Jack-up rig engineering and modifications
Structural analysis, design and drawings for jack-up modifications, from helidecks and cranes to legs, cantilevers and tow, on 1000+ documented projects in India, the Middle East and the North Sea.
- 1000+documented jack-up projects
- 800+projects in the Middle East
- 200+projects in India, including for ONGC
Every part of the rig, with the projects to prove it
All 16 of our documented jack-up projects, grouped by where on the rig the work was done.
Legs and spudcans
Leg length modifications, leg damage assessment and spudcan footing studies.
- Starboard leg deformation: spudcan preload studyNorth Sea
- Bow leg brace damage studyNorth Sea
Cantilever and skidding
Conversion of slotted rigs to cantilever type, cantilever extensions and securing for tow.
- Skidding system check for a 15 ft cantilever extensionMiddle East
- Cantilever and substructure securing for ocean towMiddle East
Drill floor and derrick
Wind walls, shale shaker house, BOP and riser gantry crane foundations, moonpool deck and drill floor fittings.
- Derrick wind wall installationMiddle East
- ST-80 floor socket at the drill floor
- 16-inch mouse hole installationIndia
Helidecks and life-saving
Helideck upgrades for heavier helicopters and new lifeboat and rescue boat platforms.
- Helideck upgrade for MI-17 operationsMiddle East
- 60-person lifeboat platform at the bowIndia
Deck equipment and modules
Crane, winch and equipment foundations, deck framing, room roofs and storage decks.
- SMIT bracket relocation, 150 MT SWL
- New emergency generator roomMiddle East
- Sea Jet reel platform on Main Pass IVMiddle East
- Airman compressor platformMiddle East
- 30-inch BOP two-point lifting ring for ONGCIndia
Jacking and transport
Jacking system analysis, hull transportation and sea-fastening design for the tow.
- High Island IV gear unit cutting-sequence analysisMiddle East
- Hull transportation and sea-fastening design for ONGCIndia
Want the details? Each project has its scope, software and location on the projects page.
See all 16 jack-up projectsBeyond structural modifications
- Sponson additionStability and structural design
- Marine operating manualsPrepared for the rig's operations
- Feasibility studiesVessel modifications for better operations
- Mooring analysisStatic, dynamic and transient
- General arrangementsMain deck, lower deck, drill floor, machinery deck and accommodation
Three jobs, three parts of the rig
Helideck upgrade for MI-17 operations
A self-elevating drilling unit had to take the 13 t MI-17. We delivered the structural analysis, reinforcement details and a complete detailed drawing package.
Bow leg brace damage study
Three damaged braces on the bow leg. We checked local strength and buckling in operating conditions and defined the reinforcement needed.
Hull transportation and sea-fastening design
We analysed the hull under tow inertia loads, designed the sea fasteners and supplied detailed fabrication drawings.
From your planned change to yard-ready drawings
- 1
Share the rig and the change
Rig drawings, the equipment or modification planned, and the operating and tow conditions.
- 2
Agree scope and conditions
We confirm the load cases (operating, elevated, transit, ocean tow) and the deliverables.
- 3
Model and analyse
Global and local models of the affected structure, in ANSYS, SACS or MOSES.
- 4
Design the reinforcement
Reinforcement, foundations or sea-fastening wherever the checks show they are needed.
- 5
Drawings and report
Analysis report and detailed or fabrication drawings, ready for the yard.
The tools we use, and what you receive
Software
Follow a link to see our training course for that tool.
- ANSYS
- SACS training
- MOSES training
- MAXSURF training
- AutoCAD
Authorized Bentley partner. We supply and train on SACS, STAAD.Pro, MOSES and MAXSURF across India and the Middle East. About the partnership
What you receive
Depending on the scope of the job.
- Structural analysis reports
- Reinforcement details
- Detailed drawing packages
- Fabrication drawings
- General arrangement drawings
- Marine operating manuals
What rig owners and drillers ask us
Which jack-up modifications have you engineered?
Helideck upgrades, lifeboat platforms, derrick wind walls, drill floor fittings, crane and equipment foundations, cantilever extensions, leg length modifications and slotted-to-cantilever conversions, among others.
Do you provide drawings, or only analysis?
Both. Recent work includes a complete detailed drawing package for a helideck upgrade and fabrication drawings for sea fasteners.
Can you check a modification in elevated and transit conditions?
Yes. For example, we checked a derrick wind wall and a Sea Jet reel platform in both elevated and ocean transit conditions.
Can you assess leg damage?
Yes. We have studied a bow leg with three damaged braces and a starboard leg deformation linked to spudcan preload, both in the North Sea.
Where have you worked on jack-ups?
In India, including work for ONGC, in the Middle East and in the North Sea, across 16 documented projects.
Planning a rig modification or upgrade?
Send us the rig drawings and the change you have in mind. An engineer will come back with questions and a scope.