Topical viscosity control for light hydrocarbon displacing...

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

E - Fixed Constructions

21

B

31/13

E21B 43/267 (2006.01) C09K 8/58 (2006.01)

Patent

CA 1269227

TOPICAL VISCOSITY CONTROL FOR LIGHT HYDROCARBON DISPLACING FLUIDS IN PETROLEUM RECOVERY AND IN FRACTURING FLUIDS FOR WELL STIMULATION Abastract Solvent-type flooding fluids comprising light hydrocar- bons in the range of ethane to hexane (and mixtures thereof) are used to displace crude oil in formations having tempera- tures 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 organo- tin compound of the formula R3SnF where each R is independ- ently 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 arc insoluble in the former and only sparingly soluble in the latter.

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