Calcium-tolerant N-substituted acrylamides as thickeners for aqueous systems
Patent
·
OSTI ID:866174
- 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
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Related Subjects
/526/507/
000
3-acrylamido-3-methylbutanoate
50
acid
acid form
acrylamide
acrylamides
acrylamido-alkanoic
acrylate
acrylic
acrylic acid
added
additionally
additionally contain
agent
alkali
alkali metal
amounts
anoic acid
aqueous
aqueous systems
average
average molecular
cacl
calcium-tolerant
calcium-tolerant n-substituted
charged
contain
control
control agent
copolymer
effective
form
found
highly
highly effective
maintain
metal
metal salt
methods
minor
minor amount
minor amounts
mobility
mobility control
molecular
molecular weight
monomers
n-substituted
n-substituted acrylamide
n-substituted acrylamides
nacl
oil
oil recovery
olefinically
olefinically unsaturated
polymer
presence
random
random copolymer
recovery
recovery method
salt
salts
scope
secondary
sodium
stable
systems
terpolymers
tertiary
tertiary oil
thickeners
unsaturated
unsaturated monomer
unsaturated monomers
unusually
viscosities
water
water-soluble
weight
000
3-acrylamido-3-methylbutanoate
50
acid
acid form
acrylamide
acrylamides
acrylamido-alkanoic
acrylate
acrylic
acrylic acid
added
additionally
additionally contain
agent
alkali
alkali metal
amounts
anoic acid
aqueous
aqueous systems
average
average molecular
cacl
calcium-tolerant
calcium-tolerant n-substituted
charged
contain
control
control agent
copolymer
effective
form
found
highly
highly effective
maintain
metal
metal salt
methods
minor
minor amount
minor amounts
mobility
mobility control
molecular
molecular weight
monomers
n-substituted
n-substituted acrylamide
n-substituted acrylamides
nacl
oil
oil recovery
olefinically
olefinically unsaturated
polymer
presence
random
random copolymer
recovery
recovery method
salt
salts
scope
secondary
sodium
stable
systems
terpolymers
tertiary
tertiary oil
thickeners
unsaturated
unsaturated monomer
unsaturated monomers
unusually
viscosities
water
water-soluble
weight