Methods and aqueous acid solutions for acidizing wells...

E - Fixed Constructions – 21 – B

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E21B 43/27 (2006.01) E21B 41/02 (2006.01)

Patent

CA 2575012

Methods and aqueous acid solutions for acidizing wells containing sludging and emulsifying oil are disclosed. An aqueous acid solution of the invention comprises water, hydrochloric acid, a cationic hydrochloric acid corrosion inhibitor and a conjugate ion pair of a cationic amine oxide surfactant and an anionic surfactant that does not react with the cationic hydrochloric acid corrosion inhibitor.

La présente invention a pour objet des méthodes et des solutions aqueuses acides destinées à l'acidification de puits contenant des huiles émulsifiantes ou formant de la boue. Dans la présente invention, une solution aqueuse acide est constituée d'eau, d'acide chlorhydrique, d'un inhibiteur cationique de corrosion par l'acide chlorhydrique, ainsi que d'une paire d'ions conjugués composée d'un tensioactif cationique de type oxyde d'amine et d'un tensioactif anionique qui ne réagit pas avec l'inhibiteur cationique de corrosion par l'acide chlorhydrique.

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