Oil prices edged up in choppy trade on Tuesday as U.S. crude inventory data that was forecast to show a drawdown faced doubts about OPEC's ability to reduce a global glut.
Brent crude was up 55 cents at $52.15 a barrel by 2:34 p.m. ET (1834 GMT), after touching a four-week low of $51.30.
Meanwhile, U.S. crude futures settled 33 cents higher at $49.56 a barrel. At its lowest point of the day, the contract fell to $48.87, roughly in line with its 200-day moving average of $48.91.
Analysts polled ahead of inventory reports from the industry group American Petroleum Institute (API) and the U.S. Department of Energy's Energy Information Administration (EIA) estimated, on average, that U.S. crude stocks fell 1.6 million barrels last week, the third consecutive weekly draw.
The API data is due at 4:30 p.m. ET. The EIA report comes out Wednesday at 10:30 a.m. ET.