Sulfate scale dissolution

Details Sulfate scale dissolution Sulfate scale dissolution

1990-11-09

1991-09-17

Willis, Prince E.

Compositions

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

252 81, 252180, 252181, 252178, 210696, 166279, 166257, 166270, C02F 508, C23F 1100, F21B 4324, B03D 306

Patent

active

050492977

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, preferably about 11 to 13, of a polyaminopolycarboxylic acid, preferably EDTA or DTPA and a catalyst or synergist comprising thiosulfate or nitriloacetate anions. When the scale-removing solution is contacted with a surface containing a scale deposit, substantially more scale is dissolved at a faster rate than is possible without the synergist.

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