Composition and method for improving oil recovery

E - Fixed Constructions – 21 – B

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E21B 43/27 (2006.01) C09K 3/32 (2006.01) C09K 8/34 (2006.01) C09K 8/52 (2006.01) C09K 8/74 (2006.01) E21B 37/06 (2006.01)

Patent

CA 2471137

A method and composition are described for improving recovery of oil from an oil reservoir. The method includes adding an effective amount of a fatty acid alkyl ester oil recovery composition to an oil reservoir and recovering oil from the reservoir. A composition including in predominant proportion a fatty acid alkyl ester as well as effective concentrations of a surfactant and/or colloid, and an acid. One exemplary composition includes 96% soy methyl ester, 3% surfactant, and 1% vinegar. A method for improving recovery of oil from an oil reservoir including adding a composition including a fatty acid alkyl ester, a surfactant and/or colloid, and an acid. Also methods for breaking an oil-water emulsion and a method for cleaning oil-contaminated soil, objects and wildlife.

L'invention concerne un procédé et une composition permettant d'améliorer la récupération de pétrole à partir d'un réservoir de pétrole. Ledit procédé consiste à ajouter une quantité efficace d'une composition de récupération de pétrole à base d'ester d'alkyle d'acide gras à un réservoir et à récupérer le pétrole provenant dudit réservoir. L'invention concerne également une composition comprenant une proportion prédominante d'ester d'alkyle d'acide gras ainsi que des concentrations efficaces de tensioactif et/ou de colloïde et un acide. Une composition exemplaire comprend 96 % d'ester de méthyle de soja, 3 % de tensioactif et 1 % de vinaigre. L'invention concerne, en outre, un procédé permettant d'améliorer la récupération de pétrole à partir d'un réservoir qui consiste à ajouter une composition renfermant un ester d'alkyle d'acide gras, un tensioactif et/ou un colloïde et un acide. L'invention concerne enfin des procédés permettant de rompre une émulsion huile dans l'eau et un procédé permettant de nettoyer un sol, des objets et la faune contaminés par du pétrole.

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