Method for determining the inlet capillary pressure of a...

Details Method for determining the inlet capillary pressure of a... Method for determining the inlet capillary pressure of a...

2006-09-01

2008-12-16

Larkin, Daniel S (Department: 2856)

Measuring and testing

With fluid pressure

Porosity or permeability

Reexamination Certificate

active

07464582

ABSTRACT:
To perform at least an evaluation of the inlet capillary pressure value of a porous medium. From a displacement experiment on a sample of the medium, a curve of the volume of saturating fluid expelled from the sample as a function of time is drawn. The differential pressure between the inlet face and at least one point located at a distance Li from the inlet face that is greater than the distance between the inlet face and the interface between the two fluids within the sample is then continuously measured as a function of time. At least one motive pressure gradient of the first fluid is thereafter calculated by means of distance Li and of the curve. Finally, at least one value of the inlet capillary pressure is determined by calculating the difference between the differential pressure and the value of the motive pressure gradient of the expelled fluid. The method can be applied notably to production of oil reservoirs for example.

REFERENCES:
patent: 4893504 (1990-01-01), O'Meara, Jr. et al.
patent: 5245859 (1993-09-01), Smith et al.
patent: 5311766 (1994-05-01), Persoff et al.
patent: 6021662 (2000-02-01), Moulu et al.
Hildenbrand A. et al.; “Gas Breakthrough Experiments on Fine-grained Sedimentary Rocks”, Geofluids, vol. 2, Aug. 30, 2001, pp. 3-23.

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