Composition and method of removing scale from oil wells

Details Composition and method of removing scale from oil wells Composition and method of removing scale from oil wells

C - Chemistry, Metallurgy

09

K

31/30

C09K 8/528 (2006.01) C02F 5/08 (2006.01)

Patent

CA 1058854

Abstract An aqueous alkaline solution of a chelating compound and a borate salt is used to remove water-insoluble scale deposits from an oil well bore and associated equipment. The solution contains an effective amount of a chelating compound selected from ammonium, amine and alkali metal salts of aminopolycarboxylic acids and a synergistic borate salt selected from the group con- sisting of ammonium, amine and alkali metal borates, tetraborates and metaborates having a greater pH than 8.

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