FIELD: oil and gas production. SUBSTANCE: composition appropriate, in particular, to intensify inflow of formation fluid by way of acid treatment of terrigenous reservoirs contains ammonium bifluoride or bifluoride-fluoride, sulfamic acid in equimolar proportion, water, and, additionally, 0.5-0.7% of lignosulfates. EFFECT: increased heat resistance of acid composition for treatment of deep-seated terrigenous reservoirs. 2 tbl
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