Scale inhibitors compatible with sandstone acidizing
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United States of America Patent
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Apr 27, 2010
Grant Date -
Jul 12, 2007
app pub date -
Jul 18, 2006
filing date -
Aug 10, 2005
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Abstract
Methods are given for making scale inhibitors, that were previously incompatible with fluids containing fluoride ion, compatible with fluids containing fluoride ion. Examples of such scale inhibitors include phosphonates and phosphino-polycarboxylates. The method is replacing alkali metal and alkaline earth metal cations, present in salts or bases, or as counter ions of the scale inhibitors, with hydrogen or ammonium ions. Methods of inhibiting scale formation and of dissolving scales are also given.
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