Мінеральні ресурси України (May 2022)
Studying the influence of the cycling process duration on the condensate recovery factor of the depleted gas condensate field
Abstract
To increase the efficiency of the development of gas condensate fields with significant reserves of retrograde condensate, studies were carried out using hydrodynamic modeling tools based on a digital three-dimensional model. The aim of the work is to optimize the technology of reservoir pressure maintenance using dry gas. The study was carried out for different period of dry gas injection into the gas condensate reservoir (12, 24, 36, 48 and 60 months). Based on the results of the studies, it was found that due to the implementation of the dry gas injection technology, the reservoir pressure is maintained at a higher level compared to development in the mode of reservoir energy depletion. Thanks to this, the processes of retrograde condensation of liquid hydrocarbons in the reservoir are slowed down, and the technological modes of operation of production wells are also stabilized. Based on the results of the analysis of the technological parameters of the development of a gas condensate reservoir, it was found that in the case of the implementation of the technology for maintaining reservoir pressure, the cumulative production of condensate increases. According to the results of calculations, the accumulated production of condensate, depending on the period of dry gas injection, is: 12 months – 349,7 Th/m³; 24 months – 366,7 Th/m³; 36 months – 377,4 Th/m³; 48 months – 383,6 Th/m³; 60 months – 387,6 Th/m³. The results of the calculations show that the longer the dry gas injection period, the greater the condensate production. According to the results of the studies, based on the analysis of the calculated data, the optimal value of the dry gas injection period into the gas condensate reservoir was established, which is 34.3 months. The final condensate recovery factor, according to the calculation results, increases by 6.06 % for the established optimal dry gas injection period compared to depletion development.
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