Research Article
Numerical Simulation of Microemulsion Flooding in Low-Permeability Reservoir
Table 1
The threshold pressure gradient of schemes in different surfactant concentrations.
| Scheme | Number of cores | Length (cm) | Diameter (cm) | Porosity (%) | Gas permeability (10−3 μm2) | Surfactant concentration (%) | Threshold pressure gradient (MPa/m) | | |
| 1 | Y1-11 | 5.02 | 2.50 | 12.16 | 3.98 | 0.0 | 0.0242 | 0.01802 | −0.00618 | 2 | Y1-13 | 4.97 | 2.50 | 12.23 | 4.04 | 1.0 | 0.0217 | 0.01668 | −0.00502 | 3 | Y1-14 | 4.96 | 2.51 | 12.14 | 4.06 | 1.5 | 0.0194 | 0.01509 | −0.00431 | 4 | Y1-15 | 5.01 | 2.50 | 12.23 | 4.01 | 2.0 | 0.0171 | 0.01352 | −0.00358 | 5 | Y1-17 | 5.02 | 2.50 | 12.30 | 4.03 | 2.5 | 0.0159 | 0.01306 | −0.00284 | 6 | Y1-18 | 4.98 | 2.51 | 12.12 | 3.96 | 3.0 | 0.0142 | 0.01263 | −0.00217 |
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