Drainage capillary-pressure functions and their computation from one another
Drainage capillary-pressure functions determined on the same rock material with various fluid-fluid combinations, including the mercury-air system, can be computed from one another with the aid of the ratio of the measured relevant fluid/fluid interfacial tensions. In the case of the mercury-air system, surface tension was found to be time dependent and, after a certain time, to reach an almost constant value. It is this value that should be used in transforming mercury capillary pressures to other fluid-fluid systems. Additional measurements of drainage capillary-pressure functions for the rock-gas-oil system in the presence of connate water show that at sufficiently high gas-oil capillary pressures, very low residual-oil saturations are obtained, independent of whether the oil phase spreads on water or not in the presence of gas. Low oil saturations also are obtained in gravity-drainage experiments after long drainage times when the capillary pressure is sufficiently high, possibly as a result of oil film flow.
- OSTI ID:
- 6388671
- Report Number(s):
- CONF-7210140-
- Journal Information:
- Soc. Pet. Eng. AIME, Pap.; (United States), Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Vol. SPE-4096; ISSN SEAPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
AIR
CAPILLARY FLOW
CONNATE WATER
DRAINAGE
ELEMENTS
ENERGY SOURCES
FILM FLOW
FLUID FLOW
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
GROUND WATER
HYDROGEN COMPOUNDS
INTERSTITIAL WATER
MATHEMATICS
MERCURY
METALS
MULTIPHASE FLOW
NATURAL GAS
OXYGEN COMPOUNDS
PETROLEUM
RESERVOIR PRESSURE
RESIDUAL PETROLEUM
SURFACE PROPERTIES
SURFACE TENSION
TESTING
WATER
WETTABILITY