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| Factor | BS solution (ppm) | ||
|---|---|---|---|
| 50 | 80 | 120 | |
| Initial contact angle (°) | 119 | 112 | 106 |
| Final contact angle (°) | 21 | 15 | 7 |
| Contact angle change (%) | 82.3 | 86.6 | 93.4 |
| Viscosity (cP) | 1.3 | 1.5 | 1.8 |
| Viscosity change (%) | 30 | 50 | 80 |
| IFT (mN m−1) | 6.36 | 4.05 | 2.52 |
| IFT change | 77 | 85 | 91 |
| Capillary number (×104) | 1.05 | 1.98 | 3.81 |
| Capillary number ratio (compared to water flooding) | 5.53 | 10.42 | 20.05 |
