Carbon dioxide systems for hydraulic fracturing of...

Details Carbon dioxide systems for hydraulic fracturing of... Carbon dioxide systems for hydraulic fracturing of...

E - Fixed Constructions

21

B

31/14

E21B 43/26 (2006.01) C09K 8/70 (2006.01)

Patent

CA 1301443

ABSTRACT "Carbon Dioxide Systems for Hydraulic Fracturing of Hydrocarbon Reservoirs" A method of fracturing a subterranean formation with a fracturing fluid comprising as a first phase, from 75% to 99.5% by weight of liquid carbon dioxide and, as a second phase, an organic liquid which is not miscible with liquid CO2 and a selected surfactant. The two-phase mixture or combination is prepared on the surface and injected, with or without added proppant, into the subterranean formation. The fluid demonstrates substantially improved viscosity over other known carbon dioxide-based fracture systems.

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