Method for the assisted recovery of hydrocarbons using...

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 8/588 (2006.01)

Patent

CA 2728489

The invention relates to a method for the assisted recovery of hydrocarbons, comprising the injection of aqueous polymer solutions into the reservoir rock, said method comprising the following steps: injection of a first aqueous solution of non-associative hydrophilic polymers into the reservoir in a determined quantity such as to be adsorbed on the reservoir rock; and injection of a second aqueous solution of associative polymers into the reservoir in order to recover hydrocarbons, with limited adsorption on account of the adsorption of the non-associative polymers of the first solution.

La présente invention concerne une méthode de récupération assistée d'hydrocarbures par injection de solutions aqueuses de polymères dans la roche réservoir, dans laquelle on effectue les étapes suivantes: - on injecte une première solution aqueuse de polymères hydrophiles non associatifs dans le réservoir en quantité déterminée pour s'adsorber sur la roche réservoir, - on injecte une seconde solution aqueuse de polymères associatifs dans le réservoir pour la récupération d'hydrocarbures, avec une adsorption limitée compte tenu de radsorption des polymères non associatifs de la première solution.

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