Abandonment and Recovery Operation of Steel Lazy-Wave Riser in Deep-water by Controlled Vessel and Cable Velocity Rate

Evaluation of abandonment and recovery operation of steel lazy-wave riser in deepwater is presented in this paper. The calculation procedure includes two single continuous SLWR and cable segments, which are coupled together to form the overall mathematical model. Then the equilibrium equations of SL...

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Bibliographic Details
Published in:China ocean engineering 2023-02, Vol.37 (1), p.29-41
Main Authors: Gu, Ji-jun, Huang, Jun, Gao, Lei, Chen, Lei-lei, Jia, Ji-chuan, Wang, Shu-jiang
Format: Article
Language:English
Subjects:
Abandonment
Aquatic reptiles
Coastal Sciences
Deep water
Engineering
Equilibrium equations
Finite difference method
Fluid- and Aerodynamics
Iterative methods
Marine & Freshwater Sciences
Mathematical models
Methods
Numerical and Computational Physics
Ocean floor
Oceanography
Offshore Engineering
Original Paper
Potential energy
Recovery
Simulation
Steel
Steel structures
Velocity
Vessels
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Summary:Evaluation of abandonment and recovery operation of steel lazy-wave riser in deepwater is presented in this paper. The calculation procedure includes two single continuous SLWR and cable segments, which are coupled together to form the overall mathematical model. Then the equilibrium equations of SLWR and cable are established based on minimum total potential energy principle. The coupled equations are discretized by the finite difference method and solved by Newton-Raphson technique in an iterative manner. The present method is validated by well-established commercial code OrcaFlex. Recovery methods by considering different ratios of vessel’s moving velocity to cable’s recovery velocity are evaluated to optimize the abandonment and recovery operation. In order to keep the tension more stable during the recovery process, the rate ratio before leaving the seabed is increased, and the rate ratio after leaving the seabed is reduced.
ISSN:0890-5487
2191-8945
DOI:10.1007/s13344-023-0003-9