«Oilfield engineering»

Analysis of the applicability of foreign authors’ correlation dependencies for calculating the physical-chemical properties of oil based on laboratory data from deep samples of the Timan-Pechora and West Siberian petroleum provinces

UDC: 622.276.031.011.43:51
DOI: -

Authors:

¹ National University of Oil and Gas "Gubkin University", Moscow, Russia

Keywords: Black Oil model, correlation dependencies, physical-chemical properties of oil, bubble point pressure, gas-oil ratio, formation volume factor, oil viscosity, empirical equations

Annotation:

The authors of the article analyze the applicability of correlation dependencies, developed by foreign authors for calculating the physical-chemical properties of oil based on laboratory data from deep samples of the Timan-Pechora and West Siberian oil and gas provinces. The main empirical correlations for calculating the saturation pressure, gas content, volumetric coefficient and viscosity of oil used in the simplified thermodynamic model of Black Oil fluids are considered. The calculation values and the actual data are compared, the considered dependencies limits are identified and their accuracy is estimated. The results of the study show that foreign correlation dependencies developed on the basis of data from other oil-producing regions of the world (the Gulf of Mexico, the North Sea, the Middle East, the USA) do not always correctly describe the properties of oil from Russian fields. It was also stated that the use of correlation applicability ranges can significantly reduce the error of predictive calculations. It was revealed that none of the standard foreign methods provide sufficient accuracy for Russian deposits, which emphasizes the necessity of developing regional correlation dependencies.

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