PETE311_06A_Class06_(Maggard)

PETE311_06A_Class06_(Maggard) - PERMEABILITY Some slides in...

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PERMEABILITY Some slides in this section are from NExT PERF Short Course Notes , 1999. Some slides appear to have been obtained from unknown primary sources that were not cited by NExT. Note that some slides have a notes section.
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Permeability • Definition (ABW, Ref: API 27) – … permeability is a property of the porous medium and is a measure of the capacity of the medium to transmit fluids – … a measure of the fluid conductivity of the particular material • Permeability is an INTENSIVE property of a porous medium (e.g. reservoir rock)
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Sources for Permeability Determination • Core analysis • Well test analysis (flow testing) – RFT (repeat formation tester) provides small well tests • Production data – production logging measures fluid flow into well • Log data – MRI (magnetic resonance imaging) logs calibrated via core analysis
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Examples, Typical Permeability- Porosity Relationship From Tiab and Donaldson, 1996
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Darcy’s Apparatus for Determining Permeability h 1 -h 2 h 1 h 2 (Sand Pack Length) L q A W A T E R WATER q A •Flow is Steady State •q = K A (h 1 -h 2 )/L K is a constant of proportionality •h 1 >h 2 for downward flow
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PERMEABILITY (k) • Darcy’s “K” has a unit of m/s and is called hydraulic conductivity • Permeability can be easily obtained from K: • or hydraulic conductivity can be easily obtained from k k g μ ρ K K μ g k
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Review - Derived Units • Consider Newton’s 2nd Law for constant mass, F=ma
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PETE311_06A_Class06_(Maggard) - PERMEABILITY Some slides in...

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