Greater Britannia Area

31 kboepd (2022 production)

The Greater Britannia Area (GBA) was Harbour's largest producer in 2022 at 31 kboepd (2021: 33 kboepd). Delivery was supported by high operating efficiency and consistent reservoir outperformance from satellite fields Brodgar and Callanish. Harbour plans to return to drilling at Callanish in the second half of 2023 with the F6 infill well scheduled as part of a wider rig share programme with North Sea operator NEO. As part of that programme, Harbour will also appraise the Leverett discovery which, if successful, would be tied back to GBA infrastructure. This follows the equalisation of interests between NEO and Harbour across the Leverett licences in 2022. Harbour is also maturing further exploration and appraisal opportunities in the area as well as a potential infill opportunity on Brodgar targeting an area to the east of the field.

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