General information
Jack-ups are mainly used as drilling units, temporarily stationed at a field until their task has been completed and the platform is floated elsewhere. The operational flexibility of the platform may be an explanation for the wide-spread use of this type of platform. The principle of using jack-up legs to elevate a platform above the waves is nowadays no longer only applied to drilling units, but also to other vessels that require a stable platform to carry out their task, such as installation vessel for offshore wind turbines.
Jack-ups are mainly used as drilling units, temporarily stationed at a field until their task has been completed and the platform is floated elsewhere. The operational flexibility of the platform may be an explanation for the wide-spread use of this type of platform. The principle of using jack-up legs to elevate a platform above the waves is nowadays no longer only applied to drilling units, but also to other vessels that require a stable platform to carry out their task, such as installation vessel for offshore wind turbines.
Services & Activities
The Offshore Department has a lot of experience in jack-up model tests and numerical simulations in the field of motions and accelerations and concerning the loads on the jack-up legs. The impact of green water and slamming on the jack-up is part of the expertise of the Offshore Department as well. Furthermore, the scope of work regularly involves the towing of a jack-up, including the analysis of possible fishtailing instabilities.
The Trials & Monitoring Department has been involved in full-scale measurements on several jack-ups during transport. Platform motions and accelerations, as well as hull loads were measured and analysed.
The Offshore Department has a lot of experience in jack-up model tests and numerical simulations in the field of motions and accelerations and concerning the loads on the jack-up legs. The impact of green water and slamming on the jack-up is part of the expertise of the Offshore Department as well. Furthermore, the scope of work regularly involves the towing of a jack-up, including the analysis of possible fishtailing instabilities.
The Trials & Monitoring Department has been involved in full-scale measurements on several jack-ups during transport. Platform motions and accelerations, as well as hull loads were measured and analysed.
Facilities & Tools
Jack-ups are tested in the following MARIN facilities:
Jack-ups are tested in the following MARIN facilities:
- Offshore Basin: DP model tests in combined current, waves and wind
- Shallow Water Basin: DP model tests in combined current, waves and wind
- Seakeeping and Manoeuvring Basin: model tests in waves
The behaviour of jack-ups is simulated with the following tools : (DIFFRAC and DRIFTP for MARIN internal use only)
DIFFRAC: 3-D potential theory including wave diffraction
DRIFTP/DBDRIFT: Second order wave excited (drift) forces
WINDOS: Assessment of wind loads on ships and offshore structures
DRIFTP/DBDRIFT: Second order wave excited (drift) forces
WINDOS: Assessment of wind loads on ships and offshore structures
Software Sales
Some software tools are available for commercial use outside MARIN. A complete overview of these software tools for sale can be found under Software Sales.
Some software tools are available for commercial use outside MARIN. A complete overview of these software tools for sale can be found under Software Sales.
Experience record
The list below gives a review of jack-up model tests and simulation studies carried out at MARIN :
The list below gives a review of jack-up model tests and simulation studies carried out at MARIN :
- Self Elevating Platform model tests (2004)
- Shah Deniz transportation tests (2003, 2004)
- SAFETRANS JIP
Most recent papers on jack-ups presented by MARIN
(complete overview of papers can be found under Publications)
(complete overview of papers can be found under Publications)
Safetrans: A New Software System for Safer Rig Moves
Aalbers A.B, Cooper C.K, Nowak S, Lloyd J.R, Leenaars C.E.J. and Vollen F., Proceedings Jack-up Conference, London, 2001
Design Aspects for Transport of Jackup Platforms on a Barge
R.P. Dallinga, A.B. Aalbers, and J.W.W. van der Vegt, Offshore Technology Conference (OTC), Houston, 1984
Aalbers A.B, Cooper C.K, Nowak S, Lloyd J.R, Leenaars C.E.J. and Vollen F., Proceedings Jack-up Conference, London, 2001
Design Aspects for Transport of Jackup Platforms on a Barge
R.P. Dallinga, A.B. Aalbers, and J.W.W. van der Vegt, Offshore Technology Conference (OTC), Houston, 1984
Most recent jack-up articles written for MARIN Report
(complete overview of articles can be found under Publications)
(complete overview of articles can be found under Publications)
Pioneering purpose-built wind turbine installation vessels under test
Willemijn Pauw & Arjen Koop, MARIN Report, 2010
Elevated Support Vessel passes tests with flying colours
Arjan Voogt, MARIN Report, 2008
Willemijn Pauw & Arjen Koop, MARIN Report, 2010
Elevated Support Vessel passes tests with flying colours
Arjan Voogt, MARIN Report, 2008
Contact
For more information on how MARIN can help your organisation with jack-ups, please contact:
For model test and simulation activities: Offshore Department
For full scale measurements: Trials and Monitoring Department
For more information on how MARIN can help your organisation with jack-ups, please contact:
For model test and simulation activities: Offshore Department
For full scale measurements: Trials and Monitoring Department