Abstract
Reservoir modeling requires a multitude of phase equilibrium calculations, particularly in the context of compositional reservoir simulations. To accelerate these calculations, the many components of the heptane plus fraction should be grouped into pseudocomponents. Moreover, accurate fluid compositions demand extensive laboratory analysis, a process both costly and time-consuming. The exercise of grouping and splitting are important for reservoir modeling. In our research, we introduce a lumping methodology for fluid characterization, focusing on the unique context of Kazakhstani oil. More specifically, we delve into the Whitson lumping and splitting techniques. For this study, a sample was taken from the X field, and detailed fluid composition data was acquired through laboratory analysis. We employed both numerical and analytical approaches to study the lumping process. Additionally, we compared our calculations with simulation results. As we navigate the intricacies of fluid characterization, we highlighted the advantages and limitations of lumping procedures and emphasized the effectiveness of Whitson method. Detailed fluid compositions obtained through laboratory PVT analysis were then compared with the results of simulation using PVTsim software and numerical delumping procedures The results of this work demonstrated the effectiveness of Whitson methods for lumping and splitting procedures for describing Kazakhstani fluids.