Published:Journal of Chromatographic Science,
ISSN 0021-9665 Volume
47, Number 5, May/June 2009, pp. 373-377
New Method for Stock-Tank Oil Compositional Analysis
Kristine McAndrews, John Nighswander, Konstantin
Kotzakoulakis, Paul Ross, and Helmut Schroeder
Oilphase-DBR, Schlumberger, P.O. Box 16818, Jebel Ali, Dubai,
U.A.E.
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.
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