Analysis of the flooding efficiency of low-permeability formations of the Achimov deposits

UDK: 622.276.43

DOI: 10.24887/0028-2448-2025-6-66-70

Key words: Achimov formation, flooding, cyclic flooding, facial model, mechanisms of oil displacement, compensation, Western Siberia

Authors: S.F. Bersenev (Ufa Scientific and Technical Center LLC, RF, Ufa); G.N. Badamshina (Ufa Scientific and Technical Center LLC, RF, Ufa); I.Z. Mullagalin (Ufa SciTechCenter LLC, RF, Ufa); E.A. Poretskov (Langepasneftegaz, RF, Langepas)

Due to the depletion of hydrocarbon reserves in traditional formations with good reservoir properties, interest in hard-to-recover reserves is currently increasing. And the main difficulty in the development of such reservoirs is the efficiency of waterflooding systems. The transition to the development of fields with a complex geological structure, low filtration characteristics of the formation, the existence of geological bodies with different properties, requires not only thoroughness in the formation of a conceptual understanding of the oilfield, but also the creation of detailed digital facial maps taking into account the existence of zones with different sedimentation, as a consequence, creating zones with different filtration-capacitance properties, requiring different approaches to development. The purpose of this work is to analyze the efficiency of the reservoir pressure maintenance system in low-permeability reservoirs of the Achimov formation and optimize its operation taking into account the facies model. An analysis of the current state of the facility's energetic was conducted, based on the results of which the field was divided into sections with different well operation patterns, related to sedimentation features. For each section, an analysis of well operation was conducted, inefficient injection zones were localized, the causes of inefficiency were determined, and proposals for pilot projects aimed at increasing the efficiency of flooding of the Achimov facility were prepared and implemented.

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