Gradient barrier in a secondary recovery operation to inhibit water coning

摘要: The advance of the interface between subterranean hydrocarbon bearing formation fluids containing hydrocarbons and an underlying aquifer in a secondary recovery operation as it advances toward production perforations well bore to result water coning during is delayed by imposition reciculating barrier extraneous fluid, such produced fluid hydrocarbons, injected into via intermediate injection (lower) (upper) bore, recirculation providing gradient barrier.