Enhanced oil recovery techniques - petrofed.winwinho...

Gas Based EOR ProcessGas Injection is the second largest enhanced oil recoveryprocess, next only to thermal processes used in heavy oilfields. The residual oil saturations in gas swept zones havebeen found to be quite low, however, the volumetric sweepof the flood has always been a cause of concern. Themobility ratio, which controls the volumetric sweep,between the injected gas and displaced oil bank in gasprocesses, is typically highly unfavorable due to therelatively low viscosity of the injected phase. This differencemakes mobility and consequently flood profile control thebiggest concerns for the successful application of thisprocess.