Neftyanaya Provintsiya Journal

No.1(21),2020

RESERVOIR SIMULATION MODELS USED TO STUDY FLUID FILTRATION PROCESSES IN HEAVY AND EXTRA-HEAVY OIL FIELDS DEVELOPED BY AIR INJECTION

R.Kh. Nizaev, G.V. Aleksandrov, Yu.L. Yegorova

DOI: https://doi.org/10.25689/NP.2020.1.109-124

PP.109-124

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Abstract

The paper summarizes results of model studies of in-situ processes in heavy and extra-heavy oil reservoirs with differing geological and PVT characteristics developed by air injection. In terms of the mode of oil occurrence, two types of reservoirs with the original oil saturation values 0.4, 0.6, and 0.8 were considered, namely, reservoirs similar to those associated with the Sheshminskian formation dated to the Ufimian age, and reservoirs similar to those confined to the Bashkirian, the Visean, and the Tournaisian formations. For the former, the original oil viscosities from 1000 to 50,000 mPa·s were used in calculations, while for the latter, the original oil viscosity values ranged from 300 to 900 mPa·s. It was found that for the first type of reservoirs, with the original oil saturation 0.8 and zero free water at initial reservoir conditions, the time period between the start of air injection and the start of the formation temperature intensive growth is defined by the original oil viscosity. Based on the obtained oil recoveries, polynomial and power-law dependencies of oil recovery factor vs. initial reservoir conditions–depth of reservoir, in-situ viscosity, and original oil saturation–were built.

Key words:

heavy oil accumulation, extra-heavy oil accumulation, reservoir flow model, air injection, oil viscosity, average formation temperature, oil recovery factor

References

 

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  2. Nizaev, R.Kh., G.V. Aleksandrov Sovershenstvovanie tekhnologii razrabotki zalezhej vysokovyazkoj i sverhvyazkoj nefti iniciirovaniem vnutriplastovogo goreniya po rezul'tatam raschyotov na cifrovyh fil'tracionnyh modelyah [Improvement of heavy and extra-heavy oil production technology by in-situ combustion processes based on reservoir modeling results]. Territoriya Neftegaz, No. 4, 2017. pp. 84-90 (in Russian)

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  4. Nizaev R.Kh., Bakirov I.M., Aleksandrov G.V., Yamgutdinov M.R. Issledovanie effektivnosti razrabotki zalezhej sverhvyazkoj nefti s razlichnymi geologo-fizicheskimi harakteristikami s pomoshch'yu vnutriplastovogo goreniya na osnove modelirovaniya [Development of oil reservoirs with differing characteristics using in-situ combustion recovery process initiated by air injection based on reservoir modeling results]. Neftyanaya provintsiya e-journal, No. 2, 2015. pp. 102-115. Available at: http://www.vkro-raen.com/#!blog/cp6k (in Russian)

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  7. Nizaev R.Kh., Aleksandrov G.V. Postroenie analiticheskih zavisimostej koefficienta nefteizvlecheniya zalezhej vysokovyazkoj nefti s razlichnymi geologo¬ fizicheskimi harakteristikami pri ih razrabotke s pomoshch'yu vnutriplastovogo goreniya s ispol'zovaniem termogidrodinamicheskogo modelirovaniya [Reservoir modeling used to build analytic dependencies for values of oil recovery factors for oil reservoirs with differing characteristics developed by in-situ combustion]. Proc. of International research to practice conference “Achievements, problems, and prospects of oil-and-gas industry development”. Almetyevsk, 25-28 Oct 2017, Almetyevsk State Oil Institute Publ., 2018. pp. 91‑96. (in Russian)

Authors

R.Kh. Nizaev, Dr.Sc., Assistant Professor, Leading Research Associate, TatNIPIneft–PJSC TATNEFT, Bugulma, Republic of Tatarstan, Russian Federation

E-mail: nizaev@tatnipi.ru

 

G.V. Aleksandrov, Junior Research Engineer, TatNIPIneft–PJSC TATNEFT, Bugulma, Republic of Tatarstan, Russian Federation

E-mail: razrcmg@tatnipi.ru

 

Yu.L. Egorova, Senior Lecturer of Almetyevsk State Oil Institute, Almetyevsk, Republic of Tatarstan, Russian Federation

E-mail: ulaegor@rambler.ru

For citation:

R.Kh. Nizaev, G.V. Aleksandrov, Yu.L. Yegorova Issledovanie haraktera protekaniya processov fil'tracii v zalezhah vysokovyazkoj i sverhvyazkoj nefti pri zakachke vozduha s pomoshch'yu gidrodinamicheskogo modelirovaniya [Reservoir simulation models used to study fluid filtration processes in heavy and extra-heavy oil fields developed by air injection]. Neftyanaya Provintsiya, No. 1(21), 2020. pp. 109-124. DOI https://doi.org/10.25689/NP.2020.1.109-124 (in Russian)