Oil recovery using co _flooding

Details Oil recovery using co _flooding Oil recovery using co _flooding

E - Fixed Constructions

21

B

31/14

E21B 43/22 (2006.01) C09K 8/594 (2006.01) E21B 43/16 (2006.01)

Patent

CA 1335154

A method of increasing the viscosity of CO2 at least three-fold by adding (1) a viscosifying amount of a polymer having a Minimum Solubility Parameter of 6.85 or less and a plurality of electron donor atoms selected from the group consisting of O, N, and S, and (2) a sufficient amount of a cosolvent to form a one-phase solution, said cosolvent being capable of (a) dissolving at least 2% by weight of CO2 at 25°C. and 900 psig, and (b) forming a one-phase mixture with the polymer when the mixture contains 10 weight percent cosolvent at ambient tempera- ture and a pressure sufficient to maintain the cosolvent in the liquid phase. New compositions containing CO2, the defined polymer and cosolvent are also claimed as is a method for recovering oil from underground formations using a viscosified CO2.

567936

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