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324 Enhanced Oil Recovery in Shale and Tight Reservoirs
Figure 11.14 Alkaline concentration map in the middle layer at 90 days in the high-p c
sand model.
Figure 11.15 Alkaline concentration map in the middle layer at 90 days in the low-p c
shale model.
gradient is higher. The other one is that capillary pressure is higher. The
resultant higher capillary gradient drives more alkaline solution into
the matrix.
Note that 90 days of injection is modeled in such small cores. Upscaling
such small models to a field model will result in unrealistically long injection
time. For such a long time, capillary pressure has the mechanism in
