Matkivskyi S. Improvement of the technology for the development of natural gas fields in a water drive

The main Eclipse and Petrel hydrodynamic modeling tools from Schlumberger were used to investigate the features of the development of a gas condensate reservoir under a water drive and to develop optimal ways to increase hydrocarbon recovery. Using the research results, the rational value of the duration of the period of injection of carbon dioxide into the productive reservoir at the boundary of the initial gas-water contact is justified, which is 16-17 months. In the case of cyclical injection of carbon dioxide, the rational value for the duration of the injection cycle is 8 months. Based on the simulation results, the maximum value of the density (number) of the grid of injection wells necessary for the injection of carbon dioxide into the gas condensate reservoir at the boundary of the initial gas-water contact was established. According to the results of the calculations, the maximum value of the number of injection wells for a homogeneous reservoir is 6.41 (6) wells (the ratio of the distance between injection wells to the distance between production wells is 1.29). During the injection of carbon dioxide into a heterogeneous multilayer gas condensate reservoir, the maximum value of the number of injection wells is 7.74 (8) wells (the ratio of the distance between injection wells to the distance between production wells is 0.97). Based on the research results, a rational value of the rate of natural gas production was established when injecting carbon dioxide into the reservoir in order to slow down the flow of formation water and prevent premature watering of production wells. According to the calculations, the optimal ratio of the rate of natural gas production to the rate of injection of carbon dioxide is 0.93. Based on the results of the studies carried out, the rational value of the rate of injection of carbon dioxide into the reservoir at the initial gas-water contact is also justified. The rational ratio of the rate of injection of carbon dioxide to the rate of production of natural gas is 1.25. Based on the results of the studies carried out using a digital three-dimensional model of a gas condensate reservoir, technologies have been developed to increase the gas recovery factor in a water drive by injecting carbon dioxide. The technology of carbon dioxide injection has been tested in order to regulate the watering of gas-saturated intervals of productive horizons for the conditions of the V-16 horizon of the Hadyach oil and gas condensate field. According to the research results, thanks to the introduction of the technology under study, the gas recovery factor of the V-16 horizon is increased by 2.95 %. Condensate recovery factor is increased by 1.24%. The results of the conducted studies indicate the technological efficiency of the implementation of the technology of injection of carbon dioxide in order to regulate the process of flooding of productive reservoir and increase the final coefficient of hydrocarbon recovery.