International Benchmark Brent crude fell to $64.69 per barrel while American benchmark West Texas Intermediate WTI saw $61.62 at 09.40 GMT+3 on Thursday.
On Monday, Brent crude traded at $67.19 per barrel while WTI saw $63.78 at 06.40 GMT.
The U.S. Energy Information Administration (EIA) announced on Wednesday that crude oil inventories in the country increased last week.
Commercial crude oil stocks rose by 3 million barrels to reach 423.5 million barrels for the week ending Feb. 23, the EIA data showed.
After the data released, Brent crude fell to as low as $64.50 per barrel on Wednesday while WTI declined to $61.37 a barrel for a daily loss of more than 2 percent.
The U.S.' crude oil production rose 13,000 barrels per day (bpd) to reach 10.28 million bpd for the week ending Feb. 23, the EIA said.
By Gulsen Cagatay
Anadolu Agency
energy@aa.com.tr