The oilfield produces 90,000 barrels a day (bpd) of crude. Protesters chanted "no homeland, no oil," as they forced its closure, the sources said.
Mass protests have gripped Iraq since Oct. 1 and protesters, most of them young, are demanding an overhaul of a political system they see as profoundly corrupt and keeping most Iraqis in poverty. More than 450 people have been killed.