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On the Influence From Hydrodynamic Forces on Speed and Footprint for a Falling Riser

[+] Author Affiliations
Vidar Berntsen, Elizabeth Passano

Marintek, Trondheim, Norway

Carl M. Larsen

Norwegian Institute of Science and Technology, Trondheim, Norway

Nilo De Moura Jorge, José Roberto

Petrobras, Rio de Janeiro, RJ, Brazil

Paper No. OMAE2004-51405, pp. 709-715; 7 pages
doi:10.1115/OMAE2004-51405
From:
  • ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering
  • 23rd International Conference on Offshore Mechanics and Arctic Engineering, Volume 1, Parts A and B
  • Vancouver, British Columbia, Canada, June 20–25, 2004
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-3743-2 | eISBN: 0-7918-3738-6
  • Copyright © 2004 by ASME

abstract

This paper presents analysis method and key results from dynamic simulations of a drilling riser on 1900 metres water depth after release of upper end. Key results are the geometry of the collapsed riser on the seafloor (footprint) and the impact speed of the riser when hitting the seafloor. The purpose of the study has been to investigate the influence on the results from operational and model parameters such as vessel offset relative to the riser base, current speed, hydrodynamic load model, material model and interaction between the riser and the seafloor. The main conclusion from the study is that most trends from parameter variations are weak and often overshadowed by a more stochastic variation caused by the inherent complexity of the mechanical behaviour during collapse.

Copyright © 2004 by ASME

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