PERMEABILITY IN PARALLEL AND SERIES

CALCULATION OF PERMEABILITY FOR STRATA SERIES

It is done through pressure drop:

Equating and simplifying A’s:

Resulting in an harmonic average permeability

CALCULATION OF PERMEABILITY FOR PARALLEL LAYERS

If all layers have the same width, then it is a simple average

This relationship applies when the strata are homogeneous such that PI – P2 is constant in all layers at equal distances.

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