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Link for citation: Korotkov R.N., Konovalov A.A., Ovcharenko D.M., Erofeev V.I. Binary mixture technology as a modern complex method of increasing oil recovery for the development of hard-to-recover reserves in the fields of Western Siberia. Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 9, рр. 146-153. In Rus. The relevance of the study is caused by the current situation, when subsoil users are trying to extract the maximum amount of oil in a short time, as a result of which the development system is mainly compiled incorrectly, the share of hard-to-recover reserves is growing every year. Therefore, there is an urgent need to develop residual reserves from the subsoil, which are often difficult to recover. One of the complex reservoir stimulation is thermal-gas-chemical stimulation, which is a method of extensive reservoir stimulation and describes a promising technology among other existing methods for enhanced oil recovery. Binary mixtures, in their turn, will increase oil recovery by an average of 5–10 %. Purpose: to study the effectiveness of the application of binary systems technology in order to increase oil recovery from reservoirs containing hard-to-recover hydrocarbon reserves. Methods: systematization of classification approaches in terms of hard-to-recover reserves, selection of the most relevant methods of enhanced oil recovery according to the efficiency criterion, analysis of Russian and foreign experience in the use of thermal-gas-chemical treatment, assessment of the technological and economic feasibility of using binary mixtures in analogous fields. Results. The use of binary mixtures makes it possible to increase oil recovery by 5–10 % on average. The principles of oil displacement using ammonium nitrate and the decomposition reaction product were studied, an analysis of pilot industrial tests both in Russia and abroad was reproduced, and current issues were studied. Various fields are also considered, which have already proved the positive dynamics of the development potential when using this technology. A preliminary assessment of the economic efficiency of thermal-gas-chemical treatment in the current state of the gas and oil industry in comparison with other methods of enhanced oil recovery is presented.