COMPOSITION FOR ACID TREATMENT OF WELL OR BOTTOM-HOLE FORMATION ZONE Russian patent published in 2011 - IPC C09K8/74 

FIELD: oil and gas industry.

SUBSTANCE: composition for acid treatment of well or bottom-hole formation zone includes chlorhydric acid, corrosion inhibitor and water. B2 corrosion inhibitor production waste is used as corrosion inhibitor and represents salt aqueous solution containing the following, wt %: ammonium chloride 15-18, aromatic amines 4-5, water is the rest, and B2 corrosion inhibitor at the following component ratio, wt %: chlorhydric acid of 27.5% concentration 80-84.9, B2 corrosion inhibitor production waste 15-20, and B2 corrosion inhibitor 0.05-0.15.

EFFECT: lower corrosive activity of composition, which excludes contamination of formation and lower productivity of formation, higher effectiveness of action on formation by slower neutralisation of acid solution, which provides deeper penetration into formation and higher current reservoir recovery, and utilisation of B2 corrosion inhibitor production waste.

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