Oil prices have fallen, since it has risen after Thursday's trading The Energy Information Directorate (EIA) has shown that US stocks last week increased by 10.3 million barrels, while stocks of gasoline fell by 1.4 million barrels.
While US oil production continued to climb to the record last week, it reached 11.7 million barrels a day.
Crude prices rose by more than 1% in OPEC's trademarking to reduce production by 1.4 million barrels next year.
At the settlement, NYMEX crude oil rose by 0.4% to $ 56.46 a barrel for December delivery, after having initially raised $ 57.26 per barrel.
By 19.44 GMT, the futures contract increased by 0.7% to $ 66.60 per barrel.