ICD
ICD is an abbreviation for 'Inflow Control Device'. In a lateral where multiple zones are open, it is possible for a high pressure zone to overpower the production flow with very little contribution from low pressure formation. This could deplete the high pressure zone faster and can result in water or gas breakthrough in the well. ICDs are used to balance the hydrocarbon flow from different formations thus helping reservoir and production optimization. In injector wells, ICDs are also used to balance injection pressure across different zones thus improving the production and recovery.