ABSTRACT
The term enhanced oil recovery (EOR) is used to describe various processes applied to increase hydrocarbon recovery from petroleum reservoir fields to a level above that of natural depletion. Injection of water, gas, and water alternating gas are the most commonly applied EOR techniques. For fields with a heavy and highly viscous oil, injection of steam or steam mixed with solvent (Expanding Solvent-Steam Assisted Gravity Drainage (ESSAGD)) can also be applicable.
