Oselvar () is a since April 2018 abandoned subsea oil field located southwest of Stavanger in the southern Norwegian section of the North Sea, close to the British border. Oselvar was discovered in 1991. The field is located at distance from the Ula field to which it was tied back. The original estimated reserves at Oselvar were 38 million barrels of oil and of natural gas. The water depth at location is . The Oselvar field installations shall be decommissioned by the end of 2022.
Ownership
DNO Norge AS is since 2019 the formal operator of the field with 55% of interest in the project. Production License 274 which covers the area of the field was given in 2002 to then operator DONG. As per 2020 the only other partner is CapeOmega AS (45%). The total development cost was NOK 4.7 billion. </ref>
Production
Oselvar was developed with three production wells. Produced oil and gas was transported to the Ula field platform for processing via the Oselvar module. Once processed, the oil was pumped via the Norpipe system to Teesside, UK. Although production was scheduled to start in November 2011, production actually started on April 14, 2012.