Crude oil futures rebounded on Friday, with Brent heading for its biggest monthly gain since May 2009, as supply outages in the North Sea and renewed fears of gas supply disruption in Europe supported prices. A reduction in rig counts and expectations for better oil demand have helped Brent prices rise by around 15 percent so far this month from January’s close of $52.99. Brent crude (LCOc1) rose 98 cents to $61.03 a barrel by 0055 ET.