Oil prices declined on Tuesday for the fifth consecutive session ahead of key US inventory data.
A Reuters survey revealed that OPEC's oil output increased by 145,000 bpd in May to 26.63 million bpd, with production rises in Nigeria and Iraq offsetting voluntary cuts by Saudi Arabia and other nations.
The US Energy Information Administration is set to release official data on US crude stocks tomorrow, which is expected to show a reduction of 2.1 million barrels last week.
On trading, Brent August futures dropped 1%, or 84 cents, to $77.52 a barrel.
US crude futures for July delivery fell 1.3%, or 97 cents, to $73.25 a barrel.
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