Method for determining hydraulic properties of formations surrou

Details Method for determining hydraulic properties of formations surrou Method for determining hydraulic properties of formations surrou

1991-09-17

1993-09-28

Williams, Hezron E.

Measuring and testing

Borehole or drilling

Downhole test

E21B 4900

Patent

active

052478300

ABSTRACT:
Methods for determining hydraulic properties of a formation surrounding a borehole are disclosed. The methods use a borehole tool preferably having a first probe for injecting fluid into a formation or obtaining fluid from the formation, a second probe vertically displaced relative to the first probe, and a third probe azimuthally displaced relative to the first probe. The method generally comprises: varying the pressure at the first probe of the borehole tool; measuring pressures at the second and third probes resulting from the varying of pressure at the first probe; and utilizing the pressures measured at the second and third probes to determine values over time of a function related to the hydraulic properties of the formation. This function is a function of the geometry and rock and fluid properties of the formation but is independent of the manner in which the pressure is varied at the first probe.

REFERENCES:
patent: 2747401 (1956-05-01), Doll

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