Difference between revisions of "Mobility Ratio"

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[[Mobility Ratio]] determines the relative rate of one fluid to another (etc. water to oil).
 
[[Mobility Ratio]] determines the relative rate of one fluid to another (etc. water to oil).
:<math> M \le 1</math>
+
:<math> M \le 1</math> stable flow.
:<math> M > 1</math>
+
:<math> M > 1</math> unstable flow, fingering.
  
  

Revision as of 14:02, 25 March 2022

Brief

Mobility Ratio determines the relative rate of one fluid to another (etc. water to oil).

 M \le 1 stable flow.
 M > 1 unstable flow, fingering.


Equation

 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[1]

 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

References

  1. Wolcott, Don (2009). Applied Waterflood Field DevelopmentPaid subscription required. Houston: Energy Tribune Publishing Inc.