FIELD: oil producing industry. SUBSTANCE: method for production of high-viscosity oil includes injection into formation of dissolving heat carrier. Viscosity of heat carrier is less than that of formation oil. Dissolving heat carrier is used in form of oil fractions with boiling temperature above 210 C. Fractions are taken from oil heat treatment plant, particular, from plant of thermocontact cracking. Temperature of fractions injected into well is 150-300 C. EFFECT: prevented settling of asphalt-resinous substances and losses of useful accompanying metals and increased recovery of high-viscosity oil. 2 cl, 1 dwg
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