Prospects of modeling the development of lenticular reservoirs under various production and injection scenarios

UDK: 622.276.1/.4.001.57

DOI: 10.24887/0028-2448-2026-7-28-32

Key words: hard-to-recover reserves (HTRR) of oil, lens development, hydrodynamic model, oil production, oil recovery factor

Authors: V.A. Khabardin1,2 (TatNIPIneft, RF, Almetyevsk; Almetyevsk State Technological University «Petroleum Higher School», RF, Almetyevsk); I.F. Gizzatullina (TatNIPIneft, RF, Almetyevsk); A.V. Nasybullin (Almetyevsk State Technological University «Petroleum Higher School», RF, Almetyevsk)

Due to various factors, the share of hard-to-recover oil reserves (HTRR) tends to increase. Significant volumes of HTRR are concentrated in oil deposits with lithologically trapped (lenticular) reservoirs. Admittedly such reservoirs have a low degree of depletion, which provides grounds for more extensive study of the problem and investigation of ways to enhance the efficiency of lens development. Primary problems of lenticular reservoir development are following: low production rates when lenses are developed by single wells; limited waterflooding, effectiveness of which depends on a number of factors (anisotropy of reservoir properties, lens size, well placement, etc.); geological heterogeneity (variation of lithological composition, permeability, and porosity). The greater the heterogeneity of reservoir properties of a lenticular body, the more areas unaffected by displacement processes may remain in it by the end of development. Within a heterogeneous formation, the thickness actually affected by waterflooding is often less than the total thickness of the waterflooded formation. A large share of HTRR may remain at the edges of a lens, low-productivity reservoirs, and stagnant and dead zones. Identifying these reserves and selecting their recovery methods is one of the key tasks of an effective development strategy for developing lenses. As digital technologies advance, it became possible to calculate numerous predictive scenarios for the development of targets using hydrodynamic models. This paper presents an example of predictive calculation for the development of a lenticular area in a hydrodynamic model under several scenarios to determine the factors affecting oil production and final oil recovery factor.

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