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Mathematical model of steel lazy-wave riser abandonment and recovery in deepwater |
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| Institution: | 1. Department of Mechanics and Engineering Science, Fudan University, Shanghai, China;2. Offshore Oil & Gas Research Center, China University of Petroleum, Beijing, China;1. State Key Lab of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, China;2. Vessel Performance Product, ABS Corporate APM, Huston, USA;1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. School of Marine Science and Technology, Newcastle University, NE1 7RU, England, UK;1. Department of Civil and Structural Engineering, Kyushu University, Japan;2. Department of Marine Systems Engineering, Kyushu University, Japan;1. Department of Naval Architecture and Ocean Engineering, Zhejiang Ocean University, Zhoushan, Zhejiang, China;2. Shandong Key Laboratory of Ocean Engineering, Ocean University of China, Qingdao 266100, China;3. Ocean Engineering Program, COPPE, Federal University of Rio de Janeiro, 21945-970, Brazil;4. Offshore Oil, Gas Research Center, China University of Petroleum, Beijing 102249, China |
| Abstract: | To meet the increasing applications of the deepwater steel lazy-wave riser (SLWR), the riser abandonment and recovery (A&R) is a great challenge for SLWR installation and its mechanical analysis is necessary and significant. This paper is focused on the abandonment and recovery process which is of great importance to the installation feasibility and analysis. A comprehensive mechanical model based on the nonlinear large deformation beam theory for simulating the deepwater SLWR is proposed. And a simple and suitable model for analyzing the A&R cable is developed. The presented model with detailed boundary conditions is able to deal with three different A&R methods. Numerical analysis is conducted by the finite difference method to investigate the riser configurations and somev important mechanical parameters of the pipeline and cable which exert influences on the riser's performance and the A&R cable's requirement. Parametric comparison study is conducted to analyze the advantage of different method. The proposed model can help on development of deepwater SLWR A&R design and analysis. |
| Keywords: | Steel lazy-wave riser (SLWR) Installation Abandonment and recovery Touchdown point (TDP) Nonlinear large deformation beam theory |
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