A property characterizing agility of the fluid under pressure gradient and quantified as a ratio of reservoir permeability by dynamic fluid viscosity:
(1) | M = \frac{k}{\mu} |
where
k | formation permeability to a given fluid (which vary for different fluids) |
---|---|
\mu | dynamic fluid viscosity |
In multiphase flow the concept of total fluid mobility is not well-defined as phases may have different mobilities and flow quite independently from each other, having different pressures, moving at different velocities and segregated in space.
In most popular case of a 3-phase Oil + Gas + Water fluid model with relatively homogeneous flow (phases may move at different velocities but occupy the same reservoir space and have the same pressure) the multi-phase mobility may be defined by Perrine model:
| \displaystyle \Rightarrow |
|
In case of 2-phase Oil + Water fluid model with regular to small values of
R_s (when Perrine model makes the most practical sense):
| \displaystyle \Rightarrow |
|
See also
Physics / Fluid Dynamics / Percolation
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Field Study & Modelling / [ Complex reservoir properties ] [ Basic diffusion model parameters ]
[ Petrophysics ] [ Basic reservoir properties ] [ Permeability ] [ Absolute permeability ] [Relative permeability] [ Wettability ] [ Phase mobility ] [ Relative phase mobilities ]