Oil prices have been rising since the OPEC nations, as well as other producers including Russia, decided to restrict output last year.
Last November they agreed to extend those cuts until the end of 2018.
President Donald Trump has said that unless European allies fix what he has called “terrible flaws” in the accord by May 12, he will restore US economic sanctions on Iran.
The other nations that signed the deal – France, Germany, the UK, Russia and China – all want to keep in place the agreement, which has halted Iran’s nuclear program in return for most international sanctions being lifted.
Oil prices have fallen further after the International Energy Agency (IEA) forecast weaker demand in 2015.
The IEA, a consultancy to 29 countries, said supply and demand would take “some time” to respond to sharp falls in oil prices.
It said it was too early to expect low oil prices to start constricting a US supply boom.
On December, Brent crude fell to below $63 a barrel, its lowest price since July 2009.
The price of Brent fell to $62.50 a barrel at one point before recovering slightly to $62.67. US crude was trading below $59 a barrel.
The IEA cut its forecast for global oil demand growth next year by 230,000 barrels per day to 900,000 barrels per day on the expectation of lower fuel consumption in Russia and other oil-exporting countries.
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Oil prices have been in steep decline since June due to slow demand growth and a US shale oil boom which has increased supply.
Prices “continued to plunge in November and into early December”, the IEA said, adding that, “it may well take some time for supply and demand to respond to the price rout”.
The root cause of the fall in prices was “a surge in non‐OPEC supply to its highest growth ever and contraction in demand growth to five‐year lows”.
It predicted that non-OPEC supply gains would add to a global glut of oil.
The US boom should push non-OPEC production to a record 1.9 million barrels per day this year, IEA said, but this figure should fall to 1.3 million barrels per day in 2015.
In Russia, the IEA said lower global oil prices combined with the effect of sanctions and a “collapsing currency” were likely to have an adverse effect on production.
Crude oil prices have reached a four-year low after Saudi Arabia unexpectedly cut the price of oil sold to the US.
Brent crude fell to near $82 a barrel as worries about global growth also spooked investors.
Earlier, the European Commission reduced its growth forecasts for the eurozone.
Investors are concerned about the US oil industry in the face of slowing growth and lower prices.
Crude oil prices have reached a four-year low after Saudi Arabia unexpectedly cut the price of oil sold to the US
Some worry that low oil prices could hurt domestic US producers dependent on high prices for profitability.
The price cut also sent shares in many energy firms lower, pushing down all three US share indexes.
Surging revenues from the US oil boom have led to calls on the government to remove regulations restricting the sale of US crude oil abroad.
In the interim, the growth in domestic oil production has helped the US trade deficit, as the US has become less dependent on importing foreign oil.
Separately on November 4, the Commerce Department’s latest release showed that the US trade deficit unexpectedly widened in September as exports hit a five-month low, mostly due to economic weakness in Europe.
The Commerce Department said the trade gap increased by 7.6% to $43.03 billion, as China and eurozone orders decrease and the strength of the US dollar hurt exports.