Surfactant mixtures for tertiary oil recovery

Details Surfactant mixtures for tertiary oil recovery Surfactant mixtures for tertiary oil recovery

C - Chemistry, Metallurgy

09

K

C09K 8/584 (2006.01) C09K 8/588 (2006.01) E21B 43/22 (2006.01)

Patent

CA 2610758

The invention relates to the use of a mixture containing a surfactant and a cosurfactant in the form of an aqueous solution for flooding underground hydrocarbon fields in order to mobilise and extract hydrocarbons therefrom, wherein the cosurfactant is embodied in the form of a substance or the group of substances selected from an amphiphilic comb polymer comprising a backbone which is provided with two or more side chains which differ from each other and/or from the backbone in terms of the amphiphilic character thereof, the amphiphilic polymer comprises one or several hydrophobic sub-groups [A2] based on a polyisobutene block, wherein at least 50 Mol % of polyisobutene macromolecules have terminal double bonds and one or several hydrophobic sub- groups [A2] or an amphiphilic polymer of a general structural formula (I).

L'invention concerne l'utilisation d'un mélange contenant un tensioactif et un co-tensioactif en tant que solution aqueuse pour inonder des gisements souterrains d'hydrocarbures afin de mobiliser et d'extraire les hydrocarbures des gisements souterrains. Selon l'invention, le co-tensioactif est une substance ou un groupe de substances sélectionné parmi : un polymère amphiphile à structure en peigne, présentant un squelette à deux ou plusieurs chaînes latérales, les chaînes latérales se distinguant entre elles et/ou se distinguant du squelette dans leur caractère amphiphile, un polymère amphiphile présentant une ou plusieurs sous-unités hydrophobes [A2] à base d'un bloc polyisobutène dont les macromolécules polyisobutène présentent au moins 50 % en moles de liaisons doubles situées aux extrémités, ainsi qu'une ou plusieurs sous-unités hydrophiles [B2], ou un polymère amphiphile de formule développée générale (I).

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