A method for dissolving oilfield scale

Details A method for dissolving oilfield scale A method for dissolving oilfield scale

C - Chemistry, Metallurgy

23

G

C23G 1/00 (2006.01) B08B 3/04 (2006.01) C02F 5/00 (2006.01)

Patent

CA 2646533

A method of removing metal scale from surfaces that includes contacting the surfaces with a first aqueous solution of a chelating agent, allowing the chelating agent to dissolve the metal scale, acidifying the solution to form a precipitant of the chelating agent and a precipitant of the metal from the metal scale, isolating the precipitant of the chelating agent and the precipitant of the metal from the first solution, selectively dissolving the precipitated chelating agent in a second aqueous solution, and removing the precipitated metal from the second solution is disclosed.

L'invention concerne un procédé pour éliminer les dépôts métalliques des surfaces, consistant à faire entrer ces surfaces en contact avec une première solution aqueuse d'agent chélateur, à laisser cet agent chélateur dissoudre les dépôts métalliques, à acidifier la solution pour former une précipité de l'agent chélateur et un précipité du métal provenant des dépôts, à isoler le précipité d'agent chélateur et le précipité de métal de la première solution, à dissoudre sélectivement l'agent chélateur précipité dans une seconde solution aqueuse et à extraire le métal précipité de la seconde solution.

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