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Engineering, preparation, removal & disposal of the original Hod production platform from the southern Norwegian North Sea.
Company : Aker BP
Location : Southern Norwegian North Sea, 13 kilometres south of Valhall field
Water depth: 72 metres
Removal of topsides, jacket, conductors & template
Conductor removal using Allseas-engineered cutting solution
Scope of work
- Engineering, preparation, removal & disposal (EPRD) of 1,200-tonne topsides and 3,500-tonne jacket, conductors & subsea template
- Topsides preparations (incl. underdeck scaffolding & removal of obstructions under cellar deck for access to lift points, installation of shear brackets & uplift restrainers on legs, cutting & removal of caissons, reinstatement of Allseas-engineered lift points at work deck elevation)
- Cutting of grouted platform legs
- Jacket preparations (incl. lift point reinforcements (leg interfaces), releasing mechanical connection of conductors with jacket, subsea cutting of jacket legs, risers & conductors, subsea cutting conductors (below seabed), cutting template anchor piles (below seabed))
- Load-in of facilities to disposal yard (Stord, Norway)
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Specials & challenges
- Offshore preparations carried out in both “cold” and “live” oil & gas platform environments in Valhall field
- Removal of decommissioned facilities from live field
- Tight vertical clearances between Pioneering Spirit & topsides during removal due to field subsidence
- Very small air gap between water level and actual field weld for lift points on jacket
- Small horizontal clearances between TLS & platform (small platform results in lift points close to legs and caissons)
- Pre-lift activities and welding close to the splash zone
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