A Coupled, Global/Local Finite Element Methodology to Evaluate the Fatigue Life of Flexible Risers Attached to Floating Platforms for Deepwater Offshore Oil Production

Monique de Carvalho Alves, Fabrício Nogueira Corrêa, José Renato Mendes de Sousa () and Breno Pinheiro Jacob
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Monique de Carvalho Alves: LAMCSO—Laboratory of Computer Methods and Offshore Systems, Civil Engineering Department, COPPE/UFRJ—Post Graduate Institute of the Federal University of Rio de Janeiro, Avenida Pedro Calmon, S/N, Cidade Universitária, Ilha do Fundão, Rio de Janeiro 21941-596, RJ, Brazil
Fabrício Nogueira Corrêa: LAMCSO—Laboratory of Computer Methods and Offshore Systems, Civil Engineering Department, COPPE/UFRJ—Post Graduate Institute of the Federal University of Rio de Janeiro, Avenida Pedro Calmon, S/N, Cidade Universitária, Ilha do Fundão, Rio de Janeiro 21941-596, RJ, Brazil
José Renato Mendes de Sousa: LACEO—Laboratory of Analysis and Reliability of Offshore Structures, Civil Engineering Department, COPPE/UFRJ—Post Graduate Institute of the Federal University of Rio de Janeiro, Avenida Pedro Calmon, S/N, Cidade Universitária, Ilha do Fundão, Rio de Janeiro 21941-596, RJ, Brazil
Breno Pinheiro Jacob: LAMCSO—Laboratory of Computer Methods and Offshore Systems, Civil Engineering Department, COPPE/UFRJ—Post Graduate Institute of the Federal University of Rio de Janeiro, Avenida Pedro Calmon, S/N, Cidade Universitária, Ilha do Fundão, Rio de Janeiro 21941-596, RJ, Brazil

Mathematics, 2024, vol. 12, issue 8, 1-29

Abstract: This study introduces a Finite Element (FE) hybrid methodology for analyzing deepwater offshore oil and gas floating production systems. In these systems, flexible risers convey the production and are connected to a balcony on one side of the platform. The proposed methodology couples, in a cost-effective manner, the hydrodynamic model of the platform with the FE model that represents the risers and the mooring lines, considering all nonlinear dynamic interactions. The results obtained and the associated computational performance are then compared with those from traditional uncoupled analyses, which may present inaccurate results for deepwater scenarios, and from fully coupled analyses that may demand high computational costs. Moreover, particular attention is dedicated to integrating global and local stress analyses to calculate the fatigue resistance of the flexible riser. The results demonstrate that the coupled global analyses adequately capture the asymmetric behavior due to all risers being connected to one of the sides of the platform, thus resulting in a more accurate distribution of fatigue damage when compared to the uncoupled methodology. Also, fatigue life is significantly affected by adequately considering the coupling effects.

Keywords: oil and gas; floating platforms; flexible risers; coupling effects; fatigue (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2024
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