Oil prices were on track to a weekly loss as potentially higher Iraqi crude exports and bearish U.S. inventory data weighed on the market.
Also on Friday, the number of rigs operating in the United States rose for a fourth consecutive week, increasing by 14 to a total of 371 rigs, oilfield services firm Baker Hughes reported.
While many expect global oversupply of oil to ease in the near term, huge amounts of crude remain in vessels at sea and storage tanks on land as the rebalancing takes longer than some had anticipated.
Brent crude was down 54 cents, or 1.17 percent, at $45.66. It fell as low as $45.26 earlier, the lowest since May 11. The contract was on pace for a weekly loss of nearly 5 percent.
U.S. West Texas Intermediate (WTI) settled down 56 cents, or 1.25 percent, at $44.19 a barrel, and last fell 57 cents, or 1.27 percent, to $44.18.