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Fully Coupled EDS/Drift-Off Analysis for a Harsh Environment, Deepwater Site

[+] Author Affiliations
Enda O’Sullivan, Michel Dib

MCS, Houston, TX

Julian Soles

GlobalSantaFe Corporation, Houston, TX

Paper No. OMAE2004-51631, pp. 1133-1142; 10 pages
doi:10.1115/OMAE2004-51631
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

In support of a well drilled in the Great Australian Bight (GAB) by the Glomar Jack Ryan dynamically-positioned (DP) drillship in 4308 feet of water in early 2003, drift-off riser analysis was carried out to establish “alert” offsets for the emergency disconnect sequence (EDS). Drift-off analysis of the vessel/riser system is a key element to the successful management of the riser on a DP drillship, as it deals with protecting the equipment in case of the potential loss of vessel power. At this well site, high seastates combined with wind and current conditions dictate that drilling should be carried out in accordance with “well-specific operating criteria” (WSOC). These criteria assist the crew by identifying the metocean conditions that limit various operations. Analysis of the drilling riser was carried out for drift-off, hang-off and recoil scenarios to establish certain criteria to avoid exceedence of allowable limits in the riser and conductor pipe. The novel aspect of this drift-off analysis is the use of a fully-coupled, time-domain, finite element solution. The fully-coupled aspect of this solution models the vessel / tensioner system / riser / LMRP / BOP / wellhead / conductor / soil interaction process more accurately and thus allows for less conservativism when compared to uncoupled solution methods. This enables the rig to work in areas that might otherwise be considered marginal due to the anticipated time spent waiting on weather.

Copyright © 2004 by ASME

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