Oil trade continued the decline following the prospect of additional supplies from Iran returning to the market to overcome concerns about a possible Russian attack on Ukraine.
In Asia, Brent crude fronts traded at $92.40 a barrel, following a 1.9% drop from the previous session. US WTI was also trading at $91 a barrel after losing 2% in Thursday's trading session.
Both level-marking contracts are on course for their first weekly falls in nine weeks after hitting their highest levels since September 2014 earlier in the week.
Negotiators from Iran, Russia, China, Britain, France, Germany, the European Union and the United States are still negotiating a draft agreement that would lead to an exception to the oil barrier.
Roughly 1 million barrels a day of oil from Tehran will return to the market if an agreement is reached.
Meanwhile, uncertainty regarding the geopolitical issues of Russia and Ukraine still haunts the market and provides support for crude oil trading to continue to hold above the price level of $90 a barrel.
