FIELD: oil producing industry, particularly, compositions for acid treatment of oil well bottomhole formation zones. SUBSTANCE: composition includes hydrochloric acid, auxiliary acid, organic solvent and water. Organic solvent is used in form of butyl cellulose. Auxiliary acid is used in form of acetic or hydrofluoric acid. Hydrochloric acid to auxiliary acid ratio is (3.5-5.5): 1. Composition has the following amounts of components, wt.%: hydrochloric acid 6.5-13; acetic or hydrofluoric acid 1.5-3.0; butyl cellosolve 3.0-15.0; the balance, water. EFFECT: provided composition with high efficiency for stimulation of low- permeability reservoirs.
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