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Title: Characterization Of Heavy Components In Ngl And Natural Gas Extended( Analysis)
Author: Mark F. Maxwell
Source: 1993 International School of Hydrocarbon Measurement
Year Published: 1993
Abstract: The mystery of the hexanes or heptanes plus fraction has become less of a mystery with the advent of the extended analysis. Prior to the use of an extended analysis NGL and natural gas samples were analyzed by chromatography and the heavy components were grouped as a single peak. This single peak was considered to be the hexane or heptane plus peak. See Figures 1 and 2. Due to the fact that the content of this single peak was not known, assumptions had to be made. The physical constants assigned to the heavy components of the sample were at best an educated guess. Errors were introduced into the mass measurement of NGL and the gas volume measurement of natural gas. The extended analyses, as outlined in GPA Standard 2186 and 2286, does allow for a more comprehensive analysis of the heavy components in NGL and natural gas, however the methods do have limitations. This paper will give an overview of these two standard methods of extended analysis.

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