Using the main tools of hydrodynamic modeling, a study of the process of carbon dioxide injection into the reservoir at the boundary of the initial gas-water contact has been carried out in order to slow down the flow of formation water into gas-saturated horizons. The calculations have been carried out for various values of the carbon dioxide injection period duration (12, 14, 16, 18, 21, 24 months). Based on the results of the carried-out studies, it has been found that due to the introduction of the carbon dioxide injection technology, the formation pressure in the reservoir is maintained at a higher level compared to depletion development. The simulation results show that with an increase in the duration of the carbon dioxide injection period, the duration of the production wells’ operation period decreases until the moment of CO2 breakthrough into the production wells. Based on the results of the carried-out studies, the dependence of the accumulated hydrocarbons production on the period duration of carbon dioxide injection into the productive reservoir has been established. With an increase in the injection period duration of non-hydrocarbon gas, the accumulated production of gas and condensate decreases, and the volumes of produced water production also sharply decrease. The studies’ results indicate the high technological efficiency of using hydrocarbon dioxide as an injection agent to regulate the process of formation water flow into productive reservoirs. Based on the studies’ results, the optimal duration value of the period of carbon dioxide injection into the reservoir has been determined, which at the time of its breakthrough into a number of production wells is 16.32 months. The gas recovery factor for the given value of the duration of the injection period is 61.98 %. The results of the studies indicate the high technological efficiency of carbon dioxide injection into the reservoirs, which are developed under the conditions of the water drive manifestation to regulate the process of productive reservoirs’ watering and increase their final hydrocarbon recovery
Received 13.10.2021
Revised 07.02.2022
Accepted 01.03.2022
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