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Fluid flow fundamentals (view source)
Revision as of 15:58, 20 January 2014
, 15:58, 20 January 2014→Extension of Darcy's law
* V<sub>g</sub> = volume of gas in a given pore volume
* V<sub>g</sub> = volume of gas in a given pore volume
* V<sub>p</sub> = pore volume
* V<sub>p</sub> = pore volume
[[file:fundamentals-of-fluid-flow_fig3.png|thumb|left|{{figure number|3}}Two-phase relative permeability.]]
The apparent or effective oil permeability, ''k''<sub>eo</sub> of one phase in the presence of a second phase can be arranged as the product of two terms: absolute permeability, ''k''<sub>a</sub>, and relative oil permeability, ''k''<sub>ro</sub>:
The apparent or effective oil permeability, ''k''<sub>eo</sub> of one phase in the presence of a second phase can be arranged as the product of two terms: absolute permeability, ''k''<sub>a</sub>, and relative oil permeability, ''k''<sub>ro</sub>:
:<math>k_{\rm eo} = k_{\rm a} \times k_{\rm ro}</math>
:<math>k_{\rm eo} = k_{\rm a} \times k_{\rm ro}</math>
The absolute permeability is a property of the rock and is essentially the permeability measured with single phase or at 100% single phase saturation. The [[relative permeability]] is a dimensionless quantity whose magnitude is between 1.0 and 0, depending on the saturation (Figure 3). Relative permeabilities are measured in core (petrophysical) laboratories, and the results are reported versus the saturation. Some laboratories normalize relative permeability values with values different than the single phase or 100% saturation value, so some caution needs to be taken in interpreting and using reported data.
The absolute permeability is a property of the rock and is essentially the permeability measured with single phase or at 100% single phase saturation. The [[relative permeability]] is a dimensionless quantity whose magnitude is between 1.0 and 0, depending on the saturation ([[:file:fundamentals-of-fluid-flow_fig3.png|Figure 3]]). Relative permeabilities are measured in core (petrophysical) laboratories, and the results are reported versus the saturation. Some laboratories normalize relative permeability values with values different than the single phase or 100% saturation value, so some caution needs to be taken in interpreting and using reported data.
==Radial flow==
==Radial flow==