METHOD FOR BOTTOMHOLE ZONE OF TERRIGENOUS FORMATION TREATMENT Russian patent published in 2006 - IPC E21B43/27 

FIELD: production of liquid and gaseous media from wells, particularly to treat oil production and injection well bottom zones.

SUBSTANCE: method involves delivering hydrochloric acid solution to well bottom zone by forcing thereof with oil; forming hydrochloric acid solution bath at well head; forcing hydrochloric acid solution into bottom zone; performing swabbing operation via flow string without exercising technological time-delay for acid reaction conduction; delivering hydrofluoric solution to bottom zone, wherein hydrofluoric solution includes mixture of hydrochloric and hydrofluoric acids, as well as surfactant additive; carrying out technological time-delay for 1-2 hours; performing swabbing operation via flow string to reach design well deliverability.

EFFECT: increased efficiency of bottomhole zone treatment.

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