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E_D = \frac{1-s_{wi}-s_{orw}}{1-s_{wi})} |
where
– inititial water in oil pay, – residual oil to water sweep. Gas flooding
Motivation = maintain formation pressure at sweep interface with gas in case of high water mobility
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| body | \frac{k_{rw}}{\mu_w} \gg \frac{k_{ro}}{\mu_o} |
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which makes watrflood inefficient.
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E_D = \frac{1-s_{wi}-s_{org}}{1-s_{wi})} |
where
– inititial water in oil pay, – residual oil to gas sweep.
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
.
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E_D = \frac{1-s_{wi}-s_{or \, eorori}}{1-s_{wi})} |
where
– inititial water in oil pay, – residual oil to injection sweep.
CО2 injection
Reference
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[1]
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