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AssigneesRhodia Operations, Ifp Energies Nouvelles
InventorsMax Chabert, Eloise Chevallier
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A method for extracting a crude oil contained in a geological formation comprises a step of fracturing the geological formation, by injection of a specific aqueous extraction fluid under pressure, which contains at least one surfactant that reduces the interfacial tension between the extraction fluid and the crude oil to be extracted to below 0.1 mN/m; followed by a discharge step (“flowback”). Additionally, the original fracturing fluids used in this method, and the additives used in these fracturing fluids include a surfactant or a surfactant mixture which make it possible to reduce the interfacial tension between the fluid and a petroleum oil below 0.1 mN/m.
A process for extracting a petroleum oil contained in a geological formation, said process comprising
A method, comprising using, as a flowback aid, at least one surfactant, in which the at least one surfactant comprises a mixture of a surfactant of sulfonate type with an anionic surfactant of alkoxylated alkyl sulfate type, in an aqueous fracturing fluid, which is capable of lowering the interfacial tension of the aqueous fracturing fluid with decane and/or hexadecane below 0.1 mN/m.
Dependencies are inferred from the claim text.