Difference between revisions of "VRR"

Revision as of 14:03, 23 March 2022

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

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

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

@@ Line 6: / Line 6: @@
 ===Equation===
-:<math> 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}</math>
+:<math> 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}</math>
 where