser is an input and output riser for a flexible development system, which is widely used in all the riser and pipeline systems. Because of the influence of various factors, its configuration description, control and motion which have a strong nonlinear character are complex during the running process of the lazy-wave riser. Reference to the specific structure and environmental parameters of a certain lazy-wave risers system with a 300 thousand tons FPSO, with the basis of the specific process of the flexible riser system at work, the lazy-wave risers were discretized into lumped mass models, combined with AQWA, the simplified dynamic model of the whole system at the depth of 2100m has been established by the large hydrodynamic analysis software OrcaFlex. The dynamic response characteristics of the lazy-wave risers have been given by using time domain coupling method. With and without the consideration of the 2nd wave drift load in the simulation process, the effects of the 2nd wave drift load on the results are obtained. The simulation results reveal the difficulty of simulation convergence caused by a large number of risers and flexible components. The 2nd order wave drift loads have a significant effect on the riser system, resulting in the increasement of the effective tension at each end of each riser. To counteract the magnitude of the FPSO response caused by such loads, the number of mooring lines needed to be increased or combined with dynamic positioning techniques to optimize the design.

Suggested Citation

  • Dapeng Zhang & Bowen Zhao & Keqiang Zhu & Haoyu Jiang, 2023. "Dynamic analysis of the subsea production system with lazy-wave risers attached to FPSO," PLOS ONE, Public Library of Science, vol. 18(9), pages 1-26, September.
    • Handle: RePEc:plo:pone00:0291603
    DOI: 10.1371/journal.pone.0291603
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    References listed on IDEAS

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    1. Chiemela Victor Amaechi & Grant Hosie & Ahmed Reda, 2022. "Review on Subsea Pipeline Integrity Management: An Operator’s Perspective," Energies, MDPI, vol. 16(1), pages 1-12, December.
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    Cited by:

    1. Chiemela Victor Amaechi & Harrison Obed Butler & Salmia Binti Beddu & Agusril Syamsir & Idris Ahmed Ja’e & Ahmed Reda & Xuanze Ju, 2024. "Parametric analysis on the global design of flexible riser under different environmental conditions using OrcaFlex," PLOS ONE, Public Library of Science, vol. 19(12), pages 1-23, December.

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