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Specific type of waterfflood recovery when offtakes are fully compensated by intakes  intakes: 

Instantaneous Voidage Replacement Balance (IVRB) = Δ𝑞 = 0Intakes - Offtakes = 

LaTeX Math Inline
body--uriencoded--\Delta q = q%5e%7B\downarrow%7D_t - q%5e%7B\uparrow%7D_t = 0
 

which is equivalent to: 

Instantaneous Voidage Replacement Ratio (IVRR) =

LaTeX Math Inline
body--uriencoded--\displaystyle %7B\rm IVRR%7D = \frac%7B\rm Intakes%7D%7B\rm Offtakes%7D = \frac%7Bq%5e%7B\downarrow%7D_t%7D%7Bq%5e%7B\uparrow%7D_t%7D
 = 1

See also

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Petroleum Industry / Upstream /  Production / Field Development Plan / Recovery Methods / Waterflood Recovery (WF)