Topical viscosity control for light hydrocarbon displacing fluid

Details Topical viscosity control for light hydrocarbon displacing fluid Topical viscosity control for light hydrocarbon displacing fluid

1985-08-30

1986-08-26

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166308, 252 8551, 252 8554, E21B 4322

Patent

active

046076964

ABSTRACT:
Solvent-type flooding fluids comprising light hydrocarbons in the range of ethane to hexane (and mixtures thereof) are used to displace crude oil in formations having temperatures of about 20 degrees to about 150 degrees Centigrade and pressures above about 650 psi, the light hydrocarbons having dissolved therein from about 0.05% to about 3% of an organotin compound of the formula R.sub.3 SnF where each R is independently an alkyl, aryl or alkyaryl group from 3 to 12 carbon atoms. Under the pressures and temperatures described, the organotin compounds become pentacoordinated and linked through the electronegative bridges, forming polymers within the light hydrocarbon flooding media to render them highly viscous. Under ambient conditions, the viscosity control agents will not readily be produced from the formation with either crude oil or water, since they are insoluble in the former and only sparingly soluble in the latter.

REFERENCES:
patent: 3410797 (1968-11-01), Walker et al.

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