Increasing the viscosity of CO.sub.2 solutions

Details Increasing the viscosity of CO.sub.2 solutions Increasing the viscosity of CO.sub.2 solutions

1989-11-30

1991-09-03

Stoll, Robert L.

Compositions

Leather or fur treating

252364, E21B 4322

Patent

active

050452207

ABSTRACT:
A method of increasing the viscosity of CO.sub.2 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 CO.sub.2 at 25.degree. C. and 900 psig, and (b) forming a one-phase mixture with the polymer when the mixture contains 10 weight percent cosolvent at ambient temperature and a pressure sufficient to maintain the cosolvent in the liquid phase. New compositions containing CO.sub.2, the defined polymer and cosolvent are also claimed as is a method for recovering oil from underground formations using a viscosified CO.sub.2.

REFERENCES:
patent: 3703486 (1972-11-01), Keil
patent: 4404112 (1983-09-01), Scherubel et al.
patent: 4609043 (1986-09-01), Cullick
patent: 4913235 (1990-04-01), Harris et al.

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