Wells – Processes – Distinct – separate injection and producing wells
Patent
1991-12-10
1993-02-16
Suchfield, George A.
Wells
Processes
Distinct, separate injection and producing wells
166274, E21B 4322
Patent
active
051862573
ABSTRACT:
Water-soluble polymers comprising N-vinyl amide such as 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, phosphonate or ester and/or hydrophilic N-vinyl lactam for applications under hostile conditions.
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Bjornson Geir
Hedges James H.
Hsieh Henry L.
Moradi-Araghi Ahmad
Stahl Allan
Haag Gary L.
Phillips Petroleum Company
Suchfield George A.
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