Early-screening hazard map for jack-up rigs in the gulf of suez

B. Lietaert, T. Van Der Wal, S. Kortekaas, D. J.M. Ngan-Tillard, Leon van Paassen

Research output: Contribution to conferencePaper

Abstract

Many incidents with jack-up rigs are caused by punch-through of one or more of the legs from an upper zone of stronger soil into a lower zone of weaker soil. The resulting leg plunge may trigger platform tilt, causing possible risk of life, environmental damage and damage to rig. This paper presents a hazard map for the Gulf of Suez (GoS) that allows for early screening of sites with punch-through risks and for appropriate design of site investigation strategy. The hazard zoning relies on numerous data sources, notably regional geological and geomorphological, as well as geotechnical, information from 368 borehole locations. The hazard zoning considers punch-through conditions for conventional sand over clay profiles and for soil profiles with different degrees of pre-consolidation or the presence of cemented layers. Remarkably, hazard zoning was found to be largely independent of the precise geometry and loading conditions of common jack-up rigs used in the GoS. The highest probability for punch-through conditions is in deeper water environments (>50m water depth) and in areas where large wadis bring abundant sediment into the GoS.

Original languageEnglish (US)
Pages629-634
Number of pages6
StatePublished - Jan 1 2012
EventOffshore Site Investigation and Geotechnics 2012: Integrated Technologies - Present and Future, OSIG 2012 - London, United Kingdom
Duration: Sep 12 2012Sep 14 2012

Other

OtherOffshore Site Investigation and Geotechnics 2012: Integrated Technologies - Present and Future, OSIG 2012
CountryUnited Kingdom
CityLondon
Period9/12/129/14/12

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ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geotechnical Engineering and Engineering Geology

Cite this

Lietaert, B., Van Der Wal, T., Kortekaas, S., Ngan-Tillard, D. J. M., & van Paassen, L. (2012). Early-screening hazard map for jack-up rigs in the gulf of suez. 629-634. Paper presented at Offshore Site Investigation and Geotechnics 2012: Integrated Technologies - Present and Future, OSIG 2012, London, United Kingdom.