Patent ID: 8805616
Filing Date: 2014-08-12
Classification: C09K,E21B,G01N

Abstract:
1. A method for determining a characteristic of an underground formation with a fluid comprising: measuring a permeability of a sample material of the underground formation; measuring a porosity of the sample material; performing a drainage test on the sample material using the fluid; estimating, via a processor, a geometric mean capillary pressure of the sample material from the drainage test; and determining, via the processor, a receding contact angle of the fluid on the sample material from the estimated geometric mean capillary pressure, the measured permeability, and the measured porosity; wherein estimating the geometric mean capillary pressure comprises: determining a threshold pressure representing a pressure threshold for directing a non-wetting fluid into a largest radii capillary of the sample material; determining an irreducible saturation pressure representing a pressure for directing the non-wetting fluid into a smallest radii capillary of the sample material; and calculating the geometric mean capillary pressure based on the threshold pressure and the irreducible saturation pressure.