Table 6
Comparison of the residual oil saturation computed from the ester and alcohol arrival times, according to equation (33), when using first- and second-order schemes and performing a grid refinement (see also Fig. 12). Expected residual oil saturation is
. Arrival times
,
and
are computed from the tracer, ester and alcohol outlet concentration profiles maximum peak amplitudes.
Scheme | n | S orw (−) | t t − t 0 (days) | t e − t 0 (days) | t a − t 0 (days) | t e − t a (days) |
---|---|---|---|---|---|---|
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1 | 0.138 | 1.64 | 1.51 | 0.84 | 0.67 |
2 | 0.160 | 1.69 | 1.62 | 0.83 | 0.79 | |
4 | 0.177 | 1.72 | 1.68 | 0.81 | 0.87 | |
8 | 0.172 | 1.73 | 1.71 | 0.84 | 0.87 | |
16 | 0.165 | 1.74 | 1.73 | 0.87 | 0.86 | |
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1 | 0.136 | 1.69 | 1.57 | 0.88 | 0.69 |
2 | 0.177 | 1.73 | 1.66 | 0.80 | 0.86 | |
4 | 0.189 | 1.75 | 1.71 | 0.79 | 0.92 | |
8 | 0.175 | 1.75 | 1.73 | 0.84 | 0.89 | |
16 | 0.159 | 1.76 | 1.73 | 0.89 | 0.84 | |
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1 | 0.132 | 1.86 | 1.64 | 0.93 | 0.71 |
2 | 0.172 | 1.83 | 1.69 | 0.83 | 0.86 | |
4 | 0.172 | 1.81 | 1.69 | 0.83 | 0.86 | |
8 | 0.140 | 1.72 | 1.65 | 0.91 | 0.74 | |
16 | 0.112 | 1.59 | 1.60 | 0.96 | 0.64 |