PETE311_06A_Class18_(Maggard)

PETE311_06A_Class18_(Maggard) - Electrical Properties...

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Unformatted text preview: Electrical Properties Effect of Clays Effect of Wettability • Clays provide an alternate path for flow of electrical current, violating the assumption in Archie’s Equations that all current flows due to conductivity of formation water – Archie’s Equations are too pessimistic for shaly formations • missed opportunities for development of potentially productive reservoirs • wrong amounts and type of investment in reservoir development due to skewed economic projections Effect of Clays on Electrical Properties • The formation factor ( F=R o /R w ) is constant for a clean sand; F decreases for shaly sand as value of R w increases – due to conductivity of clays becoming more significant compared to conductivity of water – same core sample • with clay present • varying only R w Effect of Clays on Formation Factor • Clays provide an alternate path for flow of electrical current • The “best” saturation equation for shaly formations seems to vary – Jordan and Campbell, Table 6.9 shows – Jordan and Campbell, Table 6....
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This note was uploaded on 12/03/2009 for the course PETE 311 taught by Professor Staff during the Spring '08 term at Texas A&M.

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PETE311_06A_Class18_(Maggard) - Electrical Properties...

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