Changes

: <math>P_c = \frac{2 \sigma \cos{\theta}}{r}</math>

: <math>P_c = \frac{2 \sigma \cos{\theta}}{r}</math>

With θ wettability contact, σ is surface tension, and r pore size or curvature of the fluid surface. Capillary pressure data known as wetting phase function. Conversion of laboratory data required to determine the reservoir to reservoir capillarity.

With θ wettability contact, σ is surface tension, and r pore size or curvature of the fluid surface. Capillary pressure data known as wetting phase function. Conversion of laboratory data required to determine the reservoir to reservoir capillarity.

[[File:Formula 4.png|200px|thumbnail|center]]

: <math>P_{c_{res}} = P_{c_{lab}} \frac{\sigma_{res}(\cos{\theta})_{res}}{\sigma_{lab}(\cos{\theta})_{lab}}</math>

If the hydrocarbon pressure equal to the water capillary pressure equal with zero. This point is called as a free water level (FWL).

If the hydrocarbon pressure equal to the water capillary pressure equal with zero. This point is called as a free water level (FWL).

: <math>\text{P}_\text{c} = \text{P}_\text{hc} - \text{P}_\text{w}</math>

: <math>\text{P}_\text{c} = \text{P}_\text{hc} - \text{P}_\text{w}</math>