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Units = dimensionless

The concept of relative permeability implies that different phases sweep through the same rock and under the same pressure gradient at different pace even if their viscosities are the same.

It is closely related to Wettability.

The re

Mathematical models of relative permeability are called RPM.

The usual practice is to build 

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relative permeability depends on the current rock saturation:

k_{r\alpha} = k_{r\alpha}(s = \{s_\alpha\})

For 3-phase Oil + Gas + Water fluid model this is going to be:

k_{rw} = k_{rw}(s_w, s_g)

k_{ro} = k_{ro}(s_w, s_g)

k_{rg} = k_{rg}(s_w, s_g)

Mathematical models of relative permeability are often abbreviated RPM.

See also

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Physics /  Fluid Dynamics / Percolation

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Petroleum Industry / Upstream / Subsurface E&P Disciplines / PetrophysicsField Study & Modelling 

[ PermeabilityPetrophysics ] [ Absolute permeabilityBasic reservoir properties ] [ Wettability ] [ Permeability ] [ Absolute permeability ]  [Relative permeability] 

Reference

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[1] Fekete – Relative Permeability Correlations