Schiehallion Oil Field

Operator: BP
Country: UK
Location: In the Atlantic, 100 miles to the west of Shetland and Orkney
Production start: 1998
Partners: BP (33.3%) with Shell (44.9%), Harbour Energy (10.0%) and Ithaca Energy (11.8%)
Type: Oil
Estimated Reserves: recoverable reserves of 340 million barrels of oil at start up
Production Volume:

Schiehallion lies in 375 metres water depth in UK blocks 204/20, 204/25a, 204/25b, 205/16 and 205/21b and has recoverable reserves of 340 million barrels of oil.
The Schiehallion development centred on 29 seabed wells in four drilling centres, producing oil via manifolds through steel pipelines and then flexible risers into the purpose-built Schiehallion FPSO, a floating production, storage and offloading vessel.
The development was based upon producing 340 million barrels contained within the main field and a further 85 million barrels from the Loyal reservoir which overlies it.
Peak production of 154,000 barrels of oil a day is expected and the FPSO could store over 900,000 barrels.
Gas is transported on the West Of Shetlands Gas Pipeline System
The field was redeveloped in the Quad 204 Redevelopment Project which utilises the Glen Lyon FPSO
The Alligin development has included new subsea infrastructure, consisting of gas lift and water injection pipeline systems, and a new controls umbilical.

**Brown & Root:** Project management, the design and fabrication of the FPSO's topsides and for the vessel installation
**Harland and Wolff:** Design and build the 950,000 barrel capacity vessel
**SBM:** Design and build the turret and moorings
**Brown & Root McDermott Fabricators (BARMAC):** Fabrication of 6,300 tonnes of process topsides
Extended Living Quarter
**Coflexip Stena:** Design and supply of Risers
**BiFab:**
- Fabrication of Upper Turret for FPSO Including Duplex Process Pipework and the LQ Module
- Hex Replacement Module
- Extended Living Quarter

1993 - The Schiehallion Oil Field was discovered
1995 - Extended Well Test performed
1996 - The Department of Trade and Industry approved plans to develop the "Schiehallion" oilfield and its satellite "Loyal"
1998 - Production starts
2009 - Technip awarded two contracts for the Schiehallion field
2011 - Quad 204 Redevelopment Project approved by partners
2011 - HHI awarded contract for new FPSO
2012 - Hess Reaches Agreement for Sale of 15.67 % to Shell
2012 - Shell acquired 5.9% from Murphy Oil
2013 - OMV acquires an additional 5.88% from Statoil
2017 - Siccar Point became a shareholder after acquiring OMV UK
2017 - Chrysaor acquired a 10% stake in the field from Shell.
2017 - First oil from the redeveloped field
2018 - Approval given for the Alligin field
2020 - First oil from Alligin
2021 - Premier Oil and Chrysaor merge to create Harbour Energy
2022 - Ithaca became a partner after acquiring Siccar Point Energy

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