Page 122 - Primer on Enhanced Oil Recovery

112 Primer on Enhanced Oil Recovery

Figure 10.16 Ternary diagram with different injection pressure.

Figure 10.17 Ternary diagram for immiscible injected gas oil combination.

Let us now consider the process of displacement under immiscibility conditions
(see Fig. 10.17). As can be seen from the figure in the process of displacing oil by
gas, the composition of the gas, although enriched, does not reach the composition
of the critical (single phase) composition. In this case, the increase in the volume of
oil does not occur, since the reservoir pressure does not exceed the saturation pres-
sure and the gas does not dissolve in the oil. In this regard, an increase in oil