Brent crude futures fell 45 cents, or 0.8%, to $55.65 a barrel, erasing a 2 cent gain on Thursday.
Oil prices dropped on Friday, retreating further from 11-month highs hit last week, weighed down by worries that new pandemic restrictions in China will curb fuel demand in the world's biggest oil importer.
U.S. West Texas Intermediate (WTI) crude futures dropped 53 cents, or 1%, to $52.60 a barrel at 0445 GMT, after slipping 18 cents on Thursday, as reported by Reuters.
Brent crude futures fell 45 cents, or 0.8%, to $55.65 a barrel, erasing a 2 cent gain on Thursday.
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The market is awaiting official oil inventory data from the U.S. Energy Information Administration on Friday, after industry data on Wednesday showed a surprise 2.6 million barrel increase in U.S. crude inventories last week compared with analysts' forecasts for a 1.2 million barrel draw.