International benchmark Brent crude decreased to $66.50 while American benchmark West Texas Intermediate (WTI) saw prices at $60.17 at 11.40 GMT on Friday.
Brent crude oil price soared a little over $67 on Tuesday for the first time since May 2015, pushed upwards by the supply disruption following an attack on the Libya's Es-Sider oil pipeline.
According to the Libyan National Oil Company’s statement, the explosion blocked the transport of between 70 thousand and 100 thousand barrels per day.
After the attack, Brent crude oil prices started trading at $66.25 Wednesday and currently it is around $66.50 per barrel on Friday at 11.40 GMT.
Despite the tight supply in Libya, Forties pipeline, one of the major oil pipelines in the North Sea, started pumping oil in lower quantities.
In the meantime, Energy Information Administration (EIA) said on Thursday that crude oil production decreased 35 thousand barrels and reached to 9.75 million barrels per day.
By Gulsen Cagatay