Investing.com - Oil was lower Friday as doubts emerged about the impact of agreed output cuts.
Brent crude shed 52 cents, or 0.93%, to $55.49 at 07:45 ET. U.S. crude lost 49 cents, or 0.92%, to $52.52.
Saudi Arabia has reportedly cut output to below 10 million barrels a day, more than agreed with other OPEC members in an accord reached at the end of November.
Kuwait has also reportedly reduced production by more than agreed in the November OPEC accord to trim output by 1.2 million barrels a day.
The focus is on compliance with non-OPEC producers who subsequently agreed an additional cut of 558,000 barrels a day.
Attention now turns to Baker Hughes U.S. rig count data due out later in the session.
Increased output by North American shale producers could undermine efforts to address a global supply glut.