Gannet G

Location

The Gannet G field is situated approximately 180 km east of Aberdeen, within the UK continental shelf, in blocks 21/25, 21/30, 22/21, and 22/26a. It is in a water depth of about 95 meters.

Ownership and Operation

The Gannet field, including the Gannet G project, is operated by Shell, with Shell and Esso each holding a 50% stake in the field.

Geology and Reservoir

The Gannet G field reservoir is characterized by unsaturated oil without a gas cap. The reservoirs in the Gannet complex generally consist of good-quality turbiditic sands of Tertiary age, specifically from the Tay, Rogaland, Forties, Lista, and Andrew Formations. The reservoir depth for the Gannet fields ranges between 1,768 meters and 2,728 meters.

Production Details

• Reserves: The Gannet G field has recoverable reserves of 13 million oil equivalent barrels.
• Production Rate: The field started production at an initial rate of 7,500 barrels of oil per day.
• Infrastructure: The Gannet G field is developed through two new wells, which are connected via a 5km pipeline to the centrally located Gannet A platform for processing.

Development and Investment

• The development of the Gannet G field was part of a £40 million project initiated in mid-1999. This project involved the drilling of two new wells and the installation of the necessary pipelines to tie back to the Gannet A platform.

Processing and Export

• The oil and gas produced from the Gannet G field, along with the other satellite fields, are processed on the Gannet A platform. Processed oil is exported through an infield pipeline to the Fulmar installation and then via the Norpipe to Teesside. Gas is exported through the Fulmar gas pipeline to the SEGAL St Fergus Gas Processing Terminal.

Technical and Engineering Aspects

• The Gannet A platform, which processes the oil and gas from Gannet G and other fields, has facilities for gas injection and gas lift to enhance oil recovery. The platform is equipped with four production trains for both oil and gas processing, and it uses two 21-megawatt Rolls-Royce RB211 gas turbines for electricity generation.

Environmental and Maintenance Considerations

• While specific environmental details for the Gannet G field are not extensively documented, the overall Gannet complex has undergone various maintenance and upgrade projects, such as the re-insulation of the Gannet C field's flowline bundles to ensure continued production efficiency.

In summary, the Gannet G oil project is an integral part of the broader Gannet oil and gas field complex, managed by Shell and Esso, and contributes to the significant oil and gas production in the Central North Sea.