Modeling C7+ and Asphaltene Compositional Grading in Oil Reservoirs

Autor: Ana Ramírez-Gallardo, Isidoro Garcia-Cruz, C. Lira-Galeana
Rok vydání: 2023
DOI: 10.22541/au.167764503.37257271/v1
Popis: A previously proposed framework to model compositional grading in continuous or semicontinuous mixtures is here extended to model segregation profiles of reservoir-fluid columns containing heavy fractions and asphaltenes. The gravity-induced variation in plus-fraction molecular weights is described with a a two-moment formulation of gravitational equilibria, to predict composition, distribution functions and reservoir pressure gradients in multi-ensemble fluid columns displaying gas-cap, oil leg and tar-mat regions in the reservoir. By coupling a saturation pressure calculation to the segregated profiles, the oil-gas and oil-tar contacts in the reservoir are easily calculated. We first present a description of the method for computation of these gradients. Comparison of this method with measured data of two reservoir fluid columns shows the adequacy of the proposed approach.
Databáze: OpenAIRE