New York's West Texas Intermediate (WTI) for delivery in June was up USD 1 at USD 44.78 per barrel.
European benchmark Brent crude for July delivery jumped 82 cents to USD 45.44 compared with yesterday's close.
"Oil prices are rising today after three consecutive lower closes," said analyst David Cheetham at London-based brokerage XTB.
"Firstly, a huge wildfire - which has forced the evacuation of 88,000 people in the western Canadian oil city of Fort McMurray - has seen some pipelines in the region being shut and disruptions to output at several facilities," Cheetham told AFP.
Cheetham added: "In the grand scheme of things both these developments are unlikely to be significant driving factors for the market going forward, but the timing coinciding with some short term oversold conditions has seen the price move higher so far today."
Authorities say wildfires are burning out of control in the Alberta oil sands region of Canada, which mines and ships heavy crude to the US, and oil companies have reduced operations as non-essential employees are evacuated.
News of the Canada fires came as official data showed that US oil output sank last week by more than 100,000 barrels a day to 8.83 million, its lowest level since September 2014.
While US commercial crude oil inventories rose in the same week, investors focused more on hopes the production decline would help ease a global supply glut.
"US oil production at its lowest in eight months, as well as a wildfire limiting Canadian output, have buoyed prices," added CMC Markets analyst Jasper Lawler today.
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