Application of Multivariate Geological and Hydrodynamic Modeling to Substantiate Development Systems for TULA Productive Formations

Author details
  • Perm National Research Polytechnic University, Perm, Russian Federation
  • China University of Petroleum, Qingdao, People's Republic of China
  • Perm National Research Polytechnic University, Perm, Russian Federation
  • Perm National Research Polytechnic University, Perm, Russian Federation

Abstract

The subject of this study is the process of substantiating an effective development system for the combined exploitation of the Tula oil deposits (Tl2-a, Tl2-b). The Tl2 productive formation is characterized by high facies variability, which results in heterogeneity of reservoir properties and poor consistency of effective oil-saturated intervals, leading to uneven reserves recovery during well operation. Using geological and hydrodynamic modeling, a comparative analysis of the performance indicators of various development systems was performed. Their effectiveness was assessed using a 3D model of a typical Tula field. Cumulative production dynamics and the ultimate oil recovery factor served as the performance criteria for the design solutions. Scenario options were calculated and analyzed using the results of geological and hydrodynamic modeling. Various configurations were compared: areal (seven-spot) and in-line (single-row, three-row) systems with different well pattern density and injection well placement patterns. A separate analysis of the calculation results for each reservoir shows that the Tl2-b reservoir is characterized by higher displacement efficiencies due to its high permeability. The main challenge in its development is premature water flooding of highly permeable interlayers. The Tl2-a reservoir, with lower permeability, is characterized by lower oil displacement. 3D modeling calculations revealed that single-row development systems were the least efficient. High injection rates combined with a linear well spacing result in preferential flow paths for injected water, leading to premature water cuts in production wells. High technological efficiency is achieved using a three-row development system with a well spacing of 300×300 m, which ensures the highest oil recovery and uniform reservoir coverage. Seven-spot development systems with a more sparse well pattern can also be considered as a reasonable alternative, as they ensure uniform oil displacement and the involvement of zones of reduced permeability in the Tl2-a formation.

Keywords

development systemhydrodynamic modelpermeabilityoil recovery factor

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Article information

Published
14 May 2026
Issue date
14 May 2026
Issue
Vol. 26, No. 2 (2026)
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