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

Patent · 01 January 1986

OSTI ID:865824

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

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1. Hattiesburg, MS

A water-soluble ionically-charged random copolymer of acrylamide and an alkaline or 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 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 4584358
• OSTI ID: 865824
• Country of Publication: United States
• Language: English

Related Subjects

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000
3-acrylamido-3-methylbutanoate
50
acid
acrylamide
acrylamides
acrylate
acrylic
acrylic acid
added
additionally
additionally contain
agent
alkali
alkali metal
alkaline
amounts
aqueous
aqueous systems
average
average molecular
cacl
calcium-tolerant
calcium-tolerant n-substituted
contain
control
control agent
copolymer
effective
found
highly
highly effective
ionically-charged
maintain
metal
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
presence
random
random copolymer
recovery
recovery method
salts
scope
secondary
sodium
stable
systems
terpolymers
tertiary
tertiary oil
thickeners
unsaturated
unsaturated monomer
unsaturated monomers
unusually
viscosities
water
water-soluble
weight