VRR

Brief

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

Equation

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

where

$A$ = Area, m2

$h$ = Net pay, oil saturated thickness, m

$HCPV$ = Hydrocarbon pore volume, m3

$\phi$ = Porosity, fraction

$S_o$ = Oil saturation, fraction

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