Iraq and Kazakhstan, during a meeting of an OPEC+ panel on Thursday, pledged to comply better with oil cuts, sources said. This means curbs by the Organization of Petroleum Exporting Countries and allies, known as OPEC+, could deepen in July.
"There is enthusiasm in the market that oil supply is still under control," said Paola Rodriguez Masiu, analyst at Rystad Energy. "A positive OPEC+ meeting does that and yesterday's session helped renew confidence."
Brent crude rose $1.03, or 2.5%, to $42.54 by 0945 GMT, the highest since June 8. US West Texas Intermediate (WTI) crude climbed $1.17, or 3%, to $40.01.
"The key takeaway is that OPEC+ compliance will improve in the coming months," said Stephen Brennock of broker PVM. Both contracts rose about 2% on Thursday and are heading for weekly gains of more than 9%.
Brent has more than doubled since hitting a 21-year low in April, helped by record OPEC+ supply cuts of 9.7 million barrels per day (bpd), or 10% of world demand, and an easing of government lockdowns imposed to control the coronavirus.
Fuel demand in Europe is staging a gradual recovery after the height of the lockdowns in April but remains well below normal, data from several countries shows.
In a further sign of market recovery, Brent on Thursday moved into backwardation, where oil for immediate delivery costs more than supply later, for the first time since March.
A premium for oil for immediate delivery usually indicates tightening supply and encourages storage to be drawn down. US crude stocks hit another record this week, but fuel inventories fell.