VRR

Brief

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

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