April 2007

Gas Processing Developments

Improved equations for the Standing-Katz tables

Using these calculations can predict natural gas density and improve flowrates

Hall, K. R., Texas A&M University; Iglesias-Silva, G. A., Instituto Tecnologico de Celaya

Z-factors for natural gas (NG) mixtures come from equations of state, tables or charts and are critical in predicting NG flowrates in pipelines. The first approach requires an accurate formulation for the pure components that constitute the mixture, compositions of at least N-1 components and accurate mixing rules. Even though this approach is the ultimate goal, for simplicity, charts for natural gas z-factors have appeared in the past. Standing and Katz1 published a chart for the z-factor that is reliable for reservoir gas and gas condensate mixtures. Correlations for the Standing-Katz tables are interpolation procedures that use either the z-factor values or a polynomial representation of

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