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Title: High Accuracy Measurements Of Natural Gas-Like Densities Using A Single-Sinker Magnetic Suspension Densitometer And A Validity Check Of AGA8-92DC
Author: Mert Atilhan, Saquib Ejaz, Prashant Patil, Kenneth R. Hall
Source: 2006 International Symposium on Fluid Flow Measurement
Year Published: 2006
Abstract: Accurate knowledge of the PVT behavior of natural gas at reservoir and pipeline conditions is necessary for several practical applications. The most important economic concerns relate to the custody transfer of natural gas. Furthermore, high-accuracy density and phase change data can validate equations of state (EOS). Development of AGA8-DC92, currently the industry standard for natural gas custody transfer, used a round robin project (RR) and a databank covering gas mixtures with compositions containing up to 0.2 mole percent of the C6+ fraction. Hopefully, AGA8-DC92 could predict densities of natural gas mixtures containing higher mole percentages of C6+ with the same accuracy. A need exists for high-accuracy density data to check the validity of AGA8-DC92 over the entire range of pressure, temperature and composition encountered in custody transfer. It is also important to compare the RR and earlier databank for AGA8-DC92 EOS to the latest natural gas data measurements. For these reasons, we have used data on two different natural gas samples, RR-NIST2 and M91C1, to discover the differences that heavy components make on both predicted and measured phase envelopes. We have used a state-of-the-art, high pressure, high temperature, compact single-sinker magnetic suspension densitometer to collect densities of a simulated natural gas mixture over the range (270 to 340) K (26.33 to152.33) oF, (-3.15 to 66.85) oC and (3.447 to 34.474) MPa (500 to 5,000) psia. These data can serve as a test for the validity of AGA8-DC92 or any other EOS.

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