LONDON: Brent crude futures eased on Wednesday, surrendering early gains after evidence of further increases in US shale supply and a rise in Iranian exports ahead of a possible renewal of US sanctions on Tehran.
July Brent futures were down 16 cents at $72.97 a barrel by 1100 GMT, after falling nearly 3 percent on Tuesday to their lowest in two weeks.
US West Texas Intermediate crude futures were up 18 cents at $67.43, off a session high of $67.85.
"Geopolitical noise remains loud and in part pushed oil prices towards $75 per barrel," said Norbert Ruecker, head of commodity and macro strategy at Julius Baer.
"The elevated uncertainty suggests volatile but range-bound oil prices going forward."
Iran, a member of the Organization of the Petroleum Exporting Countries, re-emerged as a major oil exporter in January 2016 when some international sanctions against Tehran were lifted in return for curbs on Iran's nuclear programme.
The United States has questioned Iran's sincerity in implementing the nuclear curbs and President Donald Trump has threatened to reimpose sanctions if adjustments are not made to the agreement.
Iran's oil exports hit 2.6 million barrels per day (bpd) in April, according to the Oil Ministry, a record since the lifting of sanctions. China and India bought more than half of the oil.
"The expectation that the US will leave the sanctions waivers is leading Iran to sell as much as it can," Petromatrix strategist Olivier Jakob said.
Trump will decide by May 12 whether to restore US sanctions on Iran, which would likely reduce its oil exports.
"If Trump abandons the deal, he risks a spike in global oil prices," said Ole Hansen, head of commodity strategy at Saxo Bank, adding that reintroducing US sanctions could remove 300,000-500,000 bpd of Iranian oil from global supplies.
However, the rising value of the dollar since mid-April and soaring US supplies have helped check further oil price gains, traders said.
US crude inventories rose by 3.4 million barrels to 432.575 million in the week to March 27, according to a report by the American Petroleum Institute on Tuesday.
"An inventory build similar to what the API showed could put some further downward pressure on the market," ING said in a note.
Rising inventories are partly due to soaring US production, which jumped by a quarter in the last two years to 10.6 million bpd.
The United States has overtaken Saudi Arabia to become the world's second-biggest crude producer after Russia.
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