Scheme number | Polymer injection scheme | Oil recovery during different stages (%) | ||||
---|---|---|---|---|---|---|
Concentration (mg/L) |
Injection time (h) |
Front water flooding | Polymer flooding | Subsequent water flooding | Total | |
1-1 | 2000 | 3 | 51.28 | 20.15 | 2.39 | 73.82 |
1-2 | 2000 | 1 | 50.84 | 28.36 | 2.17 | 81.37 |
1600 | 2 | |||||
800 | 1 |