Polymers useful in the recovery and processing of natural...

Details Polymers useful in the recovery and processing of natural... Polymers useful in the recovery and processing of natural...

E - Fixed Constructions

21

B

31/22

E21B 43/22 (2006.01) C08F 226/06 (2006.01) C09K 8/24 (2006.01) C09K 8/588 (2006.01) C09K 8/592 (2006.01) C09K 8/62 (2006.01) E21B 43/24 (2006.01) E21B 43/25 (2006.01)

Patent

CA 1254026

ABSTRACT Water-soluble polymers comprising an N-vinyl lactam are found to be useful in processes wherein the polymer is introduced into a subterranean wellbore. Polymers useful in the recovery of natural resources are prepared by polymerizing an N-Vinyl lactam by free radical initiation with polymerization conducted in an aqueous solution polymerization medium preferably containing a mixture of dissolved electrolytes, or in a polymerization medium consisting essentially of a tertiary alkanol. Copolymers of such N-Vinyl lactams with unsaturated amides, and terpolymers prepared by polymerizing an N-Vinyl lactam and an unsaturated amide with a selected termonomer compound are also useful when prepared by these methods. The invention also broadly encompasses utilizing a water soluble polymer comprising at least one of a hydrophilic vinyl-containing sulfonate and a hydrophilic N-vinyl lactam under hostile conditions.

446172

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