Comparison of CO 2 flow behavior in continuous CO 2 injection and in CO 2 -foam injection.

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... CO 2 and surfactant solution can be injected in an alternating pattern known as SAG injection. The advantages of surfactants reside mainly in the alleviation of viscous fingering, gravity segregation and early CO 2 breakthrough mostly by altering the magnitudes of viscous and gravity forces. We can depict these improvements as illustrated in Fig. 15, which implies that the mobility of CO 2 is reduced using foaming agents that improve the apparent viscosity and density of CO 2 . When CO 2 is trapped inside a surfactant solution, in the form of bubbles, it can be diverted to oil-rich zones of the reservoir where significant quantities of oil are bypassed in normal recovery phases. ...