EPRD of Ten Platforms Out of the
Greater Ekofisk Area
Jan Gravekamp, Heerema Marine Contractors
Ekofisk I Cessation Project Engineering, Preparation, Removal and Disposal
(EPRD) of Platforms
Decommissioning Conference St.
Andrews
08 October 2014
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Presentation topics
Schedule & Execution Principle
Scope of Work EPRD
HSE
Newly Developed and Implemented Technologies
Disposal
Success Criteria/Lessons Learnt
Lessons Learnt
SSCV Optimization Solutions
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Schedule & Execution Principle (Ekofisk EPRD)
Offshore Execution in 4 phases
1 Platform Visits (helicopter)
2 Make Safe
3 Topsides Removal
4 Jacket Removal
Subsea
inspections
by ROV’s
Topsides
hook down
and removal
One Vessel approach
Flexible Removal Schedule - Defined Milestones
Schedule & Execution Principle Topside Removal
Reversed Installation
Transportation on SSCV Deck avoiding barges and minimising weather
risk
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Schedule & Execution Principle Jacket Removal
Jackets (Launch Jackets)
Two Pieces, Horizontal Split
Single Piece
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EPRD Contract Scope of Work 2007-2014
Albuskjell
1/6A
Albuskjell
2/4F
COD 7/11A West Ekofisk
2/4D
Ekofisk 2/4R
EDDA 2/7C
Norpipe
37/4A
Norpipe
36/22A
Ekofisk 2/4P Total removed 120.000 mT
Ekofisk 2/4W
Ekofisk
2/4Q
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Main Parties Involved
Client :
Main Contractor EPRD :
Subcontractors :
London Marine
Consultants
HSE
Safety Records 2008-2014:
- ~ 3.200.000 Offshore manhours involved
- 11 Medical Treatment Cases
- 24 First Aid Cases
- ZERO LTI’s!
All work has been executed with the highest focus
on Safety
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HSE Focus Areas throughout EPRD Project
Onshore Preparations:
Focus on Working conditions
Safety Booklets
Incident Injury Free Trainings
Organization
Safety Roadshow with subcontractors
Risk sessions
Lessons learned after each campaign and implementing
of Lessons Learnt
Offshore:
Quantitative HSE Measurements
Crew Information sessions
Permit to Work
Barrier Management
Use of the right PPE
Health monitoring program
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Newly Developed and Implemented Technologies
Single Piece Jacket Lift
«To pin or not to Pin»
- Subsea pinning of main piles to jacket legs
- Subsea Drilling tool
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Disposal
AF Offshore Decom Yard Vats:
Deepwater Quay
Drainage Control System
Equipment development
Dust Control
Hot Cutting Control
Marine growth Issues
Environmental Monitoring Program
Hazardous Waste management
Recovery Rate 97%
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Success Criteria/Lessons Learnt
Smooth offloading operations at Vats:
- Site moves – schedule flexibility – quay availability
Motivated & dedicated project teams
- Organisation split Hookdown/disposal and R&T
- Platform Construction manager offshore
- Good cooperation and open communication
- three main parties; COPSAS, HMC, AFD
Safe and efficient execution within schedule
Expect the unexpected
Long term relationship subcontractors – “good
building block”
Continuous HSE focus is a must
Lessons Learnt
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4 Phase execution Philosophy - successful and efficient
- Robust basis for “expecting the unexpected”
Innovative Solutions :
- Single piece jacket lift
- Pinning operation
- Cutting tools very reliable
“One-Vessel” approach
- Multitasking: Hook-Down – Removal – Subsea
- Accommodation
Reverse Installation - proven efficient
- Ample crane capacity
- Minimizes offshore construction
- Limits environmental risks
- Increased workability - transported on board the crane vessel
SSCV Optimization Solutions
Use of existing platform facilities from which
Hookdown can be carried out
Accommodation
Cranes
Make use of existing Platform utilities where
possible e.g. firewater, Power supply, compressed
air etc.
OSV for Jacket inspection work and Jacket
preparation work
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Decommissioning is challenging and ground
breaking
Thank you for your
attention