Marine riser emergency disconnection analysis using scalar elements for tensioner modelling |
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| Institution: | 1. Petrobras – CENPES – R&D Center, Brazil;2. Federal University of Rio de Janeiro UFRJ – COPPE – PEC, Brazil;1. Department of Control Engineering, Faculty of Electrical and Computer Engineering, University of Tabriz, P.O. Box: 5166753389, Tabriz, Iran;2. Department of Electrical Engineering, Faculty of Electrical and Computer Engineering, University of Sistan and Baluchestan, Zahedan, Iran;1. Department of Naval Architecture and Ocean Engineering, Seoul National University, Seoul 151-744, Republic of Korea;2. Department of Naval Architecture and Ocean Engineering, and Research Institute of Marine Systems Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Republic of Korea;3. Research Institute of Marine Systems Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Republic of Korea;1. CNOOC Research Institute Ltd, Beijing, China;2. Centre for Offshore Engineering and Safety Technology, China University of Petroleum (East China), Qingdao, China;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiaotong University, Shanghai 200240, China;3. Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;1. Division of Ocean Science and Technology, Shenzhen Graduate School, Tsinghua University, 518055, Shenzhen, China;2. School of Engineering, Cardiff University, Cardiff CF24 3AA, Wales, UK |
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| Abstract: | This work proposes nonlinear parallel spring-damper scalar elements in series with a rigid beam element to represent drilling riser tensioner behavior during an emergency disconnection scenario in global riser analysis. The software package used was Orcaflex. This is a simpler approach than the more complex, full hydraulic-pneumatic-mechanic dynamic simulation modelling of the tensioning system, commonly used in literature, which can be time consuming and numerically more sensitive. The model can also be used to represent top tension variation in global riser analysis, allowing for more complex and precise simulations, especially for fatigue life and overpull estimations. The results show adequate agreement with the researched bibliography. |
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| Keywords: | Marine riser Riser tensioner Emergency disconnection Riser analysis Orcaflex |
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