Method of measuring capillary pressures

Details Method of measuring capillary pressures Method of measuring capillary pressures

1992-02-27

1993-09-21

Williams, Hezron E.

Measuring and testing

With fluid pressure

Porosity or permeability

G01N 1508

Patent

active

052458598

ABSTRACT:
A method for rapidly and accurately determining the threshold and critical capillary pressures of a porous rock sample. A fluid saturating the sample, preferably oil, is withdrawn from the downstream end of the sample at an extremely low rate as a result of the introduction of another fluid, preferably gas, at the upstream end. The other fluid displaces the saturating fluid due to a differential pressure between the upstream and downstream ends of the sample. The differential pressure is created by means which does not require use of back pressure valves, thereby avoiding pressure surges and allowing constant slow withdrawal of the saturating fluid. The threshold and critical capillary pressures may be determined from a trace of the differential pressure.

REFERENCES:
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patent: 3023606 (1962-03-01), Sarem
patent: 3420093 (1969-01-01), Collins
patent: 4304122 (1981-12-01), Tentor
patent: 4625544 (1986-12-01), Yuan et al.
patent: 4672840 (1987-06-01), Cullick
patent: 4773254 (1988-09-01), Shen
patent: 5133207 (1992-07-01), Wilson et al.

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