Iran's oil minister has asked for support against the sanctions and signaled his government disagrees with Saudi Arabia's views on the possible need to increase global oil supplies; the two issues could set up a contentious meeting.
Brent was up 45 cents a barrel at $75.83 by 1015 GMT.
In North America, however, surging U.S. output has pressured WTI crude futures.
"The continuing increase in crude oil production is weighing on the market, and quite significantly compared to this time past year", Andrew Lipow, president of Houston-based Lipow Oil Associates.
Brent was down 40 cents a barrel at $74.97 by 11:42 a.m. US light crude was down 73 cents at $64.79, after touching a session low of $64.27 a barrel.
One of the key features of oil markets recently has been the widening discount of US WTI crude versus Brent CL-LCO1=R , which has nearly quadrupled since February to $11.40 per barrel, its steepest discount since 2015.
Global benchmark Brent crude surged almost $2 a barrel on Thursday, lifted by concern about a steep drop in exports from Venezuela and worries OPEC may not raise production at its meeting this month.
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The group meets in Vienna on June 22 to discuss its supply policy.
Oil prices climbed on Wednesday after Venezuela raised the prospect of a halt to some crude exports, but gains were capped by reports that the USA government had asked Saudi Arabia and some other producers to increase output.
The producers have been considering a supply increase of up to 1 million barrels per day, sources told Reuters.
OUT OF SYNC Despite this, oil markets are not unanimously bullish.
Three sources have told Reuters that Venezuelan state firm PDVSA is considering declaring force majeure on some exports, amid plummeting output and tanker bottlenecks at ports.
"This is occurring because of the rapid increase in production from U.S. shale coupled with the tightening of supplies elsewhere through the actions of Opec and Russian Federation", said William O'Loughlin, investment analyst at Australia's Rivkin Securities.
"OPEC will not bow and obey" to US pressure to increase oil production, said Hossein Kazempour Ardebili, one of Iran's representatives to the organization. "$80 is a temporary ceiling for oil until we hear from OPEC".