Fracturing method for stimulation of wells utilizing carbon...

Details Fracturing method for stimulation of wells utilizing carbon... Fracturing method for stimulation of wells utilizing carbon...

E - Fixed Constructions

21

B

31/14, 166/22

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

Patent

CA 1241826

FRACTURING METHOD FOR STIMULATION OF WELLS UTILIZING CARBON DIOXIDE BASED FLUIDS Abstract of the Disclosure A method of fracturing a subterranean formation with a stabilized foamed fracturing fluid comprising from about 30 percent to in excess of about 95 percent by volume of carbon dioxide with the remainder comprising a substantially anhydrous liquid and a selected surfactant. The foam is formed in situ by injection of a stabilized liquid-liquid emulsion containing liquid carbon dioxide into a well bore penetrating the formation. The temperature and pressure of the emulsion is controlled to maintain the carbon dioxide in the liquid phase during injection into the well bore. Thereafter, the carbon dioxide is heated by the subterranean formation to a temperature above about 88° F. at which time the stabilized emulsion spontaneously forms a high quality stabilized foam. -25-

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