Oil prices steadied on Monday after data showing a sharp drop in Saudi Arabia's crude oil exports balanced signs of rising refined products stocks.
Brent crude for September was 5 cents up at $57.15 a barrel by 0825 GMT. The benchmark fell nearly 3 per cent last week and is down more than 10 per cent so far this month.
US crude futures for August, also known as West Texas Intermediate (WTI), were up 5 cents at $50.94 a barrel. The August contract expires on Tuesday.
Oil prices have fallen for three weeks in a row on expectations of increased exports from Iran following a deal to ease sanctions against the OPEC producer.
Investors are worried that a big oversupply of crude in many markets, that has been filling inventories towards record levels, will be exacerbated by more oil from Iran.
But not all industry data are bearish.
Saudi Arabia's crude oil exports fell in May to their lowest since December, with official data showing daily shipments stood at 6.935 million barrels a day (bpd) compared with 7.737 million bpd in April, despite record high output of over 10 million bpd as the Kingdom.
As refineries around the world continue to operate at near maximum levels to benefit from strong profit margins, there are signs a glut in the crude oil market may be shifting to refined products.
"We are seeing the crude surplus moving into the oil products with elevated inventories in Europe for gasoline, naphtha and especially gasoil," Bjarne Schieldrop, chief commodity analyst at Oslo-based SEB.
Strong increases in refinery operations in recent months are set to slow in the second half of this year, Vienna-based consultancy JBC Energy said:
"We expect global crude runs to be in the process of peaking for this year."
In the United States, drillers cut seven oil rigs last week following two weeks of increases, according to a closely watched report by Baker Hughes Inc.
"At current prices, shale is supremely challenged and demand could pose an upside surprise," Barclays said in a note to clients.
Russian Energy Minister Alexander Novak said he will meet OPEC Secretary-General Abdullah al-Badri in Moscow on July 30 to discuss oil markets and the Iran situation.