Enhanced oil recovery techniques - petrofed.winwinho...

Gas Based EOR ProcessTapering is the decrease in gas-toto-water ratio as the floodprogresses. This is generally done to control the gas mobility and achanneling as well as to prevent early breakthrough of the gas. Thisstep is important especially when the injected gas is expensiveand needs recycling. Tapering is generally done in most of the CO2 Cand hydrocarbon floods and prevailed even in the earliest WAGflood trials.