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OIL RESERVOIR DEVELOPMENT MONITORING USING FLUORESCENT TRASERS
Abstract
The use of indicator methods in oil and gas field geology allows us to obtain representative quantitative information about the direction and velocity of fluid movement in the studied formations, to assess the main filtration parameters and the presence of inter-reservoir flows, as well as reliable information about the technical condition of wells. The use of indicators (tracers) is based on the injection of water (or an aqueous solution of the reagent) labeled with a stable or radioactive indicator and subsequent monitoring of its progress, which is carried out by periodically sampling fluid from the mouths of control production wells. Determination of the concentration of indicators in the aqueous phase is carried out in laboratory conditions. As indicators for the preparation of labeled liquids, such stable indicators as ammonium thiocyanate, potassium thiocyanate, uranine, fluorescein, eosin, carbamide or others can be used that have the appropriate properties required for research to control the movement of injected water in oil fields. These indicators do not violate the geochemical equilibrium of formation fluids and do not worsen the oil-displacing properties of the injected water and reagents. Based on the current data of the extracted mass of the indicator for each well, the current coefficient of the influence of the injection well on the observation production well is calculated. The paper presents a method for applying and processing the obtained information in well tracer studies using ultrafine phosphors. Experimental studies of the dependence of the concentration of tracers in the reservoir fluid were carried out on the spectrofluorimeter. The obtained spectral data is processed by special programs and transmitted to Excel for subsequent calculations of the hydrodynamic connection of production and injection wells.
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