| Scheme number | Polymer injection scheme | Core porosity (%) |
Oil recovery during different stages (%) | |||||
|---|---|---|---|---|---|---|---|---|
| Concentration (mg/L) |
Injection volume (PV) |
Viscosity (mPa·s) |
Front water flooding | Polymer flooding | Subsequent water flooding | Total | ||
| 2-1 | 2000 | 0.9 | 204.5 | 25.7 | 18.10 | 20.14 | 11.93 | 50.17 |
| 2-2 | 2000 | 0.3 | 204.5 | 26.8 | 18.70 | 24.40 | 11.03 | 54.13 |
| 1600 | 0.6 | 85.6 | ||||||
| 800 | 0.3 | 43.2 | ||||||