A property characterizing characterising agility of the the reservoir fluid under pressure gradient and quantified as a ratio value of reservoir permeability by normalised by dynamic fluid viscosity:
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M = \frac{k}{\mu} |
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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:
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M = k_{air} \cdot \left[M_{rw} + \left( 1 + \frac{R_s \, B_g}{B_o} \right) \cdot M_{ro} + \left( 1 + \frac{R_v \, B_o}{B_g} \right) \cdot M_{rg} \right] |
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| Multihase Fluid Mobility |
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| Multihase Fluid Mobility |
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body | \displaystyle \Rightarrow |
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\left<\frac{k}{\mu} \right> = k_{air} \cdot \left[ \frac{k_{rw}}{\mu_w} + \left( 1 + \frac{R_s \, B_g}{B_o} \right) \cdot \frac{k_{ro}}{\mu_o} + \left( 1 + \frac{R_v \, B_o}{B_g} \right) \cdot \frac{k_{rg}}{\mu_g} \right] |
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M = k_{air} \cdot \left[ M_{rw} + M_{ro} \right] |
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body | \displaystyle \Rightarrow |
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See also
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Physics / Fluid Dynamics / Percolation
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[ Petrophysics ] [ Basic reservoir properties ] [ Permeability ] [ Absolute permeability ] [Relative permeability] [ Wettability ] [ Phase mobility ] [ Relative phase mobilities ] [ Relative Reservoir Fluid Mobility ]