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

Patent · Tue Mar 10 04:00:00 EST 1987

OSTI ID:7262638

McCormick, C L; Blackmon, K P

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: Univ. of Southern Mississippi, Hattiesburg, MS (United States)
• Patent Number(s): US 4649183; A
• Application Number: PPN: US 6-807405
• OSTI ID: 7262638
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ACRYLAMIDE
ADDITIVES
AMIDES
CHEMICAL COMPOSITION
DISPLACEMENT FLUIDS
ENERGY SOURCES
ENHANCED RECOVERY
FLUID INJECTION
FLUIDS
FOSSIL FUELS
FUELS
OIL WELLS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PETROLEUM
POLYMERS
VISCOSITY
WATERFLOODING
WELLS