Oil price gains eased after jumping as much as 3 percent on Thursday, as a raging wildfire near Canada's oil sands region and escalating Libyan violence raised worries about immediate oil supplies.
The wildfire near Fort McMurray in Alberta, Canada, has grown five times its initial size and spread south on Thursday, forcing more evacuations after 88,000 people fled the city in the nation's energy heartland since Tuesday. Some pipelines in the region have been shut as a precaution and output at several facilities were disrupted, though affected volumes were unclear.
In Libya, the state's already crippled oil production was at further risk from a stand-off between eastern and western political factions that prevented a Glencore cargo from loading.
Brent crude futures rose 41 cents, or 0.9 percent, on the day to $45.03 a barrel, after soaring more than $2 earlier to $46.77.
U.S. West Texas Intermediate (WTI) futures settled 54 cents higher, or 1.2 percent, at $44.32, after rallying to $46.07 earlier.