Ajuste fino de correlaciones PVT para algunos crudos colombianos

• Main Authors: DUBAN FABIAN GARCIA NAVAS, Jorge Andrés Prada Mejía, Juan Pablo Osorio Suárez
• Format: Article
• Language: Spanish
• Published: Universidad Industrial de Santander 2017-12-01
• Series: Revista Fuentes El Reventón Energético
• Subjects: Correlation Optimization; Viscosity; Density; Volumetric Factor
• Online Access: https://doi.org/10.18273/revfue.v15n2-2017005
• ISSN: 1657-6527; 2145-8502

The accurate estimation of reservoir fluid properties as a function of temperature and pressure depicts a key step in the procedure of developing a correct well flow model. The strictest model currently applied uses the Equations of State (EOS), by a detailed description of the fluid composition and assigning certain properties for each component. One generalized approach so called Black-Oil model considers the reservoir fluid as mixture of three phases: water, oil and gas, which generally regards only the dissolution of gas in water and oil, but the liquids are immiscible. Both approaches use adjusting of experimental PVT tests to mathematical expressions. Generally, model developing effort is related to the purpose of the fluid model and production mechanism, nevertheless in bottom and surface well level cases (not for reservoir level), the estimation is simplified using empirical correlations based on Black-Oil model which have been widely used and several authors develop them. These correlations lack in extrapolated conditions. In this work, the results of fine tuning methodology through different correlations optimization to PVT properties of four Colombian crude oils (Castilla and Chichimene as heavy and extra-heavy oils, and other more lighter crudes such as Apiay and Yariguí), whose API gravities are between 7 to 30°. Experimental PVT data test and other conditions such as well surface data and expected performance are used to obtain expressions which achieve good representation of fluid properties in typical well operational conditions. These expressions are useful for other fluids with comparable properties than the fluid used for adjusting, for instance well fluids of the same field.