The resource base of hydrocarbon fields in Ukraine is characterized by deterioration in the quality and structure of reserves over time and is accompanied by an increase in the share of hard-to-recover reserves, the development of which is currently being carried out at a very low rate. In the near future, hydrocarbon production in Ukraine will be associated not so much with the introduction of new fields into development, but with an increase in the final recovery factors of old and depleted fields. To establish the effectiveness of the introduction of secondary and tertiary technologies for the development of Ukrainian fields, a study of the technology of injection of carbon dioxide has been carried out on the example of the Hadyach oil and gas condensate field. The results of the studies carried out using the main tools of hydrodynamic modeling has indicated that in the case of the introduction of the carbon dioxide injecting technology into the reservoir of the V-16 horizon, the rates of production of liquid hydrocarbons will stabilize. Due to the high solubility of carbon dioxide in liquid hydrocarbons, an increase in the volume of condensate is achieved, which provides conditions for its filtration. Based on the research results, the forecast condensate recovery factor has been calculated. At the time of the breakthrough of carbon dioxide into production wells, the final condensate recovery factor is 7.92% relative to residual reserves, and in case of depletion development - 6.68%. According to the simulation results, it has been found that in the case of introducing the technology of injecting carbon dioxide into the reservoir of the B-16 horizon, the final condensate recovery factor increases by 1.24%. The practical implementation of secondary and tertiary technologies for the development of depleted oil and gas fields in Ukraine in the broad sense of the problem will significantly intensify the process of hydrocarbon production and reach the global level of solving the problem