Improved scaling technique for two-phase pressure-saturation relationships

摘要

Current methods of scaling imbibition and drainage pressure-saturation data scale the capillary pressure head using ratios of surface tension, constant intrinsic contact angle, fluid density difference and bubbling pressure. These methods are applicable to scaling either the main drainage or imbibition curve for different fluid pairs. However, for a given fluid pair, scaling of the drainage to the imbibition curve is generally unsatisfactory. For the drainage to imbibition case, the maximum error in computed saturations typically occurs at saturations representative of the funicular zone. It is proposed that an empirical functional relationship between advancing and receding apparent contact angles for a specific porous medium can be used to improve the scaling of imbibition to drainage pressure-saturation data for organic liquid-water systems.