FIELD: oil and gas production. SUBSTANCE: composition destroying oil emulsions and simultaneously protecting equipment against asphaltene-tar-paraffin deposits contains , wt %: product of condensation of C14-C12-alkylphenol with high-boiling by-product from isobutylene-formaldehyde(or 4,4-dimethyl-1,3-dioxane)-based isoprene production, 10-30; block copolymer of glycol-based ethylene and propylene oxides, 10-30; product of interaction of toluylenediisocyanate with polyether prepared by oxyalkylenation of glycol, 5-15; solvent, the balance. Composition uptake is 25-75 g per 1 t of oil. Residual water content in treated oil is up to 0.16-0.25% and protective effect against hydrogen sulfide corrosion is 79-83%. Portion of equipment surface washed clean of deposits is 98-100%. EFFECT: improved working characteristics. 2 tbl, 18 ex
