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Natural gases containing sour components exhibit different gas compressibility factor(Z) behavior than do sweet gases.Therefore,a new accurate method should be developed to account for these differences.Several methods are available today for calculating the Z-factor from an cquation of state. However,these equations are more complex than the foregoing correlations,involving a large number of parameters,which require more complicated and longer computations.The aim of this study is to develop a simplified calculation method for a rapid estimating Z-factor for sour natural gases containing as much as 90% total acid gas.In this article,two new correlations are first presented for calculating the pseudo- critical pressure and temperature of the gas mixture as a function of the gas specific gravity.Then,a simple correlation on the basis of the standard gas compressibility factor chart is introduced for a quick estimation of sweet gases’ compressibility factor as a function of reduced pressure and temperature.Finally,a new corrective term related to the mole fractions of carbon dioxide and hydrogen sulfide is developed.
Natural gas containing sour components exhibit different gas compressibility factor (Z) behavior than do sweet gases. Before, a new accurate method should be developed to account for these differences. Sevral methods are available today for calculating the Z-factor from an cquation of state However, these equations are more complex than the previous correlations, involving a large number of parameters, which require more complicated and longer computations. The aim of this study is to develop a simplified estimation method for a rapid estimate Z-factor for sour natural gas containing as much as 90% total acid gas.In this article, two new correlations are first presented for calculating the pseudo- critical pressure and temperature of the gas mixture as a function of the gas specific gravity. Chen, a simple correlation on the basis of the standard gas compressibility factor chart is introduced for a quick estimation of sweet gases’ compressibility factor as a function of reduced press ure and temperature. Finally, a new corrective term related to the mole fractions of carbon dioxide and hydrogen sulfide is developed.