MODELING OF LOW SALINITY EFFECTS IN SANDSTONE OIL ...
MODELING OF LOW SALINITY EFFECTS IN SANDSTONE OIL ... MODELING OF LOW SALINITY EFFECTS IN SANDSTONE OIL ...
24 OMEKEH, EVJE, AND FRIIS1Water Saturation1Water Saturation0.90.90.80.80.70.70.60.6Sw0.5Sw0.50.40.30.20.10.133days0.3330.6671.3332.0004.0006.0000.40.30.20.10.133days0.3330.6671.3332.0004.0006.00000 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1Dimensionless distance00 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1Dimensionless distanceFigure 16. Plots showing the water saturation s along the core, for differentinvading sea water brines, at different times during a time period of 6 days. Left:SW2. Right: SW.0.8Oil Recovery0.70.6oil recovery0.50.40.3SwSW1SW20.20.100 1 2 3 4 5 6Time (days)Figure 17. Oil recovery for different invading sea water brines. SW showingbetter recovery at early time after which SW2 performs better, due to a strongerrelease of Ca 2+ ions from the rock, which in turn contributes to a change ofwetting state.steady state of the β ca , β mg and β na is not reached for the duration of the example. Fig. 20 showsthe concentrations of the different ions along the core at various times. As a consequence of thelarge adsorption of Ca 2+ and Mg 2+ ions on the rock surface, there exists certain regions along thecore where the Ca 2+ and Mg 2+ concentrations are below the injected and initial concentrations.The Na + ions are desorbed from the rock surface and this desorption is responsible for the Na +concentration profile seen in Fig. 20. The Cl − acts as a tracer and is neither desorbed or adsorbed.
MODELING OF LOW SALINITY EFFECTS IN SANDSTONE OIL ROCKS 250.8Recoveryoil recovery0.60.40.2FWFW1FW200 1 2 3 4 5 6Time (days)Figure 18. Oil recovery for different formation brines and LSW as the invading brine.0.155BetaMg0.48BetaCa0.6BetaNa0.150.460.550.1450.440.50.140.420.450.1350.40.40.130.1250.120.1150.110.1050 0.5 1Dimensionless distance0.380.360.340.320.30 0.5 1Dimensionless distance0.350.30.250.20.150.10 0.5 1Dimensionless distanceInitial0.133days0.3330.6671.2002.0004.0006.000Figure 19. β-functions along the core for Example 3. Left: β mg . Middle: β ca .Right: β na .
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- Page 29 and 30: REFERENCES 2921. P.P. Jadhunandan a
- Page 31 and 32: REFERENCES 31The molecular diffusio
<strong>MODEL<strong>IN</strong>G</strong> <strong>OF</strong> <strong>LOW</strong> <strong>SAL<strong>IN</strong>ITY</strong> <strong>EFFECTS</strong> <strong>IN</strong> <strong>SANDSTONE</strong> <strong>OIL</strong> ROCKS 250.8Recoveryoil recovery0.60.40.2FWFW1FW200 1 2 3 4 5 6Time (days)Figure 18. Oil recovery for different formation brines and LSW as the invading brine.0.155BetaMg0.48BetaCa0.6BetaNa0.150.460.550.1450.440.50.140.420.450.1350.40.40.130.1250.120.1150.110.1050 0.5 1Dimensionless distance0.380.360.340.320.30 0.5 1Dimensionless distance0.350.30.250.20.150.10 0.5 1Dimensionless distanceInitial0.133days0.3330.6671.2002.0004.0006.000Figure 19. β-functions along the core for Example 3. Left: β mg . Middle: β ca .Right: β na .
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