Copolymers of n,n-dimethylacrylamide and acrylamide

Patent · Tue Apr 27 04:00:00 EDT 1982

OSTI ID:5810217

Cottrell, I W; Baird, J K; Shim, J L

Water-soluble, high molecular weight, hydrolyzed NNDMA:AM (N,N-dimethylacrylamide/acryla copolymers having from 5 to 65% of the original carboxamide groups hydrolyzed to carboxyl groups are used for preparing viscous aqueous compositions for use in the secondary recovery of petroleum. The sweeping or driving of petroleum from underground formations uses aqueous compositions rendered more viscous by the incorporation of these copolymers. The copolymers are adsorbed in underground strata to only a minimal extent and are not rendered insoluble by the presence in the solution of concentrations of calcium ions and sodium ions such as are commonly encountered in oil field brines. This method is applicable both to linear and cross-linked copolymers of acrylamide and N,N-dimethylacrylamide, and to the hydrolysis products of these copolymers. 5 claims.

• Assignee: Merck and Co. Inc.
• Patent Number(s): US 4326970
• OSTI ID: 5810217
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ACRYLAMIDE
ADDITIVES
AMIDES
AQUEOUS SOLUTIONS
COPOLYMERS
DISPERSIONS
ENERGY SOURCES
ENHANCED RECOVERY
FLUID INJECTION
FOSSIL FUELS
FUELS
MIXTURES
OIL WELLS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
PETROLEUM
POLYMERS
RECOVERY
SOLUBILITY
SOLUTIONS
VISCOSITY
WATERFLOODING
WELLS