The efficiency of water flooding systems in oil reservoirs using advanced stimulation technologies largely depends on the quality of site selection. Each site requires an individual approach based primarily on methodologies that define areas of effective technology application, which in turn are determined by the geological and physical characteristics of the productive formations, optimal technological parameters of well operations, technical capabilities, and economic feasibility. To address this challenge, the development of new reagents that can significantly increase the oil recovery factor (ORF) at already developed fields is highly relevant. This paper presents detailed results of laboratory research on the selection of polymers. Preparation of selected polymers for laboratory experiments was conducted using both synthetic water models and formation water samples collected from the field. Special attention was paid to the chemical composition of the formation water, as water viscosity is highly dependent on mineralisation. To study the criteria for polymer flooding and assess its effectiveness, Field “X” (a conditionally designated name) was selected. Additionally, the main properties of polymer compositions for the conditions of Fields “X” and “Y” were studied. Based on laboratory studies, a technology was developed and pilot-industrial tests were conducted in real wells of Fields “X” and “Y.” Among the polymers studied, Flopaam 5115VHM was found to be the most suitable for Field “X” in terms of solubility and viscosity, while FP5205 VHM and FC 6725 were identified as optimal for Field “Y.”

Keywords: oil field, polymer, viscosity, permeability, reservoir pressure maintenance, displacement coefficient

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