Crude oil prices fell on Friday as a stronger dollar weighed on the market and an industry report showed U.S. oil drillers continue to ramp up activity with prices holding above $50 a barrel.
Global benchmark Brent crude fell 6 cents to $51.97 by 2:38 p.m. ET (1838 GMT), having risen as high as $52.55 earlier in the session.
U.S. crude settled down 9 cents at $50.35 a barrel, closing the week up 1.1 percent.
Prices were little changed after Baker Hughes reported U.S. drillers added four oil rigs in the last week, marking the 15th increase in 16 weeks. The total number of oil rigs operating in U.S. fields stood at 432, compared with 595 at this time last year.