Wettability literature survey - Part 1: Rock/oil/brine interactions and the effects of core handling on wettability
Wettability is a major factor controlling the location, flow and distribution of fluids in a reservoir. The wettability of a core will affect almost all types of core analyses, including capillary pressure, relative permeability, waterflood behavior, electrical properties, and simulated tertiary recovery. The most accurate results are obtained when native- or restored-state cores are run with native crude oil and brine at reservoir temperature and pressure. Such conditions provide cores that have the same wettability as the reservoir. The wettability of originally water-wet reservoir rock can be altered by the adsorption of polar compounds and/or the deposition of organic material that was originally in the crude oil. The degree of alteration is determined by the interaction of the oil constituents, the mineral surface, and the brine chemistry. The procedures for obtaining native-state, cleaned, and restored-state cores are discussed, as well as the effects of coring, preservation, and experimental conditional conditions on wettability. Also reviewed are methods for artificially controlling the wettability during laboratory experiments.
- Research Organization:
- Conoco, Inc., Ponca City, OK
- OSTI ID:
- 7247735
- Journal Information:
- J. Pet. Technol.; (United States), Vol. 38:11
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DRILL CORES
WETTABILITY
OIL WELLS
RESERVOIR ROCK
ROCK-FLUID INTERACTIONS
ADSORPTION
BENCH-SCALE EXPERIMENTS
BRINES
DEPOSITION
ELECTRICAL PROPERTIES
PERMEABILITY
PETROLEUM
POLAR COMPOUNDS
PRESSURE EFFECTS
RESEARCH PROGRAMS
RESERVOIR FLUIDS
RESERVOIR PRESSURE
RESERVOIR TEMPERATURE
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
PHYSICAL PROPERTIES
SORPTION
WELLS
020200* - Petroleum- Reserves
Geology
& Exploration