Development of Black Oil Correlations for approximation of PVT properties for Integrated Production Modeling for Heera Oil Field.

Abstract

Integrated Production Modeling approach mainly aims at integrating the Inflow performance and Outflow Performance of oil wells along with the analysis of the multiphase flow through wellhead up to the processing plant. Results of Reservoir and Production simulation studies heavily rely upon the accuracy of the PVT data as input. It is observed that sufficient high-quality experimental data from PVT Lab are not always available for fluids characterization. It makes the use of PVT modeling with Equation of state (EOS), Simulation techniques, and other statistical and empirical regression approaches viz. Black Oil Correlations to provide approximations of these PVT physical properties. Black Oil Correlations developed by previous researchers were based on crudes of different geologic locations with different crude compositions, paraffinicity and chemical properties and have their own range of applicability. Hence, for the reservoir fluids of a new study area, to achieve better approximation of PVT properties new regional correlations are required. In this work, a study has been made for determination of the four most important PVT properties based on limited available lab determined PVT data sets, by developing four regional black oil PVT correlations for (i) Bubble Point Pressure (ii) Oil Formation Volume Factor (iii) Solution Gas Oil Ratio and (iv) Dead Oil Viscosity, for a part of Heera Oil Field of Western Indian Offshore. These correlations were developed by taking reference of a few existing correlations and determined the new coefficients by Non-linear regression analysis. Comparative error analysis shows that these correlations are capable of better approximations of these physical properties with least Average Percentage Relative Error and Average Absolute Percentage Relative Error. Hence found as best suitable for the reservoir fluids of Heera Field. These correlations may be useful for calculation of important PVT data required for Integrated Production Modeling and optimization of Heera Field wells and for any oil field with similar geologic location and with reservoir fluids having similar ranges of physical properties.