Interfacial tension = 32 mN/m Given that: Salt water gravity = 1.15 Formation permeability = 18 md Calculate: Contact angle = 30 Formation porosity = 14% 1. Capillary pressure in psi if the average pore size is 0.0001 cm 2. Capillary rise if the average pore size is 0.0001 cm 3. Capillary pressure if formation permeability and porosity have decreased to 12 md and 10%, respectively 4. Formation compressibility, if reduction in porosity was due a pressure drop of 800 psi.