(Adds details, Exxon's production in 2018)
OSLO, Sept 6 (Reuters) - Oil major ExxonMobil said on Friday it had signed an exclusivity agreement with Var Energi for negotiations regarding a possible sale of Exxon's Norwegian upstream assets.
An acquisition of Exxon's production assets in Norway would cement Var Energi's position as the second largest petroleum producer in Norway after Equinor, excluding state-owned Petoro, which manages government stakes in offshore licenses.
Reuters reported on Sept. 5 that Exxon had agreed to sell its stakes in around 20 partner-operated fields, two years after selling its operated assets.
Exxon confirmed the exclusive talks to Reuters on Friday and said that a final sales agreement has yet to be signed.
In 2018, Exxon's net production from fields off Norway was 158,000 barrels of oil equivalents per day (boepd), data from the Norwegian Petroleum Directorate showed.
Var Energi, almost 70% owned by Eni, produced net 169,000 boepd from five operated and 14 partner-operated fields last year, the company has said.
Var, which was established last year by merging Eni's assets in Norway with Norwegian oil firm Point Resources, has previously said it aimed to boost its net output to 250,000 boepd in the early 2020s.
Exxon is also considering selling its assets in the British North Sea after more than 50 years, industry sources told Reuters last month.
The oil major has been focusing more in recent years to growing its onshore U.S. shale production, especially in the Permian basin, as well as developing large oil discoveries in Guyana. (Reporting by Nerijus Adomaitis, editing by Gwladys Fouche and Elaine Hardcastle)