Table 7 Factors controlling polymer retention (positive refers to the retention increment, while negative is its decrease).
From: A comprehensive review of viscoelastic polymer flooding in sandstone and carbonate rocks
No | Factors | Effect on polymer retention |
|---|---|---|
1 | Permeability (but retention is insensitive to permeability variation above 200 mD) | Negative |
2 | Polymer Molecular Weight | Positive |
3 | Calcite and Shale Content | Positive |
4 | Wettability (towards oil-wet) | Negative |
5 | Oil Presence | Negative |
6 | Brine Salinity | Positive |
7 | Brine Hardness | Positive |
8 | Polymer Concentration | Inconclusive |
