Inventors:
Thomas G. Harris - Houston TX
Donald L. Luffel - Houston TX
Joseph M. Hawkins - Houston TX
Assignee:
Restech, Inc. - Houston TX
International Classification:
E21B 4704
Abstract:
A method for predicting the hydrocarbon/water contact level for oil and gas wells which relates porosity. phi. , water saturation S. sub. w, air permeability k. sub. a, and capillary pressure P. sub. c. Such contact level may be estimated without actual capillary pressure measurements. The method relies on a worldwide correlation of permeability and porosity to a function of capillary pressure. The hydrocarbon/water contact levels are predicted through regression analysis using porosity. phi. , water saturation S. sub. w, and air permeability k. sub. a from well log and core analysis information. Relationships used in this method include ##EQU1## where P. sub. c is mercury capillary pressure, F. sub. g is pore geometrical factor, S. sub. w is water saturation, P. sub.