Study of the efficiency of regulation of the process of waterflooding of gas-condensate reservoirs of the Hadiach field using carbon dioxide

• Main Author: S. V. Matkivskyi
• Format: Article
• Language: English
• Published: Ukrainian State Geological Research Institute (UkrSGRI) 2021-08-01
• Series: Мінеральні ресурси України
• Subjects: digital model; field; gas condensate reservoir; water drive; waterflooding; technologies; injection of carbon dioxide; hydrocarbon recovery factor
• Online Access: https://mru-journal.com.ua/index.php/mru/article/view/312
• ISSN: 1682-721X; 2707-8698

To improve the existing technologies for the development of hydrocarbon reservoirs in the conditions of the manifestation of a water drive, the study of the effectiveness of regulating the flow of formation water into productive reservoirs by injection of carbon dioxide was carried out. The study was carried out using the basic tools of hydrodynamic modeling based on a digital three-dimensional model of a gas condensate field. Based on the results of the studies, it was found that in the case of injection of non-hydrocarbon gas in a gas condensate reservoir, the reservoir pressure is maintained at a higher level compared to depletion development. This ensures the creation of an additional hydrodynamic barrier in the injection zone, partially blocks and prevents the movement of formation water into gas-saturated horizons. Based on the studies carried out, it was found that the injection of carbon dioxide into the reservoir leads to a decrease in the volume of produced water production in comparison with depletion development. Owing to the introduction of the studied technology of secondary hydrocarbon production, stable and waterless operation of production wells is ensured for a long period of additional development of the reservoir. Based on the results of the analysis of the main technological indicators of the reservoir development, it should be noted that due to the introduction of the technology under study, additional gas and condensate production is provided. The predicted gas recovery factor at the time of the injection agent breakthrough in production wells increases by 2,95 % compared to the depletion development option in terms of residual gas reserves, while the condensate recovery factor increases by 1,24 %. Based on the simulation results, it can be argued that the introduction of carbon dioxide injection technology minimizes the negative impact of edge waters on the hydrocarbon production process and ensures an increase in the final hydrocarbon recovery factors.