Development

Heidrun is a field on Haltenbanken in the Norwegian Sea, 30 kilometres northeast of the Åsgard field. The water depth is 350 metres. Heidrun was discovered in 1985, and the plan for development and operation (PDO) was approved in 1991. The field has been developed with the world's first ever floating concrete tension-leg platform (TLP), installed over a large subsea template with 56 well slots. Six subsea templates in the southern and northern areas are additionally tied-back to the TLP. Production started in 1995. The floating storage unit (FSU) Heidrun B is permanently moored at the Heidrun platform since 2015. The PDO for the Heidrun northern flank was approved in 2000. The Maria field receives water for injection from Heidrun. The Dvalin field has a dedicated gas processing plant on the Heidrun platform.

Reservoir

Heidrun produces oil and gas from Lower and Middle Jurassic sandstone in the Åre, Tilje, Ile and Garn Formations. The reservoir lies at a depth of 2,300 metres and is heavily faulted and segmented. The Ile and Garn Formations have good reservoir quality, while the Åre and Tilje Formations are more complex.

Recovery strategy

The field is produced with pressure maintenance using water and gas injection in the Ile and Garn Formations. In the more complex parts of the reservoir, in the Åre and Tilje Formations, the main recovery strategy is water injection. Some segments are also produced by pressure depletion.

Transport

The oil is exported via the Heidrun B FSU onto tankers and shipped to the market. The gas is transported by pipeline to the terminal at Tjeldbergodden and/or via the Åsgard Transport System (ÅTS) to the Kårstø terminal. The Dvalin gas is transported by pipeline via Polarled to the Nyhamna terminal.

Status

Production from Heidrun is maintained at a relatively high level through continuous water and gas injection and drilling of new production and injection wells. Several methods are being evaluated to improve recovery and prolong the lifetime of the field, including infill wells, new drilling technology and methods for enhanced oil recovery (EOR). Production from the Alpha Horst segment started in 2022.