LONDON: Oil prices slipped on Thursday as swelling US crude inventories and record weekly US production clashed with OPEC supply cuts and the potential for new US sanctions against Iran.
Brent crude oil futures were at $72.91 per barrel at 1113 GMT, 45 cents below their last close.
US West Texas Intermediate (WTI) crude futures were 10 cents lower at $67.83 per barrel.
Prices have seesawed, edging lower during Asian trading hours, then higher at the start of the day in Europe, as the market grappled with conflicting fundamental signals.
On Wednesday, a report from the US Energy Information Administration (EIA) showed a 6.2-million-barrel jump in US crude inventories <C-STK-T-EIA>.
But bullish factors, including an increase in Saudi Arabia's official oil selling price to Asia, also underpinned prices, according to Commerzbank analyst Carsten Fritsch.
"It may signal stronger-than-expected demand in Asia," Fritsch said. "This, combined with constraints in (OPEC) production, could lead to higher prices."
State-owned producer Saudi Aramco on Wednesday raised the June price for its Arab Light grade for Asian customers to a premium of $1.90 a barrel to the Oman/Dubai average, the highest since August 2014.
Additionally, the latest Reuters survey of OPEC production showed it pumped around 32 million barrels per day (bpd) in April, slightly below its target of 32.5 million bpd, due largely to plunging output in Venezuela.
Fritsch said the cuts, along with demand growth, were more than offsetting the increase in US oil.
US oil production rose to a record of 10.62 million bpd, putting it ahead of Saudi Arabia, the biggest OPEC producer.
Only Russia pumps more, at around 11 million bpd.
US drilling for new production is also increasing, encouraged by rising prices following OPEC's production curbs.
The May 12 deadline for US President Donald Trump to decide whether to continue waiving US sanctions against Iran was also buffeting downward pressure on prices.
"Overall, we continue to trade a waiting game for the US decision on Iran, waiting to have sanction headlines trigger some frenzied buying," said Olivier Jakob, managing director of energy consultancy PetroMatrix.
Trump has all but decided to withdraw from the 2015 Iran nuclear accord by May 12, sources said, though exactly how he will do so remains unclear.
Iran re-emerged as a major oil exporter in January 2016 when international sanctions against Tehran were suspended in return for curbs on Iran's nuclear programme.
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