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PETE311_06A_Class33_(Maggard)

PETE311_06A_Class33_(Maggard) - Standings Relative...

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Standing’s Relative Permeability Correlation (Part 3—Imbibition Theory)
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Relative Permeability Hysteresis Drainage: Capillary and viscous forces operate in the same direction. Imbibition: Capillary and viscous forces operate in opposite directions, resulting in a portion of the non-wetting phase becoming trapped and unable to move.
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Calculation of Non-wetting Phase Relative Permeability (Land) Basis: Correct for amount of “trapped” phase. Use resulting “free” saturation for the calculations. Equations written for a gas-water two- phase system, gas is non-wetting phase. Applies oil-water system if it is strongly water-wet.
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Trapped Gas Saturation
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Hysteresis and Trapping Constant Determination of S or,max after Geffen et al.
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Trapping Constant - Example Consider Standing’s Eqs. 22 and 24. At irreducible wetting phase saturation (drainage) iw or or S S S = 1 * 1 * = oi S * * 1 1 oi or S S C = 1 ) ( 1 max * = or S C
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Trapping Constant - Example For the Geffen et al data, calculate the trapping constant, C, given the irreducible wetting (water) saturation, S iw =0.20 Curve
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