Measuring and testing – Borehole or drilling – Fluid flow measuring or fluid analysis
Patent
1996-09-10
1997-04-15
Brock, Michael
Measuring and testing
Borehole or drilling
Fluid flow measuring or fluid analysis
364422, E21B 4704
Patent
active
056211694
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.d is mercury displacement pressure, k.sub.a is air permeability, and .phi. is porosity. The constants set forth in equations (b) and (c) above may be adjusted to fit measured data from rock samples within the reservoir.
REFERENCES:
patent: 4903207 (1990-02-01), Alger et al.
Journal of Petroleum Technology--Thomeer, J.H.M., "Introduction of a Pore Geometrical Factor Defined by the Capillary Pressure Curve", Mar. 1960 pp. 73-77.
JPT, Swanson, B.F., "A Simple Correlation Between Permeabilities and Mercury Capillary Pressures", Dec. 1981, pp. 2,498-2,504.
World Oil--Smith, D. "How to Predict Down-Dip Water Level", May 1992, pp. 85-88.
AAPG Bulletin--Pittman, E.D., "Relationship of Porosity and Premeability to Various Parameters Derived from Mercury Injection Capillary Pressure Curves for Sandstone", vol. 76, No. 2, Feb. 1992, pp. 191-198.
Harris Thomas G.
Hawkins Joseph M.
Luffel Donald L.
Brock Michael
Restech, Inc.
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