On Thursday, BP was shutting one of two small crude distillation units for a planned overhaul at its 405,000 barrel per day (bpd) Whiting, Indiana refinery, according to sources familiar with the refinery's operations.
Supply concerns supported Brent after a report that North Sea oil output from the main British and Norwegian streams will fall by 6.6 percent in August from July due to seasonal maintenance. On Thursday, Shell Nigeria shut its Trans Niger pipeline due to a leak.
These factors outweighed concern about the demand outlook in China, while the prospect of growing non-OPEC supply offset lower inventories in the United States. Non-OPEC supply is set to grow at the fastest pace in decades next year, the International Energy Agency (IEA) said on Thursday.