Method for preventing the formation of sludge in crude oil

Wells – Processes – Material placed in pores of formation to treat resident...

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166304, 166307, 252 8552, 252 8553, E21B 4327

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active

050586785

ABSTRACT:
An aqueous acidic composition useful for conducting a formation acidizing method is disclosed. The composition, which is comprised of a blend of acetic acid, formic acid, a fatty alkyl quaternary ammonium salt, a fatty aralkyl quaternary ammonium salt and an alkanoic and/or alkenoic acid having at least four carbon atoms and at least two alcoholic hydroxyl groups per molecule, resists the formation of sludge, and insoluble ferric and calcium compounds.

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