Development of an Equation of State for Computation of Supercompressibility Factors, Critical Flow Factors, and Other Properties for Wet, Sour Natural Gases, Synthetic Gases and Admixtures. Final Report October 1984-September 1987

摘要

The research effort has extended the highly accurate compressibility/supercompressibility factor correlation for sweet/dry natural gases developed in 1981-1984 to include water and hydrogen sulfide. In the temperature and pressure range where most custody transfers take place, the correlation is accurate within 0.1% or better in the supercompressibility factor. One of the conclusions reached in the work is that a more extensive high quality PVT data base for wet/sour natural gases is needed to further test the correlation. The revised alternate characterization methods developed in the work allow faster and simpler calculations resulting in large reductions in computer time when compared with the alternate characterization methods presented in A.G.A. Report No. 8. The prediction accuracies for these methods are comparable or slightly better than the A.G.A. Report No. 8 alternate characterization methods. As compared to the A.G.A. Report NX-19 alternate characterization methods, the methods developed in the work require similar computer time, while giving dramatically more accurate results. The equation-of-state method has been applied for prediction of highly accurate sonic velocities and critical flow factors for use with sonic nozzles. The prediction of the sonic velocity is shown to be generally accurate within plus or minus 0.1% at reasonable operation conditions for sonic nozzles. The prediction of critical flow factors is also shown to be more accurate than the Johnson method.