Composition and method for using waxy oil-external emulsions...

C - Chemistry – Metallurgy – 09 – K

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C09K 8/44 (2006.01) E21B 33/13 (2006.01) E21B 33/138 (2006.01)

Patent

CA 2658943

A waxy oil-external emulsion is provided for injection into a selected zone of a subsurface formation. The selected zone is typically a high permeability zone. The emulsion generally comprises oil, added wax, and water. The emulsion may also include an emulsifying agent and a solvent. The emulsion is formulated to be a liquid at a temperature greater than a targeted temperature in the subsurface formation, but a solid at the targeted temperature. The targeted temperature is typically the maximum operating temperature for the formation. A method of formulating the emulsion is also provided. Further, a method of plugging a high permeability zone using the emulsion is disclosed.

L'invention concerne une émulsion à phase externe d'huile paraffineuse pour une injection dans la zone sélectionnée d'une formation souterraine. La zone sélectionnée est typiquement une zone à perméabilité élevée. Une émulsion comprend généralement de l'huile, de la cire ajoutée et de l'eau. L'émulsion peut également comprendre un agent émulsifiant et un solvant. L'émulsion est formulée pour être liquide à une température supérieure à la température ciblée dans la formation souterraine, mais solide à la température ciblée. La température ciblée est typiquement la température opérationnelle maximale de la formation. L'invention concerne également un procédé de formulation de l'émulsion. L'invention concerne en outre un procédé d'obturation d'une zone à perméabilité élevée à l'aide de l'émulsion.

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