Oil recovery with water containing carbonate salt, CO/sub 2/, and surfactant

Patent · Tue Mar 29 04:00:00 EST 1988

OSTI ID:5214998

Falls, A H

In an oil recovery process in which CO/sub 2/, aqueous liquid and a preferentially water-soluble, anionic surfactant are injected into a subterranean reservoir to displace oil toward a production location at an injection pressure and rate of fluid production such that the CO/sub 2/ is pressurized to at least more than the fluid pressure in the reservoir, an improvement for reducing the extent to which the surfactant is absorbed on the reservoir rocks is described comprising: including within the aqueous phase of the injected fluid an amount of monovalent cationic carbonic acid salt which is effective for increasing the pH of the solution at the conditions within the reservoir to an extent which reduces the level of the adsorption of the surfactant.

• Assignee: Shell Oil Co., Houston, TX
• Patent Number(s): US 4733727
• OSTI ID: 5214998
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
AQUEOUS SOLUTIONS
CARBON COMPOUNDS
CARBON DIOXIDE INJECTION
CARBONIC ACID
CHEMICAL COMPOSITION
COMPRESSIBLE FLOW
DISPERSIONS
DISPLACEMENT FLUIDS
ENERGY SOURCES
ENHANCED RECOVERY
FLUID FLOW
FLUID INJECTION
FLUID MECHANICS
FLUIDS
FOSSIL FUELS
FUELS
HYDRAULICS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MECHANICS
MISCIBLE-PHASE DISPLACEMENT
MIXTURES
OIL WELLS
OXYGEN COMPOUNDS
PETROLEUM
RECOVERY
ROCK-FLUID INTERACTIONS
SALTS
SOLUTIONS
STIMULATION
SURFACTANTS
WATERFLOODING
WELL STIMULATION
WELLS