Methods of reducing subterranean formation water permeability

E - Fixed Constructions – 21 – B

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E21B 43/22 (2006.01) C09K 8/12 (2006.01) C09K 8/508 (2006.01)

Patent

CA 2357844

Improved methods of treating water and hydrocarbon producing subterranean formations to reduce the water permeability thereof are provided. The methods basically comprise introducing into the formation a water flow resisting chemical which attaches to adsorption sites on surfaces within the porosity of the formation and reduces the water permeability thereof without substantially reducing the hydrocarbon permeability thereof. The water flow resisting chemical is comprised of a polymer of at least one hydrophilic monomer and at least one hydrophobically modified hydrophilic monomer.

L'invention concerne des méthodes améliorées de traitement des formations souterraines produisant de l'eau et de l'hydrocarbure pour réduire la perméabilité à l'eau de ces dernières. Les méthodes consistent essentiellement à introduire dans la formation un produit chimique résistant à l'écoulement de l'eau qui s'attache à des sites d'adsorption sur des surfaces dans la porosité de la formation et qui réduit la perméabilité à l'eau de celle-ci sans en réduire considérablement la perméabilité à l'hydrocarbure. Le produit chimique résistant à l'écoulement de l'eau est composé d'un polymère d'au moins un monomère hydrophile et d'au moins un monomère hydrophile modifié de manière hydrophobe.

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