Changes

Surface pressure of two different types of fluid known as capillary pressure. Capillary pressure is influenced by the pore size and wettability.  

Surface pressure of two different types of fluid known as capillary pressure. Capillary pressure is influenced by the pore size and wettability.  

[[File:Formula 3.png|200px|thumbnail|center]]

: <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]]

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

To determine fluid contacts must be known threshold value of pressure (Pct) is known from the curve Pc against Sw.  

To determine fluid contacts must be known threshold value of pressure (Pct) is known from the curve Pc against Sw.  

[[File:Formula6.png|350px|thumbnail|center]]

[[File:Formula6.png|350px|thumbnail|center]]

===<big>Compressibility</big><big></big>===

===<big>Compressibility</big><big></big>===