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Average permeability for Linear flow - Series beds

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Average Permeability for Linear flow - Series beds Formula and Calculator

 In fluid mechanics Permeability, is defined as the ability of a porous material to allow fluids to pass through it. The permeability of a medium is related to its porosity and also to the shapes of the pores in the medium and their level of connectedness.

Eq. 1
k_avg = ( L₁ + L₂ + L₃ ) / ( L₁ / k₁ + L₂ / k₂ + L₃ / k₃ )

Eq. 2
k_avg = Σ L_n / Σ (L_n / k_n )

Where:

k_avg = Average Permeability in Linear Systems Series (mD)
k₁ = Permeability for layer 1 (mD)
k₂ = Permeability for layer 2 (mD)
k₃ = Permeability for layer 3 (mD)
L₁ = Length of layer 1 (ft)
L₂ = Length of layer 2 (ft)
L₃ = Length of layer 3 (ft)

mD = millidarcy

Source

• Ahmed, T. (2006). Reservoir Engineering Handbook. Elsevier, Page: 240.

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