Method for reducing radioactivity of oilfield tubular goods cont

Details Method for reducing radioactivity of oilfield tubular goods cont Method for reducing radioactivity of oilfield tubular goods cont

1990-11-16

1992-05-12

Suchfield, George A.

Wells

Processes

Cleaning or unloading well

166302, 166303, 1663051, 134 2, 252 8552, 252 80, E21B 3700, E21B 4325, E21B 4328

Patent

active

051118874

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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patent: 4856584 (1989-08-01), Seidner

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