Method and apparatus for determining the wettability of an earth

Details Method and apparatus for determining the wettability of an earth Method and apparatus for determining the wettability of an earth

1990-06-25

1992-09-22

Williams, Hezron E.

Measuring and testing

Borehole or drilling

Downhole test

E21B 4900

Patent

active

051487055

ABSTRACT:
A method and apparatus for determining the wettability of an earth formation wherein a fluid sample from the wall of a borehole penetrating said formation is extracted then reinjected into the wall of the formation. A pressure versus time curve is generated throughout the test from which the wettability of the formation is determined by comparing how much the injection pressure varies from the static pressure to how much the extraction pressure varies from the static pressure. A wettability index can also be determined from the areas under the curve.

REFERENCES:
patent: 2747401 (1956-05-01), Doll
patent: 3115775 (1963-12-01), Russell
patent: 4210018 (1980-07-01), Brieger
Anderson, W. G., "Wettability Literature Survey-Part 2 Wettability Measurnt", Journal of Petroleum Technology, Nov. 1982, pp. 1246-1262.
Desbrondes, R. and J. Guoldron, "In Situ Rock Wettability Determination with Wireline Formation Tester Data", The Log Analyst, Jul.-Aug. 1988, pp. 244-251.
Desbrondes, R. "In Situ Wettability Determination Improves Formation Evaluation, Part 1, Wettability Concept", Pet. Eng. Inter., May 1989.
Desbrondes, R. "In Situ Wettability Determination Improves Formation Evaluation, Part 2", Petroleum Engineer International, Aug. 1989.
Desbrondes, R. "In Situ Wettability Determination in Gas Reservoirs", 1989 SPE Gas Technology Symposium Paper, Jun. 7-9, 1989.

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