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Sixth International Conference
The Jack-Up Platform
Design, Constmction & Operation
September 23rd and 24th 1997
London, England
EDITED BY
L F BOSWELL, C D'MELLO & W J SUPPLE
CITY UNIVERSITY
AST PRESS
HOVE
PROCEEDINGS
O F T H E
Sixth International Conference
The Jack-Up Platform
Design, Construction & Operation
1997
London, England
EDITED BY
L F BOSWELL, C D'MELLO & W J SUPPLE
CITY UNIVERSITY
AST PRESS
HOVE
Proceedings of the Sixth International Conference on the Jack-Up Platform, Design, Construction & Operation, held at City University, London on September 23rd and 24th 1997.
Organised by: Ocean Engineering Research Centre Department of Civil Engineering City University Northampton Square London E C l V OHB Telephone (+44) (0)171 477 8140 Fax (+44) (0)171 477 8570 ISBN 0 9531709 0 X
PubUshed by AST Press
P R E F A C E
Jack-Up Platforms are used for the exploration and operation of offshore oil and gas fields, as well as for servicing fixed platforms. Originally designed for use m shallow waters, they are being used increasingly in deeper conditions. They have the major advantage of being reusable so helping marginal field development. Jack-Up drilling platforms contribute to a significant part of offshore engmeering activity around the world. The application of the platform is contmuously being extended towards deeper waters and harsher envuronments. Designs have been developed in areas with wave heights of around 30m and water depths well beyond 100m.
The first five mternational conferences held at City University m 1985, 1989, 1991, 1993 and 1995 were a considerable technical success and much was achieved to formulate an ongoing exchange of ideas. Considerable change has taken place in the petroleum industry in recent years and it would seem appropriate to present the developments in Jack-Up technology which have occurred since the last conference. In particular, the development of the SNAME " Site specific Assessment of Mobile Jack-Up Units" was presented at the 1993 Conference and it is relevant to consider its effect since publication in 1994. Furthermore, new Design and Construction Regulations are in place for the United Kingdom Continental Shelf and these are discussed in the proceedings.
The papers presented at the Sixth International conference have been written by practising professionals who are recognised experts from Europe and the USA. This volume, therefore, represents a fiirther stage in the presentation of material to hnprove our understanding of the behaviour of Jack-Up platforms.
L F Boswell C D'Mello W J Supple September 1997
CONTENTS
1. Jack-Up Foundation Load-Displacement Assessment H. van Langen (Shell UK Exploration & Production) P. C. Wong (Exxon Production Research Company) E. T. R. Dean (Cambridge University)
2. Sliding Probability in the Context of Current Assessment Practice M. J. R. Hoyle (Noble Denton Europe)
R. O. Snell (BP Exploration Operating Co. Ltd.)
3. Spudcan Fixity: Lessons Learned from the Liftboat Industry
W. P. Stewart, B. A. Stone, J. N. Brekke (Stewart Technology Associates) 4. Centrifuge Modelling of Spudcan Foundations Under Combined Loads
I. Temperton (Noble Denton Europe)
5. Full-Scale Measurements from a Large Deepwater Jack-Up Platform D. N. Karunakaran, N Spidsoe (SINTEF)
M. Baerheim (Statoil)
6. Measured Spudcan Fixity: Analysis of Instrumentation Data from Three North Sea Jack-Up Units and Correlation to Site Assessment Procedures C. N. Springett (Santa Fe International Corp.)
I. Temperton, R. W. P. Stonor (Noble Denton Europe)
7. Recovery of the Jack-Up 'Harvey H . Ward' Following Impact Damage to a Leg
R.J.Allan,(Reading & Bates) P R Geiger (Friede & Goldman)
R. W. P. Stonor (Noble Denton Europe) 8. Jack-Up and Jacket Platforms:
A Comparison of System Strength and Reliability A. C. Morandi, P. A. Frieze* (MSL Engineering Ltd)
M. Birkinshaw.D. Smith, A. Dixon (Health & Safety Executive) (* now at Paul A. Frieze and Associates)
9. Calibration of an SDOF-based Dynamic Analysis Procedure Including Non-Linear Foundation Fixity
10. System Reliability Analysis of Jack-Up Structures: Possibilities and Frustrations
B. Boon, A. Vrouwenvelder, S. Hengst, H. Boonstra, M. Daghigh (Delft University)
11. Modelling of Jack-Up Response for Fatigue Testing of Weldable High Strength Jack-Up Steels Under Simulated Service Conditions
L . S. Etube, F. P. Brennan, W. D. Dover (University College London) 12. Assessment of Jack-Up Boat Impact Analysis Methodologies
P. Gjerde, S. J. Parsons (DnV) S. C. Igbenabor (MaTSU)
13. Hydrogen Assisted Cracking in Jack-Ups: Myth or Reality? J. C. Barker (MaTSU)
A. Dixon (Health & Safety Executive)
14. Performance of High Strength Steels Used in Jack-Ups J. V. Sharp, J. Billingham (Cranfield University)
A. Stacey (Health &. Safety Executive)
15. Use of a Jack-Up as a Permanent Installation for the Marginal SIRI Field M. Baerheim (Statoil)
D. Manschot (MSC)
T. Nortvedt (Kvaemer Oil & Gas) 16. T P G 500 Production Jack-Up Design:
Why is it Different from a Drilling Jack-Up? P. A. Thomas (Technip-Geoproduction)
17. Jack-Ups: Classification Past, Present and Future J. J. Stiff (American Bureau of Shipping Marine Services)
B. P. M. Sharpies, R. D. Bowie (American Bureau of Shipping Americas) 18. Design and Construction Regulations: Integrity and Verification Aspects
