PETE311_06A_Class21_(Maggard)

PETE311_06A_Class21_(Maggard) - Capillary Pressure and...

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Capillary Pressure and Saturation History Capillary Pressure in Reservoir Rock
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DRAINAGE AND IMBIBITION CAPILLARY PRESSURE CURVES Drainage Imbibition S wi S m S w P d P c 00 . 5 1.0 Modified from NExT, 1999, after … DRAINAGE Fluid flow process in which the saturation of the nonwetting phase increases IMBIBITION Fluid flow process in which the saturation of the wetting phase increases Saturation History - Hysteresis - Capillary pressure depends on both direction of change, and previous saturation history - Blue arrow indicates probable path from drainage curve to imbibition curve at S wt =0.4 -A tS m , nonwetting phase cannot flow, resulting in residual nonwetting phase saturation (imbibition) wi , wetting phase cannot flow, resulting in irreducible wetting phase saturation (drainage)
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Saturation History •T h e s a m e P c value can occur at more than one wetting phase saturation
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Rock Type • Rock Type (Archie’s Definition - Jorden and Campbell) – Formations that “. .. have been deposited under similar conditions and . .. undergone similar processes of later
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PETE311_06A_Class21_(Maggard) - Capillary Pressure and...

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