Abstract
Characterization of reservoir fluids involves separation of the fluids into single carbon number (SCN) fractions by boiling at temperatures equivalent to the boiling points of the normal paraffins and then making measurements of the mole percentage, specific gravity, and molecular weight of each fraction. The specific gravity and molecular weight can be obtained by measurements of the SCN fractions obtained by true boiling point separations, and the mole percentage up to C19 can be obtained by chromatographic analysis. Such measurements have been carried out for seven Trinidad condensate samples. Plots of mole percentage against carbon number showed two discontinuities that are at variance with the generally accepted continuous exponential relationship, one at C8 and the other at C13, because of isomers present in the C7 and C9 fractions, which are also present in C8 but at a higher percentage and similarly for C13. The measured weight average boiling point, specific gravity, and molecular weight of each fraction when compared with generalized published data showed a difference of less than 4.0%. This new observation and new data should be taken into consideration when splitting the C7 plus fraction for representative equation of state predictions.
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