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Titre du document / Document title

Recovery of an elevated jack-up with leg bracing member damage

Auteur(s) / Author(s)

STONOR R. W. P. (1) ; HOYLE M. J. R. (1) ; NELSON K. (2) ; SMITH N. P. (2) ; HUNT R. J. (3) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Noble Denton Europe Ltd., Noble House, 39 Tabernacle Street, London EC2A 4AA, ROYAUME-UNI
(2) GlobalSantaFe Corporation, 15375 Memorial Drive, Houston Tx 77079, ETATS-UNIS
(3) Shell UK Exploration and Production, 1 Altens Farm Road, Nigg, Aberdeen AB12 3FY, ROYAUME-UNI

Résumé / Abstract

During the winter of 2001-2002, while drilling over the Leman Delta platform in the southern North Sea, a modern harsh-environment jack-up operating in shallow water on a hard sandy bottom encountered an incrementally increasing, partly scour-induced, problem with eccentric spudcan loading and associated rack phase difference (RPD). After 3 months on location, while the unit was in the process of being re-levelled for the third time, leg braces were damaged. The decision was taken to move the jack-up to a shipyard to repair the damage, and this paper describes the analytical and practical steps that were taken to do so in the least hazardous manner. The mechanics of the RPD effect are described in detail, and the observed bracing damage is assessed against the theoretical models that were used to predict behaviour. Some general conclusions on the best methods of handling units suffering this type of damage are drawn, and suggestions are made on how to minimise similar damage in the future.

Revue / Journal Title

Marine structures    ISSN  0951-8339 

Source / Source

2004, vol. 17, no 3-4 (191 p.)  [Document : 27 p.] (bibl.: dissem.), pp. 325-351 [27 page(s) (article)]

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Kidlington, ROYAUME-UNI  (1988) (Revue)

Mots-clés anglais / English Keywords

Strength

;

Construction parameter

;

Structural member

;

Repair

;

Failure analysis

;

Offshore jack up platform

;

Offshore drilling platform

;

Offshore structure

;

Mots-clés français / French Keywords

Résistance mécanique

;

Caractéristique construction

;

Elément structure

;

Réparation

;

Analyse dommage

;

Plateforme autoélévatrice

;

Plateforme forage

;

Ouvrage en mer

;

Mots-clés espagnols / Spanish Keywords

Resistencia mecánica

;

Característica construcción

;

Elemento estructura

;

Reparación

;

Análisis avería

;

Plataforma autoelevadora

;

Plataforma perforación

;

Estructura plataforma sondeo marítimo

;

Mots-clés d'auteur / Author Keywords

Jack-up

;

Rack phase difference (RPD)

;

Damage

;

Recovery

;

Localisation / Location

INIST-CNRS, Cote INIST : 21685, 35400012066461.0090

Nº notice refdoc (ud4) : 16258699



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