Relative Permeability

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Brief

Relative Permeability is the ratio of the effective permeability to base oil permeability measured at connate water saturation.

 k_{ro} = k_o/k_{oS_{wir}}
 k_{rw} = k_w/k_{oS_{wc}}

where

 k_{ro} Oil relative permeability, fraction
 k_{rw} Water relative permeability, fraction
 k_o Effective water permeability, mD
 k_w Effective water permeability, mD
 k_{oS_{wc}} Effective oil permeability at irreducible oil saturation, mD
 S_{wc} Connate water saturation, fraction

Example

Determine the Mobility Ratio using the following data[1]:
Core is at 70% water and 30% oil saturation. Water phase permeability is 248 mD, oil phase permeability is 50 mD. Water viscosity is 1 cP, oil viscosity is 3 cP.

 M = \frac{248/1}{50/3} =15

In this case the mobility of water is 15 times higher than the mobility of water.

See Also

References

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