Abstract
The object of research is water-driven gas-condensate reservoirs. Using the main hydrodynamic modeling tools Eclipse and Petrel from Schlumberger (USA), the study was carried out to improve the existing technologies for the displacement of residual gas reserves by carbon dioxide from the water-driven gas-condensate reservoirs. The carbon dioxide injection technology was tested in the V-16 reservoir of the Hadiach oil and gas condensate field (Ukraine). According to the study results, it was found that due to the injection of non-hydrocarbon gas, the cumulative water production are reduced compared to the depletion. Based on the obtained modeling results, the calculation of the predicted hydrocarbon recovery factors at the moment of carbon dioxide breakthrough into the production well was carried out according to the cumulative formation water production. According to the calculations, it was found that the implementation of the enhanced gas recovery technology provides significantly higher ultimate hydrocarbon recovery compared to the depletion. The predicted gas recovery factor when injecting carbon dioxide into the V-16 reservoir increases by 2.95 % of the residual gas reserves, and the condensate recovery factor for these conditions by 1.24 %. Based on the study results, the technological efficiency of using carbon dioxide as an injection agent to increase the hydrocarbon recovery from water-driven reservoirs was established. According to the simulation results, the implementation of the technology of carbon dioxide injection into the V-16 reservoir of the Hadiach oil and gas condensate field can significantly increase the hydrocarbon recovery from the deposit, thereby increasing the production capacity of the field.
Highlights
The overwhelming majority of productive deposits of gas and gas condensate fields are depleted and are mainly influenced by water-pressure systems and are developed in conditions of the movement of formation water into gas-saturated horizons [1, 2].The main difficulties that arise during the production of residual hydrocarbon reserves are associated with the peculiarities of the development of deposits at the final stage, which is characterized by low values of reservoir pressure, low production rate and water cut of producing wells [3].Development of deposits under water-drive conditions is characterized by an uneven movement of the gas-water contact, depending on the nature of the distribution of reservoir properties, both in area and in thickness
The technology of injecting carbon dioxide into the reservoir of the V-16 horizon of the Hadiach oil and gas condensate field (Ukraine) was tested in order to displace the residual gas trapped by formation water
According to the results of history matching of the simulation model of the reservoir of the V-16 horizon, it was established that part of the residual gas reserves is restrained by formation water
Summary
The overwhelming majority of productive deposits of gas and gas condensate fields are depleted and are mainly influenced by water-pressure systems and are developed in conditions of the movement of formation water into gas-saturated horizons [1, 2]. The main difficulties that arise during the production of residual hydrocarbon reserves are associated with the peculiarities of the development of deposits at the final stage, which is characterized by low values of reservoir pressure, low production rate and water cut of producing wells [3]. According to the studies [8, 9], it has been established that it is the heterogeneity of productive deposits that introduces significant uncertainty in the process of justifying the recommended technology for further development of hydrocarbon deposits in an active water-drive mode. The technology of injecting carbon dioxide into the reservoir of the V-16 horizon of the Hadiach oil and gas condensate field (Ukraine) was tested in order to displace the residual gas trapped by formation water
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