No.1(41),2025 PP.136-150

Neftyanaya provintsiya No. 1(41), 2025

Field-Geological reasoning to increase and regulate the production of residual oil reserves

A.A. Makhmutov, R.U. Rabaev, A.M. Malyarenko, М.А. Fokin
DOI: https://doi.org/10.25689/NP.2025.1.136-150

Abstract

This article presents the results of a detailed geological and economic analysis of measures to increase and optimize the extraction of residual oil reserves, using one of the oil and gas fields in the Volga-Ural region as an example. The study shows that the field under investigation is undergoing long-term development, and its reservoir pressure maintenance system is becoming less efficient. One of the ways to improve the current development strategy and maximize the extraction of remaining reserves without significant capital investment is through the use of non-steady (cyclic) waterflooding technology. The article discusses a number of geological and technical factors that need to be considered when selecting a promising site for implementing this technology. For this purpose, maps have been constructed that show the layer-by-layer heterogeneity of the formations in terms of their filtration and reservoir properties. These maps also include information about the current reservoir pressure, the residual recoverable and mobile oil reserves, as well as the undrained reserves that can be accessed by the current development system. Analysis of these maps has allowed us to select a reservoir site that has a significant density of undrained reserves and a high degree of layer-by-layer heterogeneity. Additionally, the energy condition of the reservoir is satisfactory. In order to assess the impact of injection wells on the producing wells within the selected reservoir, we have calculated well interaction coefficients. These coefficients indicate that the area we have chosen is characterized by the lowest level of interaction, which means that it requires adjustments to the flooding system. Various options for non-stationary flooding have been considered in order to optimize the process and maximize oil production from the selected area. It is proposed to develop the considered section of the reservoir during non-stationary flooding using a scheme of alternating injection well switching, which consists of various geometric shapes. One cycle lasts 28 calendar days, while a half-cycle, separated by operating modes, lasts 14 days. An assessment of the technological efficiency of the recommended measures has been conducted. It has been noted that regulating the operating modes of production wells will allow for additional oil production and the involvement of undeveloped reserves by redistributing filtration flows across the area and thickness of the reservoir.

Key words:

unsteady flooding, reservoir pressure, residual oil reserves, injection well, reservoir, injection, technological parameters, efficiency

References

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Authors

A.A. Makhmutov, doctor of geological and mineralogical sciences, professor, Geophysical research methods department, Ufa State Petroleum Technological University, Associate member of Academy of sciences of the Republic of Bashkortostan
1, Kosmonavtov Str., Ufa, 450064, Russian Federation
E-mail: makhmutov_aa@mail.ru

R.U. Rabaev, PhD in Engineering, Associate Professor, Geology department, Ufa State Petroleum Technological University
1, Kosmonavtov Str., Ufa, 450064, Russian Federation
E-mail: rabaev.r@mail.ru

A.M. Malyarenko, PhD in Geology and Mineralogy, Associate Professor, Exploration and development of oil and gas fields department, Ufa State Petroleum Technological University
1, Kosmonavtov Str., Ufa, 450064, Russian Federation
E-mail: m_alina_m@mail.ru

М.А. Fokin, director, LLC «Teics»
7, Nobel Str., Skolkovo Innovation Center, Moscow, 143026, Russian Federation
E-mail: mfokin2011@yandex.ru

For citation:

A.A. Makhmutov, R.U. Rabaev, A.M. Malyarenko, М.А. Fokin Geologo-promyslovoye obosnovaniye meropriyatiy po povysheniyu i regulirovaniyu vyrabotki ostatoch-nykh zapasov nefti [Field-Geological reasoning to increase and regulate the production of residual oil reserves]. Neftyanaya Provintsiya, No. 1(41), 2025. pp. 136-150. DOI https://doi.org/10.25689/NP.2025.1.136-150. EDN MTSWWA (in Russian)

© Non-governmental organization Volga-Kama Regional Division of the Russian Academy of Natural Science, 2015-2025 All the materials of the journal are available under the Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/)

Field-Geological reasoning to increase and regulate the production of residual oil reserves A.A. Makhmutov, R.U. Rabaev, A.M. Malyarenko, М.А. Fokin DOI: https://doi.org/10.25689/NP.2025.1.136-150

Key words: unsteady flooding, reservoir pressure, residual oil reserves, injection well, reservoir, injection, technological parameters, efficiency

Field-Geological reasoning to increase and regulate the production of residual oil reserves

A.A. Makhmutov, R.U. Rabaev, A.M. Malyarenko, М.А. Fokin
DOI: https://doi.org/10.25689/NP.2025.1.136-150

Key words:

unsteady flooding, reservoir pressure, residual oil reserves, injection well, reservoir, injection, technological parameters, efficiency