Scholarly record

DEVELOPMENT OF METHODOLOGY FOR OPTIMAL CYCLIC INJECTION TECHNIQUES BASED ON MATHEMATICAL MODELING

Kamil M. Idrisov, Maria Shipaeva, Rustam Ziniukov, Vladislav Sudakov

Abstract

The study aims to identify the optimal operating conditions of wells to increase oil recovery without incurring additional costs for Enhanced Oil Recovery (EOR). The study analyzes various scenarios based on different properties of geological formations and wells. This work was carried out using three-dimensional hydrodynamic modeling. These models represent a simplified hydrodynamic model of a real object, which was created for the purpose of analyzing the processes being studied, but does not claim to be a complete description of the geological structure. At the same time, when constructing synthetic hydrodynamic models, the geological and physical properties of the modeled formation were taken into account. One of the most critical field and technological parameters determining the effectiveness of cyclic flooding technologies is the duration of the half-cycle. Calculations show a strong increase in accumulated oil in calculations during cyclic flooding with a half-cycle length of 3 days. However, this result strongly depends on the formation's piezoelectric conductivity and the distance between the injection and production wells. The following two experiments were carried out to identify the influence of the direction of the well pattern on the relative increase in oil production. At the first stage, the grid was modified to position the wells at the center of the model's boundary area. At the second stage, the wells are located so that they are at a certain distance from the boundaries of the model. This experiment indicates that the orientation of the well pattern significantly affects the outcomes of cyclic waterflooding. The results remained consistent with a diagonal well arrangement irrespective of the model size. To select models with different rock parameters in order to determine the possibility of working in further projects, an experiment was conducted to determine the effectiveness of cyclic flooding in hydrophobic rock. The simulation results indicate that cyclic flooding is ineffective in hydrophobic reservoirs. This is explained by the inability of the rock to retain water in its pores, as a result of which the oil remains practically motionless.

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Dimensions ID: pub.1183084669

DOI resolver: doi.org/10.5593/sgem2024/1.1/s06.72

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