Utilization of associated petroleum gas in conditions of carbonate cavernous-fractured reservoirs of oil and gas fields in Eastern Siberia

This article analyzes the utilization of associated petroleum gas at oil fields in Eastern Siberia, which are characterized by complex carbonate cavernous-fractured reservoirs. The importance of this study arises from the fact that many oil fields operate under technological schemes that do not adequately reflect the geological structure of heterogeneous productive reservoirs. As a result, oil reserves are depleted prematurely and water cut increases rapidly. Additionally, the rational utilization of associated gas often receives insufficient attention, particularly in scenarios where there is a lack of gas transportation or processing infrastructure, low matrix permeability, and natural fracturing. The study aims to develop scientifically grounded recommendations for the efficient utilization of APG at Eastern Siberian fields that operate under depletion drive without waterflooding systems due to the complex structure of the void space and the filtration-capacitance properties of carbonate reservoirs of oil and gas deposits. The study shows that current APG utilization methods exhibit limited efficiency in carbonate reservoirs. By examining the geological and physical properties of these reservoirs, the authors were able to justify potential technological solutions. To optimize the APG utilization system, the work evaluated gas reinjection as a means of pressure maintenance agent, taking into account the characteristics of the pore space. This approach can help APG flaring and improve both economic and environmental performance of field development. In conclusion, the article offers recommendations for the placement of injector well placement based on reservoir characteristics, illustrated by an example of Field X. 

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