Brent for July settlement rose 7 cents to $50.84 a barrel on the London-based ICE Futures Europe exchange. Prices increased 3.5 percent this week. The global benchmark crude closed at a $2.67 premium to July WTI.
US supplies declined by 5.25 million barrels to 522.5 million last week, Energy Information Administration data showed Wednesday. While that's down from a record 535.5 million barrels at the end of March, output rose for a 12th week to 9.3 million barrels a day, the highest since August 2015.
OPEC and its allies support extending the curbs for a further six months, Iraq's Jabbar Al-Luaibi and Algeria's Noureddine Boutarfa said Thursday in Baghdad. The two biggest producers participating in the curbs, OPEC's Saudi Arabia and non-member Russia, both signaled willingness on May 8 to prolong the deal.
In other oil-market news:
• US drillers have dramatically reduced their hedging activity, a move that could portend a break in the production gains that have upended global crude prices.
• Saudi Arabia and Equatorial Guinea agree on extending oil output reduction deal for at least 6 months. The Saudis also support Equatorial Guinea in joining OPEC, according to Saudi Press Agency.
• In OPEC's battle to revive the global oil market, the group and its allies are digging in for a long war of attrition against shale. US output will be approaching the 9.5 million barrels a day mark by the time OPEC meets in Vienna later this month.