Neftyanaya Provintsiya
electronic peer-reviewed scholarly publication
Neftyanaya provintsiya No. 2(42), 2025
Effect of compartmentalization on the oil recovery of highly depleted terrigenous formations of Tatarstan
M.A. Sharifullina, I.G. Fattakhov, S.L. Voldavin
DOI: https://doi.org/10.25689/NP.2025.2.76-88
M.A. Sharifullina, I.G. Fattakhov, S.L. Voldavin
DOI: https://doi.org/10.25689/NP.2025.2.76-88
Abstract
In this paper the authors analyzed 40 field assets related to Tulskian-Bobrikovskian and Kynovian-Pashian sediments, the depletion degree of which is more than 70%, to study the effect of heterogeneity on the relationship between well spacing and oil recovery. Investigated fields were divided into two groups based on initial oil mobility.
Coefficients A and B of the relationship ORF = A * e(-B*WS*1,5)were determined for facilities groups in different ranges of compartmentalization and net sand. It was noted that the relationship between ORF and well spacing can be observed more clearly and with greater approximation accuracy when categorizing field facilities by compartmentalization.
Following the analysis of parameters of 24 field facilities from the second group, a linear relationship with compartmentalization of the form y = -0,0317x + 0,7868 was determined for coefficient , and for coefficient B – a logarithmic relationship of the form y = 0,9584ln (x) + 0,0871 (compartmentalization range is 1.4–6.5).
Relationship between ORF and well spacing was additionally analysed for two groups, with subdivision based on entropy associated with compartmentalization. Subgroups of field assets are nonoverlapping. Predominant relationship trends have sharper decline compared to assessment by compartmentalization. However, relationships acquired by subdivision based on compartmentalization have more reliable coefficients of determination.
It was concluded that heterogeneity of productive formation has a significant effect on the relationship between oil recovery and well spacing.
Key words:
well spacing, heterogeneity, compartmentalization, net sand, the effect of compartmentalization on the oil recovery
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Authors
M.A. Sharifullina, Head of Laboratory, Department of Informational Technology Development and Reservoir Simulation, TatNIPIneft Institute of PJSC Tatneft
186A, Sovetskaya Str., Almetyevsk, 423403, Russian Federation
E-mail: chernovama@tatnipi.ru
I.G. Fattakhov, Dr.Sc. (Eng.), Director for Enhanced Oil Recovery, Wave and Biological Technologies, TatNIPIneft Institute of PJSC Tatneft
186A, Sovetskaya Str., Almetyevsk, 423403, Russian Federation
E-mail: i-fattakhov@rambler.ru
S.L. Voldavin, Deputy Director for Planning and Methodological Support of Innovation Activities, Technological Development Center, PJSC Tatneft
88, Telman Str., Almetyevsk, 423462, Russian Federation
E-mail: VoldavinSL@tatneft.tatar
For citation:
M.A. Sharifullina, I.G. Fattakhov, S.L. Voldavin Vliyaniye raschlenennosti na nefteizvlecheniye vysokovyrabotannykh terrigennykh plastov Respubliki Tatarstan [Effect of compartmentalization on the oil recovery of highly depleted terrigenous formations of Tatarstan]. Neftyanaya Provintsiya, No. 2(42), 2025. pp. 76-88. DOI https://doi.org/10.25689/NP.2025.2.76-88. EDN SXDSZW (in Russian)
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