The paper considers the known correlations and conditions of their applicability for calculating the PVT properties of reservoir oil, gas and water for fields located on the territory of the activities of RN-Purneftegas LLC. For correlations that meet the conditions of applicability for the deposits of RN-Purneftegaz LLC, the results of laboratory determination of PVT properties were compared with the results of calculation by correlations. Correlations have been determined for strata or groups of strata of each deposit, which give minimal mismatch with laboratory data when calculating PVT properties. A matrix of applicability of various correlations has been developed, in which correlations are given for each PVT property for deposits or groups of deposits of each deposit, allowing the most accurate determination of PVT properties. Correlations were found to determine the gas content, volume coefficient, compressibility, viscosity of oil at given values of pressure, temperature, saturation pressure, relative density of oil in water and relative density of gas in air. Correlations are selected to determine the z-factor and the viscosity of the gas for a given pressure, temperature and relative density of the gas through the air. Correlations are selected to determine the solubility of gas, density, compressibility and viscosity of water depending on pressure, temperature and mineralization. Based on the obtained results, an audit and correction of the album of PVT properties was carried out. Corrected PVT properties of reservoir fluids will be used in forming of technological regime of wells, in planning of dissolved gas production, well tests interpretation and in reservoir development projecting.
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