Table 5. Laboratory Test Results of Displacement Pressure Decreased by Surfactant System.
| core number | porosity (%) | permeability (10–3 μm2) | water flooding |
Bio Nano30 |
pressure at the end of subsequent water flooding (MPa) | injection pressure ratio before and after pressure drop | pressure drop value (%) | |||
|---|---|---|---|---|---|---|---|---|---|---|
| pore volume multiple | recovery ratio (%) | end pressure (MPa) | concentration (%) | interfacial tension (mN/m) | ||||||
| B1 | 20.0 | 22.0 | 2.87 | 35.0 | 2.20 | 0.1 | 10–3 | 1.45 | 1.98 | 50.5 |
| B2 | 20.1 | 20.0 | 3.56 | 34.5 | 2.60 | 0.1 | 1.68 | 2.12 | 52.8 | |
| A1 | 11.6 | 3.2 | 2.68 | 27.5 | 1.20 | 0.1 | 1.63 | 1.64 | 39.2 | |
| A2 | 11.5 | 3.8 | 2.70 | 26.1 | 2.70 | 0.1 | 1.63 | 1.66 | 39.6 | |