Abstract
Understanding the physical properties of gas reservoirs is important for field development and operational planning. Common compositions making up the fluids stream such as methane and heptanes-plus have a direct relationship with reservoir type and performance. The concentration of light and heavy components has essential relationships with saturation pressure and condensate-gas-ratio. An Equation of State (EOS) is expected to have the least error in these two properties to be considered predictive. The aim of this paper is to enhance the analysis process for fluid characterization by appraising the PVT properties, and assessing the predictability of a single EOS for a wet-gas system.
With the development of sophisticated simulation models, consistency of fluid properties have become an essential indicator for quality and accuracy. In this paper, a workflow is presented to evaluate a single EOS with data validation to examine anomalies, validating experimental values against calculated properties, and predicting properties of new samples. Fundamental relationships guided the workflow to extend the data examination spectrum, which contributed to the arrival at the best reservoir fluid characterization. The added value of the approach was significant; the results have shown consistency and applicability to various types of reservoirs to reach optimum fluid characteristics conclusions.
