Method for removing alkaline sulfate scale
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United States of America Patent
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Dec 25, 1990
Grant Date -
N/A
app pub date -
Jun 22, 1989
filing date -
Jun 22, 1989
priority date (Note) -
Expired
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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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