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US 11,313,800 B2Granted
Method for detecting and quantifying additives used in the enhanced recovery of oil and shale gas
AssigneesTotal SA, Universite Claude Bernard Lyon 1, Centre National De La Recherche Scientifique
InventorsMattéo Martini, Olivier Tillement, Arthur Marais, Christian Hurtevent, Stéphane Jouenne
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Abstract
A method for the detection and quantification, in a complex aqueous fluid, of additives and water-soluble polymers used in the enhanced recovery of oil and shale gas.
Claims11
A method for detecting additives used in the enhanced recovery of oil and shale gas, in injection water or production water, said method comprising:
- a. mixing a detecting solution comprising at least one lanthanide cation and optionally a chelating agent of the lanthanides, with a sample of injection water or of production water to be analysed comprising at least one additive used in the enhanced recovery of oil and shale gas, under conditions allowing complexing of the lanthanide by the additive present,
- b. detecting and, if appropriate, quantifying the variation in fluorescence associated with the presence of the additive in the injection water or the production water by time-resolved fluorescence,
- wherein the additive used in the enhanced recovery of oil and shale gas is a water-soluble polymer having a molecular weight between 1 MDa and 30 MDa.
Dependencies are inferred from the claim text.