Compositions for dissolution of sulfate scales

Details Compositions for dissolution of sulfate scales Compositions for dissolution of sulfate scales

1990-11-16

1993-11-09

Willis, Jr., Prince

Compositions

Dust suppressants for bulk materials, or processes of...

252 80, 252175, 252180, 252 86, C02F 510

Patent

active

052599809

ABSTRACT:
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, a polyaminopolycarboxylic acid, preferably EDTA or DTPA and a catalyst or synergist comprising oxalate anion. When the scale-removing solution is contacted with a surface containing a scale deposit, substantially more scale is dissolved at a faster rate than previously possible.

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Hawley's Condensed Chemical Dictionary, 11th edition, Van Nostrand Rienhold, N.Y. 1987, pp. 391, 486.

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