ACIDISING COMPOSITION FOR BOTTOMHOLE FORMATION ZONE Russian patent published in 2010 - IPC C09K8/76 

FIELD: oil and gas production.

SUBSTANCE: invention can be used in well development for processing carbonate reservoirs in a bottomhole formation zone. An acidising composition for the bottomhole formation zone additionally contains an inhibitor characterised by interphasial tension at the hydrocarbon boundary with the acid inhibited with said inhibitor no more than 2 mN/m and providing protective properties in relation to acid corrosion rate no more than 0.2 g/m² at 20°C, contains, wt %: a reaction product of tertiary amines with hydrogen peroxide 0.03-0.3; acetic acid 2.5-3; hydrochloric acid 10.0-24.0; said corrosion inhibitor 0.2-1; water - the rest.

EFFECT: lower corrosion activity with simultaneously increasing penetrability of the composition in a zone, prevented preparation of acid-oil emulsion and enabled dispersion of asphalt, resin and paraffin deposits due to low interphasial tension at the boundary with oil with simultaneous elimination of formation of ferrous stabilisers of oil emulsions.

2 cl, 1 tbl, 1 ex