PETE311_06A_Class24_(Maggard)

PETE311_06A_Class24_(Maggard) - Capillary Pressure...

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Capillary Pressure: Reservoir Seal Capillary Pressure / Saturation Relationship (S w * Model)
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S w * Power Law Model • Power Law Model (log-log straight line) – “Best fit” of any data set with a straight line model can be used to determine two unknown parameters. For this case: • slope gives λ • intercept gives P d –S wi must be determined independently • it can be difficult to estimate the value of S wi from cartesian P c vs. S w plot, if the data set does not clearly show asymptotic behavior () 1/ λ * w d c S P P = wi wi w * w S 1 S S S =
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Type Curves •A T y p e C u r v e is a dimensionless solution or relationship – Dimensionless means that it applies for any values of specific case parameters – Petroleum Engineers often use type curves to determine model parameters • well test analysis • well log analysis • production data analysis • analysis of capillary pressure data
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Type Curves • Process of type curve matching – Step 1: observed data is plotted using an appropriate format • The data and type curve must be plotted using the same sized grid (ie. 1 log cycle = 1 log cycle) – Step 2: a “match” is found between observed data and a dimensionless solution by sliding the data plot over the type curve plot (horizontal and vertical sliding only) – Step 3: the “match” is used to determine model parameters for the observed data • Often values are recorded from an arbitrary “match point” on both the data plot and type curve plot
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PETE311_06A_Class24_(Maggard) - Capillary Pressure...

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