Cleaning and liquid contact with solids – Processes – For metallic – siliceous – or calcareous basework – including...
Patent
1989-11-03
1992-01-28
Howard, Jacqueline V.
Cleaning and liquid contact with solids
Processes
For metallic, siliceous, or calcareous basework, including...
252 80, 252 82, 252175, 252180, 210698, C23G 102, C02F 100, C02F 510
Patent
active
050841050
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 a monocarboxylic acid, preferably a substituted acetic acid such as mercaptoacetic, hydroxyacetic acid or aminoacetic acid or an aromatic acid such as salicylic acid. 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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Morris Richard L.
Paul James M.
Howard Jacqueline V.
Keen Malcolm D.
McKillop Alexander J.
Mobil Oil Corporation
Silbermann J.
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