PROBLEMS OF APPLYING GAS METHOD OF ENHANCED OIL RECOVERY IN VANKOR OIL FIELD
Relevance of the research is, on the one hand, conditioned by the reduction in effectiveness of oil field development using conventional methods, on the other hand, by climate change agenda, which is aimed at reduction in carbon footprint in production. The global experience has shown the growing demand for gas method of enhanced oil recovery that optimally meets the requirements for balance between oil recovery and carbon footprint.The aim of the research is to justify the probability of gas method of enhanced oil recovery at basic developed oil fields of the formationsK1jk-III-VII, K1nch-I, K1nch-III-IV.Research area is Vankor oil-gas condensate field located in Krasnoyarsk Territory and included in Vankor Cluster.Method: calculation of minimum miscibility pressure using techniques from Russian and international practice.Results. Taking into account oil displacement with gas and key factors influencing the process and choice of gas (pressure and temperature condition, geologic and physical reservoir characteristics, physical and chemical composition of formation fluids), the calculation of minimum miscibility pressure was performed at which gas can be completely dissolved in formation oil as a result of multiple contact miscible process at formation temperature. The types of gas miscibility with formation fluid were justified for the chosen pay zone in Vankor oil-gas condensate field, as well as the maximum efficiency of carbon dioxide gas as a gas driver was substantiated to enhance oil recovery as compared to nitrogen and carbon dioxide gas at final stage of separation. However, due to contemp orary infrastructure, production, macroeconomic conditions of producing company operation the project is not profitable.