Oil production at Eni's Arctic Goliat field off the coast of Norway was shut on Monday for planned maintenance, a company spokeswoman told Reuters.
The outage is expected to last for about 10 days, she added.
Goliat, the world's northernmost producing oilfield, has a capacity of close to 100,000 barrels of crude per day.
(Reporting by Terje Solsvik, editing by Camilla Knudsen)