Delft University of Technology
Ship Hydromechanics Laboratory
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PROCEEDING
1 P1993-1
O F T H EFOURTH INTERNATIONAL CONFERENCE
ONTHE JACK-UP PLATFORM
' B E N T H A M P R E S S L O N D O N
PROCEEDINGS
O F T H EFOURTH INTERNATIONAL CONFERENCE
ONTHE JACK-UP PLATFORM
DESIGN, CONSTRUCTION AND OPERATION
1993 ^ . . ^
EDITED BY
L F BOSWELL AND CD'MELLO OCEAN ENGINEERING RESEARCH CENTRE
DEPARTMENT OF CIVIL ENGINEERING CTTY UNIVERSITY
B E N T H A M PRESS L O N D O N
PROCEEDINGS OF T H E FOURTH INTERNATIONAL CONFERENCE O N T H E JACK-UP PLATTORM HELD AT CITY UNIVERSITY LONDON ON 21 & 22 SEPTEMBER 1993.
ORGANISED BY: OCEAN ENGINEERING RESEARCH CENTRE DEPARTMENT OF CIVIL ENGINEERING CnYUNFVERSnY
NORTHAMPTON SQUARE LONDON E O V O H B
SPONSORED BY: THE INSTITUTION OF MECHANICAL ENGINEERS THE ROYAL INSTITUTE OF NAVAL ARCHITECTS SHELL INTERNATIONAL
NOBLE DENTON GROUP
MARINE TECHNOLOGY DIRECTORATE THE STTEEL CONSTRUCHON INSTITUTE
BRmSH UBRARY CATALOGUE-IN-PUBLICATION DATA. A CATALOGUE RECORD FOR THIS BOOK IS AVAILABLE FROM THE BRTHSH UBRARY.
ISBN 1 874612 11 0
Copyright © BPP Technical Services Ltd 1993
All rights reserved. No part of these course notes may be reproduced or transmitted in any form or by any means (including photocopying and recording) without the written permission of the copyright holder except in accordance with the provisions of the Copyright Act 1956 (as amended) or under the terms of a licence issued by BPP Technical Services Ltd, 2 Tavistock Place, London W C I H 9RA. The written permission of the copyrighl holder must also be obtained l>efore any part of this publication is stored in a retrieval system of any nature. Applications for the copyright holder's written permission to reproduce, transmit or store in a retrieval system any part of this publication should be addressed to BPP Technical Services Ltd.
THE BENTHAM PRESS IS A N IMPRINT OF BPP TECHNICAL SERVICES LTD 2 TAVISTOCK PLACE LONDON WC1H9RA
Preface
Jack-up drilling platforms are used for the exploration and operation of offshore oil and gas fields, as well as for the servicing of fixed structures. Originally designed for use in shallow waters, they are being used increasingly in deeper conditions. They have the major advantage of being re-usable so helping marginal field development. Jack-up drilling platforms contribute to a significant part of offshore engineering activity around the world. The application of the platfonn is continuously being extended towards deeper waters and harsher environments. Designs have been developed for operation in areas with maximum wave heights of 30 m and water depths well beyond 100 m.
The first intemational conference relating to the Jack-up platform in 1985 was a great technical success and the papers which were presented represented a landmark in the presentation of relevant technical material.
Much has happened within the oil and gas industry since 1985, but the n^^essity to maintain an effort to understand and agree upon the performance of Jack-ups has always remained. It seemed quite natural, therefore, to organise further conferences in which more recent and relevant material would be presented.
A number of areas are currently of considerable interest to the Jack-up industry and these include site assessment procedures, reliability, acceptance, hydrodynamic loading, dynamic behaviour of platforms, foundation fixity and platform instrumentation.
The fourth intemational conference considers many aspects of these areas and a particular attempt has been made to present associated material. The papers presented at the conference have been written by practising professionals who are recognised experts firom the UK, Europe and the USA.
This volume, therefore, represents a further stage in the presentation of material to improve our understanding of the behaviour of Jack-up platforms.
L.F.Boswell CD'MeUo September 1993
Jack-Up in Perspective ƒ H Vugts, Shell International CONTENTS
Keynote
Evaluating Jack-Up Dynamic Response Using Frequency Domain Methods and the Inertial Load Set Technique
E ƒ Greeves, B H Jukui andPGF Sliggers, Shell International
Non-linear Dynamic Behaviour of Jack-Up Platform D Karunakaran, N Spidsoe, Sintef and O Gudmestad, Statoil
/
Failure Probability of a Jack-Up Under Environmental Loading in the Central Nortii Sea
ƒ Wvan der Graaf, P S Tromans, L Vanderschuren, Shell Research
and B H Jukui, Shell International
Results of a Jack-Up Measurement Programme in the North Sea and their Comparison with the Structural Ajwlysis
C N Springett, Santa Fe Drilling Co, R WP Stonor and X Wu,
Noble Denton Group
Structural Effects of Foundation Fixity on a Large Jack-Up
The Static Strength and Behaviour of Joints in Jack-Up Rigs
M Lalani, MSL Engineering Ltd, N Nichols, Matsu and J V Sharp, Health and Safety Executive
Skirted Spudcans - Extending Operational Depth and Improving Performance
M Baerheim, Statoil 5
G Svano, Sintef and TI Tjelta, Statoil 7
Flexible Membrane Supports for Jack-Up Rigs
ƒ IV Bunce, Consultant, P J George, Sage Engineering A G
Engineering and Human Factors Analysis in MODU Safety Cases
ƒ C Trickey, P Budgeon and ] Stiff, Noble Denton Group 9
The Safety of Jack-Ups in Transit
A R Mcintosh, Health and Safety Executive 10
Limit Motions for Jack-Ups Moving onto Location
PSKLai,TC Leans, Global Maritime Ltd, P A Fneze, Paul A Frieze
& Associate, B L Miller andi A A Smith, Global Maritime Ltd 11
Stability and Seakeeping Review for Jack-Ups i n Transit
R G Standing and S J Rowe, BMT Offshore Ud 12
Fire and Blast - New Developments
ƒ Tolloczko, Steel Construction Institute 13
Jack-Up Tender Assist Drilling Experience in the North Sea
