FIELD: oil and gas production. SUBSTANCE: composition suitable for removing asphaltene- tar-paraffin deposits from bottom zone of formation, exhaust lines, oil- gathering collectors, and oil-field equipment contains, vol. %: aliphatic hydrocarbons, 25-85; polar nonelectrolyte, 2-5; nonionic surfactant, 1-2; cationic surfactant (object of invention), 1-2; and aromatic hydrocarbons, the balance. EFFECT: increased resistance of composition against hydrocarbon-oxidizing bacteria. 3 tbl
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