Sulfate scale dissolution

Details Sulfate scale dissolution Sulfate scale dissolution

C - Chemistry, Metallurgy

23

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149/26, 31/32

C23G 1/14 (2006.01) B09C 1/02 (2006.01) C02F 5/08 (2006.01) C02F 5/10 (2006.01) C02F 5/12 (2006.01) C09K 8/528 (2006.01) E21B 37/06 (2006.01) E21B 43/28 (2006.01) G21F 9/00 (2006.01)

Patent

CA 2030541

Alkaline earth metal scales, especially barium sulfate scale deposits are removed from oilfield pipe and other tubular goods with a scale-removing composition comprising an aqueous alkaline solution having a pH of about 8 to about 14, preferably about 11 to 13, of a polyaminopolycarboxylic acid, preferably EDTA or DTFA and a catalyst or synergist comprising, in particular, oxalate, thiosulfate, nitriloacetate or monocarboxylic acid anions. When the scale-removing solution is contacted with a surface containing a scale deposit, substantially more scale is dissolved at a faster race than is possible without the synergist.

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