Research Article

Numerical Simulation of Microemulsion Flooding in Low-Permeability Reservoir

Table 1

The threshold pressure gradient of schemes in different surfactant concentrations.

SchemeNumber of coresLength (cm)Diameter (cm)Porosity (%)Gas permeability (10−3μm2)Surfactant concentration (%)Threshold pressure gradient (MPa/m)

1Y1-115.022.5012.163.980.00.02420.01802−0.00618
2Y1-134.972.5012.234.041.00.02170.01668−0.00502
3Y1-144.962.5112.144.061.50.01940.01509−0.00431
4Y1-155.012.5012.234.012.00.01710.01352−0.00358
5Y1-175.022.5012.304.032.50.01590.01306−0.00284
6Y1-184.982.5112.123.963.00.01420.01263−0.00217