Enhanced oil recovery method employing an aqueous polymer

Patent · Tue Jun 06 04:00:00 EDT 1989

OSTI ID:5586671

Hsieh, W C

This patent describes a method for recovering petroleum from a subterranean petroleum-containing formation penetrated by at least one injection well and by at least one spaced-apart production well, both wells being in fluid communication with the formation. The method consists of: injecting a sufficient amount of an aqueous polymer solution through the injection well into the formation so as to displace the petroleum in the formation towards the production well. The aqueous polymer solution consists of: water; at least one polymer comprising from about 45 to about 65 weight percent ethylacrylate monomer residue, from about 10 to about 45 weight percent methylacrylic acid residue, and from about 10 to about 30 weight percent acrylic acid monomer residue; from about 2 to about 10 parts per 100 part of monomer of a co-surfactant system comprising: (a) at least one nonylphenol polyethylene oxide ether sulfate, wherein the polyethylene oxide adduct of the nonlyphenol polyethylene oxide either sulfate is comprised at about 20 moles of ethylene oxide monomer residue; and (b) at least one propoxylated, ethoxylated propylene glycol nonionic surfactant block polymer, wherein the ratio of ether sulfate to the block polymer is from about 1:2 to about 10:1.

• Assignee: Union Oil Co. of California, Los Angeles, CA
• Patent Number(s): US 4836282
• OSTI ID: 5586671
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
CHEMICAL COMPOSITION
DISPLACEMENT FLUIDS
ENERGY SOURCES
ENHANCED RECOVERY
FLUID INJECTION
FLUIDS
FOSSIL FUELS
FUELS
OIL WELLS
PETROLEUM
POLYMERS
RECOVERY
STIMULATION
WATERFLOODING
WELL STIMULATION
WELLS