Measuring and testing – Borehole or drilling – Downhole test
Patent
1991-01-16
1991-12-03
Myracle, Jerry W.
Measuring and testing
Borehole or drilling
Downhole test
73 38, E21B 4900
Patent
active
050690655
ABSTRACT:
A core sample of a porous rock having a wettability representative of a subterranean formation is saturated with a first medium. This first medium is then displaced with an immiscible second medium. Capillary pressure versus wetting phase saturation is measured during the displacement of the first medium with the second medium within the core sample. Mercury is injected into an evacuated core sample of the porous rock, mercury vapor acting as a wetting phase on the porous rock. Capillary pressure versus wetting phase saturation is measured during mercury injection on the evacuated core sample. The ratio of the two capillary pressure versus wetting phase saturation measurements is determined and taken to be an indicator of the wettability of different size pore throats in the porous rock.
REFERENCES:
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patent: 4868751 (1989-09-01), Dogru et al.
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patent: 4924187 (1990-05-01), Sprunt et al.
patent: 4926128 (1990-05-01), Givens
Journal of Petroleum Technology, Nov. '86, "Wettability Literature Survey--Part 2: Wettability Measurement", pp. 1246-1262.
"Recommended Practice for Core-Analysis Procedure", API Recommended Practice 40 (RP 40), 1st Edition, Aug. 1960, pp. 2-55.
Collins Samuel H.
Sprunt Eve S.
Hager Jr. George W.
McKillop Alexander J.
Mobil Oil Corporation
Myracle Jerry W.
Speciale Charles J.
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