FIELD: oil and gas production.
SUBSTANCE: composition for acid treatment of well of bottomhole zone of reservoir consists of hydrochloric acid, corrosion inhibitor and water. As corrosion inhibitor there is used waste of benzaldehyde production corresponding to water-salt solution containing wt %: ammonium chloride 10-20, hydrochloric acid aromatic amines 20-30, water - the rest, and additionally - acetic acid at the following ratio of components, wt %: hydrochloric acid of 27.5% concentration 79.9-89.9, waste of benzaldehyde production 10-20, acetic acid 0.1-1.0.
EFFECT: essentially reduced corrosion activity of composition eliminating contamination of reservoir and reduction of its yield, raised efficiency of influence on reservoir by retarded neutralisation of acid solution facilitating more deep penetration into reservoir and its increased oil yield; utilisation of waste of benzaldehyde production.
1 tbl, 1 ex
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