US benchmark West Texas Intermediate for delivery in March hit USD 26.32 a barrel, close to a 13-year low of under USD 26.
Around 1730 IST, the contract stood at USD 26.38 a barrel, down USD 1.07 compared with yesterday's close.
Brent North Sea crude for April shed 67 cents to USD 30.17 a barrel.
"This irrefutable damage caused by the excessive oversupply in the saturated markets may have nullified any bullish reports concerning a decline in stockpiles," said Lukman Otunuga, research analyst at trading group FXTM.
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But they soon dropped back as traders took note of higher supplies of gasoline, a rise in stocks at the key Cushing, Oklahoma trading hub and a scant drop in oil production.
"Swollen crude inventories in the US are putting increased downward pressure on the price of WTI, increasing its differential to the international benchmark Brent," BMI Research said in a note to clients.
Analysts said sentiment was marred also by a report this week from the Organization of the Petroleum Exporting Countries that showed the cartel's production rose by about 130,000 barrels a day in January.
"With the fundamentals of an unrelenting oversupply still in place and the conflict of interest between OPEC members pumping record high levels... Low oil prices may be here to stay for an extended period," added Otunuga.