Enhanced oil recovery with high molecular weight...

Details Enhanced oil recovery with high molecular weight... Enhanced oil recovery with high molecular weight...

E - Fixed Constructions

21

B

31/23

E21B 43/22 (2006.01) C09K 8/588 (2006.01) C09K 8/62 (2006.01) C09K 8/72 (2006.01)

Patent

CA 2006981

ABSTRACT The recovery of oil or gas from underground porous formations bearing such hydrocarbons is enhanced by using an injection fluid containing a viscosifying amount of a poly(vinylamine) formed in-situ by hydrolysis of a high molecular weight poly(N-vinylamide). The hydrolysis conditions are strongly acidic or highly alkaline and include the elevated temperature of the formation. The poly(N-vinylamide), such as poly(N-vinylformamide), can be made by inverse emulsion polymerization and the high solids emulsion mixed directly with the acidic or basic solutions to form the injection fluid. The process is applicable to enhanced oil recovery using fluids for water-flooding, well completion or workover, and acidifying or fracturing.

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