Table 2
Oil recovery of heterogeneous sandpacks with different formation water salinities.
| Oil recovery (%) |
||||||||
|---|---|---|---|---|---|---|---|---|
| Number | Sandpack | Porosity | Permeability (μm2) | Permeability ratio | Salinity (mg/L) | Water flooding | Subsequent water flooding after B-PPG treatment | Recovery increment |
| #4 | k high | 0.388 | 7.96 | 5.31 | 5000 | 43.3 | 61.7 | 18.4 |
| k low | 0.371 | 1.50 | 30.8 | 66.2 | 35.4 | |||
| Total | 36.8 | 64.0 | 27.2 | |||||
| #5 | k high | 0.391 | 8.57 | 5.71 | 10 000 | 45.2 | 61.8 | 16.6 |
| k low | 0.371 | 1.50 | 28.7 | 62.5 | 33.8 | |||
| Total | 37.0 | 62.1 | 25.1 | |||||
| #2 | k high | 0.385 | 7.50 | 5.17 | 20 000 | 48.1 | 61.1 | 13.0 |
| k low | 0.369 | 1.45 | 27.6 | 59.7 | 32.1 | |||
| Total | 37.5 | 60.4 | 22.9 | |||||