Difference between revisions of "VRR"

Revision as of 14:10, 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} + 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

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 10: / Line 10: @@
 where
-:<math> A </math> = Area, m2
+:<math> B_{g} </math> = Gas formation volume factor, m3/m3
-:<math> h </math> = Net pay, oil saturated thickness, m
+:<math> B_{gi} </math> = Injected gas formation volume factor, m3/m3
-:<math> HCPV </math> = Hydrocarbon pore volume, m3
+:<math> B_{wi} </math> = Injected water formation volume factor, m3/m3
-:<math> \phi </math> = Porosity, fraction
+:<math> B_{wp} </math> = Produced water formation volume factor, m3/m3
-:<math> S_o </math> = Oil saturation, fraction
+:<math> B_o </math> = Oil formation volume factor, m3/m3
+:<math> GOR </math> = Produced gas oil ratio, m3/m3
+:<math> I_g </math> = Injected gas volume, m3
+:<math> N_p </math> = Oil produced, m3
+:<math> R_s </math> = Solution gas oil ratio, m3/m3
+:<math> VRR </math> = Voidage replacement ratio, fraction
+:<math> W_i </math> = Water injected, m3
+:<math> W_p </math> = Water produced, m3
 ===Related definitions===