Viscous oil recovery using emulsions

E - Fixed Constructions – 21 – B

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E21B 43/16 (2006.01)

Patent

CA 2717554

The present invention is directed to a method of generating a basic water-in- oil emulsion for use in recovering hy-drocarbons from a subterranean formation. The emulsion may be used to displace hydrocarbons from the formation. The emul-sions used are 'basic' in the sense that they do not have added surfactants and are not solid-stabilized. The emulsions are made us-ing a hydrocarbon having at least one of the following properties: (i) greater than five weight percent (wt%) asphaltene content, (ii) greater than two wt% sulfur content, and (iii) less than 22 dyne/cm interfacial tension between the hydrocarbon liquid and the aqueous liquid.

La présente invention concerne un procédé de génération dune émulsion basique deau dans lhuile destinée à être utilisée pour récupérer des hydrocarbures à partir dune formation souterraine. Lémulsion peut être utilisée pour déplacer des hydrocarbures à partir de la formation. Les émulsions utilisées sont "basiques" dans le sens quelles ne comportent pas de surfactants ajoutés et ne sont pas stabilisées en solide. Les émulsions sont réalisées à laide dun hydrocarbure qui possède au moins une des propriétés suivantes : (i) plus de cinq pour cent en poids (% en poids) dasphaltène, (ii) plus de deux % en poids de soufre et (iii) moins de 22 dyne/cm de tension interfaciale entre le liquide dhydrocarbure et le liquide aqueux.

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