Oil prices have fallen by a third since the start of October, when it hit a four-year high above $87. It is set for its biggest quarterly slide since the fourth quarter of 2014.
The market also shrugged off government data that showed U.S. crude stockpiles fell 1.2 million barrels last week, a much smaller drawdown than the 10 million-barrel decline reported by industry group the American Petroleum Institute and less than half the draw of 3 million barrels analysts had forecast.
"The divergence from the large inventory decline reported by the API makes the report appear more negative than it actually was," said John Kilduff, a partner at Again Capital Management in New York.
Concerns about global oversupply of crude, driven largely by U.S. output from shale formations has driven the market lower in recent weeks, and prompted OPEC and some non-OPEC producers including Russia to cut supply by 1.2 million barrels per day (bpd) for six months from Jan. 1.
"The OPEC+ deal from last week will allow more of a bullish position to be taken up by some market participants from this point," analysts at JBC Energy said in a report.
"The crude picture at least looks somewhat firmer for the next six months than it did previously."