Abstract
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.
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Funding
This research was financially supported by the National Natural Science Foundation of China (Grant No. 52271299), and the Science Foundation of China University of Petroleum, Beijing (Grant No. 2462020YXZZ046).
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Gu, Jj., Huang, J., Gao, L. et al. Abandonment and Recovery Operation of Steel Lazy-Wave Riser in Deep-water by Controlled Vessel and Cable Velocity Rate. China Ocean Eng 37, 29–41 (2023). https://doi.org/10.1007/s13344-023-0003-9
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DOI: https://doi.org/10.1007/s13344-023-0003-9