Abstract
High-accuracy density measurement data are necessary to develop and validate equations of state (EoS) for use in custody transfer of natural gas through pipelines. The development of AGA8-DC92, which is the current industry standard EoS, used a databank of natural gas mixtures with compositions containing up to 0.2 mole fraction of the heavier C6+ fraction and should predict densities of natural gas mixtures containing higher mole fractions of the C6+ fraction with the same accuracy. With advances in exploration, drilling, and production, natural gas streams containing higher percentages of the C6+ fraction have become available from the deep-water and ultradeep-water Gulf of Mexico in recent years. High-accuracy density data for such natural gas mixtures are necessary to check if AGA8-DC92 covers the entire range of pressure, temperature, and composition encountered in custody transfer. An isochoric apparatus allows the performance of precise and fast measurements through a fully automated procedure over...
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