Wells – Processes – Cleaning or unloading well
Patent
1991-08-16
1993-02-02
Suchfield, George A.
Wells
Processes
Cleaning or unloading well
1663051, 166309, 166311, E21B 3302
Patent
active
051831120
ABSTRACT:
Alkaline earth metal scales, especially barium sulfate scale is removed from a well (the wellbore and the adjacent formation) by contacting the scale with a scale-removing solvent and thereafter sparging the solvent with air or insert gas to dissolve the scale. The sparging aids in achieving a flushing action by the solvent relative to the scale thereby enabling the solvent to more effectively dissolve the scale in the well. Temperature and caustic compatible surfactuants (anionic and non-ionic) may be used in the solvent to generate a column of foam which increases the extent of cleaning oil from the scale surfaces, enabling the solvent to more effectively remove the scale.
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Bossler, Robert B. et al., "Chemical and Mechanical Treatment of Water-Input Wells", Secondary Recovery of Oil in the United States, Pub. by API, 2nd Ed. 1950, pp. 363-369.
Morris Richard L.
Paul James M.
Hager Jr. George W.
McKillop Alexander J.
Miller Lawrence O.
Mobil Oil Corporation
Suchfield George A.
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