NOC said it was conducting a full-scale investigation into suspected closed valves in the Hamada area It also said in a statement that production from El Feel oilfield was unaffected by the incident LONDON: Libya’s National Oil Corporation confirmed on Saturday that production at its 290,000 barrels per day El Sharara oilfield was currently offline. NOC said it was conducting a full-scale investigation into suspected closed valves in the Hamada area. It also said in a statement that production from El Feel oilfield was unaffected by the incident. Sources earlier told Reuters that production at El Sharara had halted on Friday due to a valve closure on the pipeline linking the field to Zawiya.