Development

Dvalin is a field in the central part of the Norwegian Sea, 15 kilometres northwest of the Heidrun field. It consists of three separate structures: Dvalin East, West and North that were proven in 2010, 2012 and 2021, respectively. The water depth is between 340 and 400 metres. The plan for development and production (PDO) of the East and West structures was approved in 2017. The development concept is a subsea template with four production wells tied-back to the Heidrun platform. The production started in 2020. The PDO for Dvalin North was approved in June 2023, and includes a subsea template with three production wells.

Reservoir

Dvalin contains gas in Middle Jurassic sandstone in the Ile and Garn Formations. The reservoirs lie at a depth of 4,500 metres and have high pressure and high temperature (HPHT). The homogeneous shallow marine Garn sandstone has good reservoir quality, while the more heterogeneous and fine-grained Ile sandstone has less favourable reservoir properties.

Recovery strategy

The field is produced by pressure depletion.

Transport

The well stream is transported via pipeline to Heidrun for processing at a dedicated gas processing module. The gas is then transported via Polarled to Nyhamna for further processing before being exported as dry gas via Gassled to the market.

Status

The production from Dvalin, which was put on hold due to high mercury content, started again in July 2023 after a mercury removal solution for the export gas was installed at Nyhamna.