Fluid Characterization in a Gas Condensate Reservoir: The Effect of Lumping Techniques

International Journal of Bio-Inorganic Hybrid Nanomaterials

دوره 10، شماره 2، تیر 2021، صفحه 73-81   

نوع مقاله: Research Paper

چکیده

Several problems are associated with “regrouping” the original components into a smaller
number without losing the predicting power of the equation of state. These problems include (A) How
to select the groups of pure components to be represented by one pseudo-component. (B) What
mixing rules should be used for determining the EOS constants (pc, Tc, and ω) for the new lumped
pseudo- components? In this paper the results of the lumping methods are compared with the data for
gas condensate systems to find accurate lumping method for accurate fluid characterization. For this
purpose, Whitson’s lumping scheme, Pedersen lumping scheme, Danesh et al. lumping scheme, Lee
et al. lumping scheme, Behras and Stanndler lumping scheme are used as lumping scheme and Lee
mixing rules was used for calculation of thermodynamics properties of lumped group. To compare the
Impact of each Lumping method, its effect was examined on the phase diagram. The results show that
the Whitson lumping scheme (it is grouping the hydrocarbon from C7 to C16+ into 4 groups) can predict
the phase diagram of this gas condensate systems fluid with good approximation, the Pedersen lumping
scheme (it is grouping the hydrocarbon from C7 to C16+ into 3 groups ) can predict the phase diagram
of this gas condensate systems fluid somewhat and the Pedersen lumping schemes and Danesh et al.
lumping schemes (it is grouping the hydrocarbon from C7 to C16+ into 4 groups) approximately predicted
the same phase diagram and the Lee et al. lumping scheme (it is grouping the hydrocarbon from C7
to C16+ into 3 groups) can predict the phase diagram of this gas condensate systems fluid exactly.
Therefore, the Lee at al. lumping scheme has very good accuracy compared to the other methods. Also,
All Lumping Scheme has an effect on dew point line of phase diagram.

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