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LONGITUDINAL RESONANT BEHAVIOUR OF DEEPWATER RISERS CALCULATED USING RECORDED HEAVE SEQUENCES

This paper is devoted to the longitudinal resonant behaviour of deepwater risers and drillstrings of the hung-off mode. Dynamic tensions associated with this phenomenon are of increasing concern for drilling risers and deepsea mining systems, as water depths increase beyond 2,000 meters. They also pose a potential problem for very long drillstrings. The paper presents experimental data relating to the heave response of a drillship at short periods, which were obtained by means of a "Numerical Pallograph" installed on the drill ship JOIDES RESOLUTION, operated by the Ocean Drilling Program. An improved formula for the longitudinal drag, based on the results of recent tank tests, is also presented. By using heave sequences recorded by the pallograph, it has been possible to show that the calculated behaviour of a riser with a natural period as short as 4 seconds is already significantly resonant when hung off such a drillship. The problem is accentuated as the natural period is increased.

  • Supplemental Notes:
    • OMAE 1992, 11th Intl Conf on Offshore Mechanics & Arctic Engng; 7-12 June 1992; Calgary, Canada. Sponsored by ASME et al. Procs. Publ by ASME. Vol 1, Pt A, p 249 [8 p, 9 ref, 1 tab, 8 fig]
  • Authors:
    • Besancon, O
    • Sparks, C P
    • Guesnon, J
  • Publication Date: 1992

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00704757
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM