VRR

Brief

VRR stands for voidage replacement ratio. It is the ratio of injected fluid to produced fluid at the reservoir conditions.

VRR is calculated with the current rates and on the cumulative basis VRRcum.

Equation

$VRR = \frac{Injected\ reservoir\ volumes}{Produced\ reservoir\ volumes} = \frac{W_i B_{wi} + I_g B_{gi}}{N_p B_o + W_p B_{wp} + B_g(GOR-R_s)N_p}$

where

$B_{g}$ = Gas formation volume factor, m3/m3

$B_{gi}$ = Injected gas formation volume factor, m3/m3

$B_{wi}$ = Injected water formation volume factor, m3/m3

$B_{wp}$ = Produced water formation volume factor, m3/m3

$B_o$ = Oil formation volume factor, m3/m3

$GOR$ = Produced gas oil ratio, m3/m3

$I_g$ = Injected gas volume, m3

$N_p$ = Oil produced, m3

$R_s$ = Solution gas oil ratio, m3/m3

$VRR$ = Voidage replacement ratio, fraction

$W_i$ = Water injected, m3

$W_p$ = Water produced, m3

Related definitions

Pore volume:

$PV = A * h * \phi$

Movable pore volume:

$MOPV = A * h * \phi *(1-S_{wc}-S_{orw})$

where

$S_{wc}$ = Connate water saturation, fraction

$S_{orw}$ = Residual oil saturation, fraction

See Also

• HCPVinj
• STOIIP
• Pattern
• Block
• Mature Water Flood Analysis