Wedoany.com Report, Norwegian energy company Equinor plans to tie back its latest oil and gas discovery in the Barents Sea to the Johan Castberg floating production, storage, and offloading (FPSO) facility. On March 18, the company announced that drilling at the Polynya Tubåen prospect encountered recoverable reserves of approximately 14 to 24 million barrels of oil equivalent.

Grete Birgitte Haaland, Director of Equinor's Northern Exploration and Production Area, stated in a press release: "We plan to drill one to two exploration wells annually in this area in the future to increase the resource base and maintain stable production over a longer period." The Johan Castberg field's initial resource base was estimated at 500 to 700 million barrels, and Equinor aims to add a further 200 to 500 million barrels.

According to the Norwegian Offshore Directorate (NOD), the COSL Prospector drilled well 7220/7-5 at the Polynya Tubåen prospect in a water depth of 361 meters, located about 16 kilometers southwest of the Johan Castberg discovery well. This well is the 17th exploration well in production license 532, aimed at testing for oil in Lower Jurassic reservoir rocks of the Tubåen Formation. Drilling results encountered a 26-meter gas column and a 26-meter oil column within 39 meters of reservoir-quality rock, with a total thickness of 125 meters. The gas/oil contact is located 972 meters below sea level, and the oil/water contact is at a depth of 998 meters.

The well was not formation-tested, but extensive data and samples were collected. Equinor also revealed that work has begun last week to tie back the Isflak project to the Johan Castberg FPSO, which came on stream in March 2025 and reached peak production in June 2025. For Iskflak, Aker Solutions has begun constructing wellheads for two new wells, which will be connected to existing subsea facilities. Equinor operates the Johan Castberg field with a 46.3% interest, with partners Vår Energi and Petoro holding 30% and 23.7%, respectively.