Neftyanaya Provintsiya
electronic peer-reviewed scholarly publication
Neftyanaya provintsiya No. 2(42), 2025

Changes of physical and chemical oil properties during development of an oil reservoir in the Volga-Ural province

A.A. Gibadullin, M.P. Sakharova, A.A. Fayzullina, L.T. Mingazova, I.G. Fattakhov
DOI: https://doi.org/10.25689/NP.2025.2.64-75

Abstract


The paper describes one of oil reservoirs in the Volga-Ural province. Development of this area started in 1951. The primary production targets are productive Kynovian (D0) and Pashian (D1) sediments of the Lower Frasnian substage of the Upper Devonian. Maximum oil production of as high as 3.3 million tons was reached in 1961. Implementation of waterflooding and enhanced oil recovery (EOR) methods allowed for maintaining of the production rate at 2.5 million tons per year.
The paper highlights the results of comparative analysis of changes in the main parameters of oil and gas of the Kynovian-Pashian sediments at different stages of development (initial - 1950-1970, intermediate - 1970-1990, late - 1990 - till present). It has been seen that such parameters as bubble point pressure, gas-oil ratio, and formation volume factor decrease, while density, viscosity, and compressibility factor of reservoir oil increase. Increase in the content of paraffins, resins and asphaltenes has been observed. Such changes are indicative of the final field development stage. Maintaining oil production requires selection of the most efficient EOR methods taking into account the changes in physical and chemical oil properties.

Key words:

field, oil, physical and chemical properties, compositional analysis, density, viscosity, enhanced oil recovery

References

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Authors

A.A. Gibadullin, Head of Sector, Formation Evaluation and Well Test Department, TatNIPIneft Institute of PJSC Tatneft
216, Sovetskaya Str., Almetyevsk, 423462, Russian Federation
E-mail: oillab@tatnipi.ru

M.P. Sakharova, 2nd Category Engineer, Formation Evaluation and Well Test Department, TatNIPIneft Institute of PJSC Tatneft
216, Sovetskaya Str., Almetyevsk, 423462, Russian Federation
E-mail: SakharovaMariyaP@tatnipi.ru

A.A. Fayzullina, 2nd Category Engineer, Formation Evaluation and Well Test Department, TatNIPIneft Institute of PJSC Tatneft
216, Sovetskaya Str., Almetyevsk, 423462, Russian Federation
E-mail: FayzullinaAnzhelaA@tatnipi.ru

L.T. Mingazova, 2nd Category Engineer, Formation Evaluation and Well Test Department, TatNIPIneft Institute of PJSC Tatneft
216, Sovetskaya Str., Almetyevsk, 423462, Russian Federation
E-mail: MingazovaLeysanT@tatnipi.ru

I.G. Fattakhov, Dr.Sc (Engineering), Professor, Oil and Gas Field Exploration and Development, director, Research in well stimulation and synthesis of oilfield chemicals of TatNIPIneft Institute of PJSC Tatneft
186а, Sovetskaya Str., Almetyevsk, 423458, Russian Federation
E-mail: i-fattakhov@rambler.ru

For citation:

A.A. Gibadullin, M.P. Sakharova, A.A. Fayzullina, L.T. Mingazova, I.G. Fattakhov Izmeneniye fiziko-khimicheskikh svoystv nefti v protsesse razrabotki neftyanogo ob"yekta Volgo-Ural'skoy provintsii [Changes of physical and chemical oil properties during development of an oil reservoir in the Volga-Ural province]. Neftyanaya Provintsiya, No. 2(42), 2025. pp. 64-75. DOI https://doi.org/10.25689/NP.2025.2.64-75. EDN TZMWMZ (in Russian)

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