New method for stock-tank oil compositional analysis

Kristine McAndrews*, John Nighswander, Konstantin Kotzakoulakis, Paul Ross, Helmut Schroeder

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A new method for accurately determining stock-tank oil composition to normal pentatriacontane using gas chromatography is developed and validated. The new method addresses the potential errors associated with the traditional equipment and technique employed for extended hydrocarbon gas chromatography outside a controlled laboratory environment, such as on an offshore oil platform. In particular, the experimental measurement of stock-tank oil molecular weight with the freezing point depression technique and the use of an internal standard to find the unrecovered sample fraction are replaced with correlations for estimating these properties. The use of correlations reduces the number of necessary experimental steps in completing the required sample preparation and analysis, resulting in reduced uncertainty in the analysis.

Original languageEnglish
Pages (from-to)373-377
Number of pages5
JournalJournal of Chromatographic Science
Issue number5
Publication statusPublished - May 2009


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