Click here to enlarge image. The J-function, Equation 1 (Equation box), was originally proposed as a means of converting all capillary pressure data for clean sand to a universal curve.

The capillary pressure at each point along the plug at hydrodynamic equilibrium is obtained from Equation (1). In the above equation, P c (r) is the capillary pressure at any given radial position, Δρ ...