Greater Britannia Area

27 kboepd (2023 production)

Greater Britannia Area (GBA) was Harbour’s second largest producer in 2023 at 27 kboepd (2022: 31 kboepd). Natural decline was moderated by continued outperformance at satellite fields Callanish and Brodgar, coupled with a high level of operational efficiency. The successful appraisal ofthe Leverett discovery saw good flow rates achieved on test with the potential to be tied back to the Britannia platform in the future. We will return to infill drilling at Callanish and Brodgar in 2024, with further exploration planned at Brodgar North and Gilderoy all within tie-back distance of existing infrastructure.

Britannia - 58.7% operated

Britannia in Block 16/26 of the UK central North Sea sits approximately 210-kilometres north east of Aberdeen. The complex consists of a drilling, production and accommodation platform, a long-term compression module of mono-column design and a 90-metre bridge connected to a production and utilities platform. Britannia is one of the largest natural gas and condensate fields in the North Sea. Commercial production began in 1998. Condensate is delivered through the Forties Pipeline to the oil stabilisation and processing plant at Kerse of Kinneil near Grangemouth and natural gas is transported through a dedicated Britannia pipeline to the Scottish Area Gas Evacuation (SAGE) facility at St Fergus.

Brodgar – 93.75% operated

Brodgar is a gas condensate accumulation located in Block 21/3a. This subsea development lies approximately 41 kilometres west of Britannia and produces via a subsea tie-back to the Britannia Bridge Linked Platform (BLP). Brodgar is controlled remotely from Britannia.

Callanish – 83.5% operated

The Callanish field lies approximately 25-kilometres from Britannia in Blocks 15/29b and 21/4aN. It was developed as a subsea tie-back to the Britannia BLP. It comprises two accumulations; a main field, which was discovered in 1999 and an outlier to the west separated by a structural saddle. Callanish is controlled remotely from Britannia.

Enochdhu – 50.0% operated

Enochdhu in Block 21/5a is a single well subsea tie-in to the Callanish manifold, which sits around 8-kilometres south-east of it. First production was achieved from Enochdhu in 2015.

Alder – 26.3% non-operated

Alder lies approximately 160-kilometres from the Scottish coastline and 60 kilometres from the UK median line. It is a high pressure, high temperature (HP/HT) gas condensate field, which was developed via a single subsea well tied back to the Britannia BLP via a 28-kilometre production flowline. Fluids from Alder are processed on a dedicated module attached to the BLP prior to export.

Britannia complex
Britannia bridge-linked platform (BLP)
Enochdhu launch
Britannia field schematic
Aerial view of Britannia platform
Installation of the Alder module on the Britannia BLP