Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1991-09-20
1993-11-16
William, Hezron E.
Measuring and testing
With fluid pressure
Porosity or permeability
G01N 1508
Patent
active
052612678
ABSTRACT:
Method and apparatus for determining heterogeneous properties of a core sample by use of pressure transients. In the method, a pressure is applied to a first closed vessel at one end of a core sample. The pressure is then allowed to dissipate into the core and into a second closed vessel at the other end of the core sample. The pressure in at least one of the vessels or the core itself is measured and recorded as a function of time during the pressure dissipation. The volume of the first vessel is then varied and pressure is once again applied to the first vessel and allowed to dissipate into the core and second vessel. The pressure is again measured and recorded as a function of time during the pressure dissipation. The two sets of recorded measurements are then analyzed to detect deviations from theoretical responses in homogeneous cores which identify heterogeneities. Preferably, the volume of the first vessel has in either the first or second test a volume sufficiently small to cause a measurable variance between an actual pressure transient response for the system and a theoretical pressure transient response for the system. By using a small volume in both tests and reversing the direction of the second test, different heterogeneous properties may be detected.
REFERENCES:
patent: 2867116 (1959-01-01), Aronofsky et al.
patent: 4537063 (1985-08-01), Barnaby
patent: 4555934 (1985-12-01), Freeman et al.
patent: 4627270 (1986-12-01), Jones
A Transient Laboratory Method for Determining the Hydraulic Properties of "Tight" Rocks--I. Theory, P. A. Hsieh et al, Int. J. Rock Mech. Min Sci. & Geomech. Abstr., vol. 18, pp. 245-252 (1981).
Boyer Russ E.
Kamath Jairam
Nakagawa Frank M.
Brock Michael
Carson Matt W.
Chevron Research and Technology Company
Keeling Edward J.
William Hezron E.
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