Kobra East and Gekko are two oil and gas fields located in the northern part of the North Sea on the Norwegian shelf. The plan for these fields calls for a tieback to the production and storage vessel on Alvheim, the Alvheim FPSO.
Alvheim is located in the central part of the North Sea, ten kilometres west of Heimdal and close to the UK sector border. The KEG discoveries are located about 10 km southeast of the Alvheim FPSO.
Gekko was discovered by Elf Petroleum as early as 1974, in the drilling of well 25/4-3. Knowledge about the discovery has been increased through multiple subsequent appraisal wells, most recently in 2018.
Kobra East was discovered in 2016, through the extension of a production well on Kobra. Both discoveries are located in production licence 203, the same as the Alvheim field (Aker BP ASA (operator), 80%, ConocoPhillips Skandinavia AS, 20%).
The reservoir is Heimdal Fm, a high-quality turbidite reservoir similar to the reservoir developed on the Alvheim field (discoveries from Boa, Kameleon and Kneler). Gekko consists of two four-way closures, Gekko North and Gekko South, with communication in the oil and water zone between the structures. The Gekko structures have a thin oil column (6-7 m) with overlying gas caps. The Kobra East discovery was made through the extension of well 24/9-P-8 AY1H in 2016 (Kobra production well), which found undersaturated oil in an injected sandstone reservoir. This is the same reservoir (Hermod Fm) and same liquid as in the nearby producing fields Viper and Kobra.
The development concept is a subsea development tied back to existing infrastructure on Kneler B, which constitutes part of the Alvheim field.
The project will be developed in two phases, where the drainage strategy for the first phase is four oil producers, each with three laterals, drilled from two seabed locations (four km apart). Two of the Gekko wells will be converted to produce gas via a new sidetrack in the second phase.