METHOD AND COMPOSITION FOR TERTIARY METHOD OF HYDROCARBONS PRODUCTION Russian patent published in 2015 - IPC C09K8/588 E21B43/16 

FIELD: oil and gas industry.

SUBSTANCE: invention mainly relates to methods of hydrocarbons production from hydrocarbons containing reservoirs. Method of treatment of the reservoir containing crude oil including stages when: (a) composition is supplied to extract the hydrocarbons to at least part of the reservoir, at that the composition contains at least two internal olefin sulphonates selected from group comprising internal C_15-18-olefin sulphonates, internal C_19-23-olefin sulphonates, internal C_20-24-olefin sulphonates and internal C_24-28-olefin sulphonates, and at least one viscosity decreasing compound, that is isobutyl alcohol, ethoxylated C₂-C₁₂-alhohol, 2-butoxyethyl, butyl ether of diethylene glycol or their mixture, and (b) composition is provided with possibility to react with the reservoir hydrocarbons. Invention also relates to method of viscosity decreasing of composition of highly active surface-active substance and composition for hydrocarbons extraction.

EFFECT: result is creation of more effective method of hydrocarbons extraction from crude oil containing reservoir.

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