OPEC cut oil output in March by more than pledged under a supply reduction deal and said oil inventories had fallen in February, suggesting that its effort to clear a supply glut that has weighed on world oil prices is succeeding.
Oil rose towards $56 a barrel on Monday, supported by another shutdown at Libya's largest oilfield, tension over Syria following the U.S. missile strike and signs that an OPEC-led supply cut is helping to clear excess supplies.
Oil hit a one-month high near $55 a barrel on Wednesday as a fall in U.S. crude inventories raised hopes OPEC-led supply cuts were clearing a glut, while an outage at the largest UK North Sea oilfield lent support.
OPEC said on Tuesday oil inventories had continued to rise despite the start of a global deal to cut supply and raised its forecast of production in 2017 from outside the group, suggesting complications in the effort to clear a supply glut.
OPEC reported an increase in its oil production in October to a record high led by members hoping to be exempt from the producer group's attempt to curb supply, weighing on prices and pointing to a larger global surplus next year.
OPEC reported a increase in its oil production in September to the highest in at least eight years and raised its forecast for 2017 non-OPEC supply growth, pointing to a larger surplus next year despite the group's deal to cut output.