Calcium-tolerant N-substituted acrylamides as thickeners for aqueous systems

Patent · Thu Jan 01 00:00:00 EST 1987

OSTI ID:866174

McCormick, Charles L ^[1]; Blackmon, Kenneth P ^[1]

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1. Hattiesburg, MS

A water-soluble, charged, random copolymer of acrylamide and an alkali metal salt of an acrylamido-alkanoic acid such as alkali metal 3-acrylamido-3-methylbutanoate, having an average molecular weight of greater than about 50,000, has been found to maintain unusually stable and effective viscosities in the presence of salts such as NaCl and CaCl.sub.2 when added to water in minor amounts, thus making it a highly effective mobility control agent for secondary and tertiary oil recovery methods. Also within the scope of the invention are the acid form of the polymer, as well as terpolymers which additionally contain olefinically unsaturated monomers such as acrylic acid or sodium acrylate.

• Research Organization: University of Southern Mississippi
• DOE Contract Number: AS19-80BC10321
• Assignee: University of Southern Mississippi (Hattiesburg, MS)
• Patent Number(s): US 4649183
• OSTI ID: 866174
• Country of Publication: United States
• Language: English

Related Subjects

calcium-tolerant
n-substituted
acrylamides
thickeners
aqueous
systems
water-soluble
charged
random
copolymer
acrylamide
alkali
metal
salt
acrylamido-alkanoic
acid
3-acrylamido-3-methylbutanoate
average
molecular
weight
50
000
found
maintain
unusually
stable
effective
viscosities
presence
salts
nacl
cacl
added
water
minor
amounts
highly
mobility
control
agent
secondary
tertiary
oil
recovery
methods
scope
form
polymer
terpolymers
additionally
contain
olefinically
unsaturated
monomers
acrylic
sodium
acrylate
recovery method
random copolymer
average molecular
aqueous systems
tertiary oil
minor amounts
oil recovery
alkali metal
molecular weight
metal salt
minor amount
highly effective
mobility control
unsaturated monomers
additionally contain
acrylic acid
acid form
olefinically unsaturated
n-substituted acrylamides
control agent
anoic acid
n-substituted acrylamide
unsaturated monomer
calcium-tolerant n-substituted
/526/507/