Method for removing alkaline sulfate scale

Details Method for removing alkaline sulfate scale Method for removing alkaline sulfate scale

1989-06-22

1990-12-25

Lieberman, Paul

Compositions

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

252 80, 252175, 252180, 134 2, 134 3, C02F 508, C02F 510, C23F 1110

Patent

active

049800779

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.

REFERENCES:
patent: 3625761 (1971-12-01), Tate
patent: 3956164 (1976-05-01), Walker et al.
patent: 4030548 (1977-06-01), Richardson et al.
patent: 4276185 (1981-06-01), Martin
patent: 4652377 (1987-03-01), Amjad
patent: 4726907 (1988-02-01), D'Muhala et al.

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