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For oil and gas fields with complex fluid behavior, the PVT properties of the fluid continuously change spatially in the reservoir (both in spacial and depth). While using common method to determine the composition variation and to build the fluid model more accurately under reservoir conditions, it is necessary to divide into sub-regions, and   to collect and analyze numerous fluid samples. This paper presents the application Equation of state in thermodynamic equilibrium has provided an effective method for modeling the fluid properties of such oil and gas reservoir. In this way, it is possible to model the fluid properties for each specific location in the space (continuous change) to minimize the need to carry out the sampling and analysis of additional fluid samples.

Combination of the State Equation with thermodynamic equilibrium to improve characterization of variated oil properties