Alkaline water flooding with a precipitation inhibitor for enhanced oil recovery
This patent describes a process for the enhanced recovery of oil from a subterranean reservoir penetrated by at least one injection well and at least one production well wherein the reservoir includes an aqueous phase containing dissolved divalent metal cations. The process comprises injecting through an injection well an aqueous solution including an alkaline material sufficient to provide a solution pH of above about 8 and a predetermined amount of water-soluble precipitation inhibitor selected from the group consisting of polyacrylates and acrylate-containing copolymers having a number average molecular weight of from about 500 to about 50,000, polymaleic anhydrides, organo-phosphonates or carboxylate-containing organo-phosphonates selected from the group consisting of aminotrimethylenephosphonic acid, hydroxyethanediphosphonic acid, ethylenediaminetetramethylenephosphonic acid, diethylenetriaminepentamethylenephosphonic acid, hexamethylenediaminetetramethylenephosphonic acid, phosphinopolycarboxylic acid, phosphenobutane tricarboxylic acid and alkali metal or ammonium salts thereof. The predetermined amount is sufficient to prevent substantial precipitation of divalent metal hydroxides or divalent metal carbonates in the injection well or the immediate vicinity of the injection.
- Assignee:
- PPG Industries, Inc., Pittsburgh, PA
- Patent Number(s):
- US 4714113
- OSTI ID:
- 5323586
- Resource Relation:
- Patent File Date: Filed date 5 Dec 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DISPLACEMENT FLUIDS
CHEMICAL COMPOSITION
OIL WELLS
CAUSTIC FLOODING
ALKALINE EARTH METAL COMPOUNDS
AMMONIUM COMPOUNDS
ANHYDRIDES
AQUEOUS SOLUTIONS
BUTANE
CARBONATES
CARBOXYLIC ACIDS
COPOLYMERS
ENHANCED RECOVERY
HYDROXIDES
MALEIC ACID
ORGANIC PHOSPHORUS COMPOUNDS
PETROLEUM
PHOSPHONIC ACIDS
POLYACRYLATES
SOLUTES
WELL STIMULATION
ALKANES
CARBON COMPOUNDS
DICARBOXYLIC ACIDS
DISPERSIONS
ENERGY SOURCES
ESTERS
FLUID INJECTION
FLUIDS
FOSSIL FUELS
FUELS
HYDROCARBONS
HYDROGEN COMPOUNDS
MIXTURES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
POLYMERS
POLYVINYLS
RECOVERY
SOLUTIONS
STIMULATION
WATERFLOODING
WELLS
020300* - Petroleum- Drilling & Production