General information
| Client | Aker BP |
| Project | Valhall OVD & Hod removals |
| Year | 2019-2025 |
| Location | Norwegian North Sea |
| Vessels | Pioneering Spirit, Fortitude, Oceanic |
| Max. water depth | 100 m |
Valhall OVD & Hod removals
Scope of work
- Engineering, preparation, removal, and disposal of the accommodation (QP), drilling (DP) and production (PCP) structures (topsides, jackets and bridges) from the original Valhall complex
- Engineering, preparation, removal, and disposal of the nearby unmanned Hod A platform and 2/4G jacket
- Pre-lift preparation work and cutting of platform legs
- Design and fabrication of TLS yokes interfaces, navigational aid and grillages
- Jacket pile and leg cutting, and template removal
- Transfer and load-in of structures to Aker Solutions’ (Norway) disposal facility at Stord, Norway for recycling
Project specials
- Offshore preparations carried out in both “cold” and “live” oil and gas platform environments in Valhall field
- Use of internal lifting tools to avoid excessive above water jacket preparations
- Removals of structures with all of the vessel’s lifting systems (TLS, JLS and 5000-tonne crane)
- Multiple campaigns spread across several years
- Fast track removal operations
- Platform subsidence (+/-7 m); working and welding close to splash zone
- Small vertical clearances during removal due to small air gap (Pioneering Spirit at max draught of 27 m)
- PCP topsides removal by TLS while DP jacket at vessel aft
- Tight early deliverables schedule to accommodate summertime prep work
- Limited clearance with adjacent platforms during topsides removals
