Well treating process

Details Well treating process Well treating process

E - Fixed Constructions

21

B

166/25

E21B 43/27 (2006.01) C09K 8/78 (2006.01)

Patent

CA 1116074

? A B S T R A C T In a well-treating process in which an acidic solution having a pH of less than about 2 tends to dissolve ferric ion-containing materials from the well conduits and to precipitate ferric ion- containing solids when the pH of the solution increases beyond about 3, such a precipitation can be prevented by dissolving limited proportions of both 5-sulphosalicylic acid and citric acid within the acidic solution to be injected.

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