Scale up of surfactant alternating gas foam processes

Foam increases sweep efficiency during gas injection in enhanced oil recovery (EOR)
processes by reducing gas mobility. In fact, foam is the only EOR technology that is
able to fight against both gravity segregation and geological heterogeneity. Surfactant Alternating Gas, or SAG, is the preferred method to place foam into the reservoir for both operational and injectivity reasons. For example, this method of injection avoids the difficulties of having foam in the injection lines. Injecting foam in this manner also offers better injectivity than in foam-injection processes in which pregenerated foam is injected into the reservoir.