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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 |
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Water displacement efficiency
| LaTeX Math Block |
|---|
|
E_D = \frac{1-s_{wi}-s_{orw}}{1-s_{wi})} |
...
Motivation = maintain formation pressure at sweep interface with gas in case of high water mobility
| LaTeX Math Inline |
|---|
| body | \frac{k_{rw}}{\mu_w} \gg \frac{k_{ro}}{\mu_o} |
|---|
|
which makes watrflood inefficient
.
Gas displacement efficiency
| LaTeX Math Block |
|---|
|
E_D = \frac{1-s_{wi}-s_{org}}{1-s_{wi})} |
WAG flooding
Motivation = maintain formation pressure at sweep interface with alternating inejction of water and gas in case of high residual oil to water sweep is high
and gas sweep is less than to water sweep
.
| LaTeX Math Block |
|---|
|
E_D = \frac{1-s_{wi}-s_{org}}{1-s_{wi})} |
Chemical EOR
Motivation = maintain formation pressure at sweep interface with chemical injection and reduce residual oil to EOR sweep
| LaTeX Math Inline |
|---|
| body | s_{or \, eor} < s_{orw} |
|---|
|
.
| LaTeX Math Block |
|---|
|
E_D = \frac{1-s_{wi}-s_{or \, eor}}{1-s_{wi})} |
CО2 injection
Reference
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[1]
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