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Title: Considerations In Sampling Wet, High Pressure Or Supercritical Natural Gas
Author: James N. Witte
Source: 2011 International School of Hydrocarbon Measurement
Year Published: 2011
Abstract: This paper discusses the problems encountered during online sampling of wet, high pressure and supercritical natural gas for subsequent compositional analysis. It provides solutions and comments on how they relate to the API and GPA industry standards for natural gas sampling. The paper also discusses the use of phase diagrams in the design and operation of a natural gas sampling system. The phase diagrams presented in this paper were calculated using a commercial software program intended for that purpose. The Peng-Robinson Equation of state was utilized by the software to compute pressures and temperatures necessary to construct each phase diagram presented. The gas compositions considered in this document were either taken from AGA Report 81 or from actual gas sample analyses. The Joule Thomson coefficient was calculated from a molar gas analysis using Refprop 23 version 9.0 which is available from NIST2. The term wet gas as used in this paper refers to a flowing natural gas stream, having both a vapor and liquid phase at equilibrium conditions determined by pipeline conditions. The gas is assumed to have been dehydrated and has a water content of less than 7 pounds per million standard cubic feet of gas

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