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

Patent · Wed Jan 01 00:00:00 EST 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

calcium-tolerant
n-substituted
acrylamides
thickeners
aqueous
systems
water-soluble
ionically-charged
random
copolymer
acrylamide
alkaline
alkali
metal
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
terpolymers
additionally
contain
olefinically
unsaturated
monomers
acrylic
acid
sodium
acrylate
recovery method
random copolymer
average molecular
aqueous systems
tertiary oil
minor amounts
oil recovery
alkali metal
molecular weight
minor amount
highly effective
mobility control
unsaturated monomers
additionally contain
acrylic acid
olefinically unsaturated
n-substituted acrylamides
control agent
n-substituted acrylamide
unsaturated monomer
calcium-tolerant n-substituted
/526/