Mobility Ratio

Brief

Mobility Ratio determines the relative rate of one fluid to another (etc. water to oil). The waterflood is driven by pore volumes of injected fluid. Everything that is of practical interest occurs between zero to three pore volumes injected .

Equation

Failed to parse (syntax error): M = \frac{k_w/ \mu_w}{k_o/ \mu_o}=\frac{k_{rw}/ \mu_w}{k_{ro}/ \mu_o}=\frac{q_w B_w{q_o B_o}

where

$A$ = Area, m2

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

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

$HCPV$ = Hydrocarbon pore volume, m3

$HCPV_{inj}$ = Injected hydrocarbon pore volumes, fraction

$W_i$ = Cumulative water injection volume, m3

$\phi$ = Porosity, fraction

$S_o$ = Oil saturation, fraction

Related definitions

Dimensionless injected pore volume:

$W_{iD} = \frac{W_i * B_{wi}}{PV} = \frac{W_i * B_{wi}}{A * h * \phi}$

Injected movable pore volume:

$MOPV_{inj} = \frac{W_i * B_{wi}}{MOPV} = \frac{W_i * B_{wi}}{A * h * \phi *(1-S_{wc}-S_{orw})}$

where

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

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

See Also

• HCPV
• STOIIP
• VRR
• Pattern
• Block
• Mature Water Flood Analysis