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| Total sweep | Areal sweep | Vertical sweep |
|---|
| LaTeX Math Block |
|---|
| E_S = \frac{V_{sweep}}{V_\phi} |
| | LaTeX Math Block |
|---|
| E_{SH} = \frac{A_{sweep}}{A_\phi} |
| | LaTeX Math Block |
|---|
| E_{SV} = \frac{h_{sweep}}{h_\phi} |
|
– sweep volume – pore volume | | – sweep thickness – pore thickness |
Displacement efficiency
| LaTeX Math Block |
|---|
|
E_D = \frac{1-s_{wi}-s_{or}}{1-s){wi}} |
Gas flooding
WAG flooding
Water and gas flodding.
Motivation = increas displacement as residual oil saturation to gas sweep is less than to water sweep
.Chemical EOR
CО2 injection
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