Using TOUGH ECO2N for Core flooding
Hi all,
I am curious to know if TOUGH2 is able to model a core flooding. Suppose that there is a core sample of length 30 CM.
I have tried, however my simulation didn't converge. I really appreciate it if anybody can share his/her experience in this regard.
Thank you,
Best regards
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As the model uses small gridblocks, it is normal to have small time step size. CO2 injection causes dry out near the wellbore and leads to salt precipitation. This could be real situation. You may play around with lower salinity, or lower injection rate. Co-injection with water could be an effective approach for preventing the dry out, but I am not sure.
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I agree with all Kenny's suggestions, and in addition you could try the following:
1. Different relative permeability function - liquid relative permeability krl controls how much water can flow toward the well and deposit its salt there when it evaporates. I think less mobile water (smaller van Genuchten m value, for example) will produce less salt precipitation. Weaker capillary pressure might accomplish the same thing (less pulling of liquid water toward the well).
2. Let intrinsic permeability be reduced as salt precipitation occurs (IE(11)>0). This will not solve your precipitation problem, but with permeability reduction, pressure will increase for a given injection rate. If pressure gets too big, you know that the injection rate you are using is not realistic.