Figure 10.10. The mobility of CO
foams in three Berea sandstone cores as a function of foam
2
quality (B, C, D permeability values of 196, 139, and 62 mD, respectively) [Chang and Grigg,
1999].
Moradi-Araghi and co-workers [Moradi-Araghi et al., 1997] also found that the greatest mobility
reduction, or highest resistance factor, occurred with foams of 50%–70% quality as shown in
Figures 10.11 to 10.13.
Figure 10.11. Resistance factor vs. foam quality in various South Cowden reservoir cores at reservoir
o
conditions of 98
F and 2,000 psi using the NES 25 surfactant [Moradi-Araghi et al., 1997]
87