Table 2 The results of HPAM and HEC flooding after water flooding (injection rate: 0.5 mL/min).
Core No. | Polymer | Length (cm) | Section area (cm2) | Permeability (µm2) | Porosity (%) | Injected slug (PV) | Incremental oil recovery (%) | ||
|---|---|---|---|---|---|---|---|---|---|
I phase | II phase | III phase | |||||||
Water flooding | HPAM flooding | HEC flooding | |||||||
2-a# | HPAM/HEC (4000 mg/L) | 30 | 4.676 | 1.821 | 34.02 | 0.3 | 36.4 | 3.0 | 3.6 |
2-b# | 30 | 4.676 | 1.812 | 34.16 | 0.4 | 35.9 | 4.3 | 4.9 | |
2-c# | 30 | 4.676 | 1.819 | 33.96 | 0.5 | 37.5 | 5.5 | 6.0 | |
2-d# | 30 | 4.676 | 1.825 | 35.09 | 0.6 | 37.1 | 6.4 | 7.3 | |
2-e# | 30 | 4.676 | 1.809 | 33.82 | 0.7 | 36.2 | 6.2 | 7.9 | |
