Scale inhibitors compatible with sandstone acidizing

Details Scale inhibitors compatible with sandstone acidizing Scale inhibitors compatible with sandstone acidizing

2011-05-31

2011-05-31

Bates, Zakiya W (Department: 3676)

Wells

Processes

Cleaning or unloading well

C166S307000

Reexamination Certificate

active

07950462

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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