Foamed nitrogen in liquid co2 for fracturing

Details Foamed nitrogen in liquid co2 for fracturing Foamed nitrogen in liquid co2 for fracturing

E - Fixed Constructions

21

B

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

Patent

CA 2356081

A method for fracturing subterranean formations surrounding oil and gas wells using a fracturing fluid consisting of a foam constituted by a liquid phase and a gaseous phase. The liquid phase has a foam forming substance dissolved therein. The foam forming substance is preferably a surfactant such as a non-ionic hydrofluoroether surfactant. The liquid phase is preferably CO2 and the gaseous phase N2.

Cette invention concerne un procédé de fracturation des formations géologiques souterraines qui entourent les puits de gaz et de pétrole, lequel consiste à utiliser un fluide de fracturation qui se compose d'une mousse comprenant une phase liquide et une phase gazeuse. Une substance formatrice de mousse est dissoute dans la phase liquide, laquelle substance consiste de préférence en un tensioactif tel qu'un tensioactif à base d'hydrofluoroéther non ionique. La phase liquide se compose de préférence de CO>2<, tandis que la phase gazeuse se compose de préférence de N>2<.

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