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Motivation = maintain formation pressure at sweep interface
The Expected Ultimate Recovery during the waterflood sweep can be assessed with the following formula:
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EUR = E_S \, E_D = E_{SV} \, E_{SHSA} \, E_D |
where
– displacement efficiency, – sweep efficiency, – areal sweep efficiency, – vertical sweep efficiency (see below).
Sweep effciency
| Total sweep | Areal sweep | Vertical sweep |
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| LaTeX Math Block |
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| E_S = \frac{V_{sweep}}{V_\phi} |
| | LaTeX Math Block |
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| E_{SHSA} = \frac{A_{sweep}}{A_\phi} |
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| E_{SV} = \frac{h_{sweep}}{h_\phi} |
|
– sweep volume – pore volume | | – sweep thickness – pore thickness |
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