Method for modeling the crystallization of paraffins in petroleu

Details Method for modeling the crystallization of paraffins in petroleu Method for modeling the crystallization of paraffins in petroleu

1997-09-16

2000-03-28

Myers, Helane

Mineral oils: processes and products

Paraffin wax; treatment or recovery

208 27, 208 37, 208309, 208351, 585501, 436 55, C10B 7300

Patent

active

060427159

ABSTRACT:
A thermodynamic model is formed which allows determination of the temperature at which waxes or paraffins appear in petroleum fluids, and notably in crudes, as well as the solid fraction that precipitates when the temperature of the petroleum fluid falls below this critical value. A differentiation is established between n-paraffins, iso-paraffins, naphthenes and aromatics. The model utilizes an analytical representation of the fluids by pseudo-components, the physico-chemical parameters of most of them being determined by combination of the corresponding parameters of a certain number of pure hydrocarbons gathered in a database. The model takes account of the non-ideality of the solid, liquid, and gas phases. Two of the pseudo-constituents including the heaviest fractions are represented by two ficticious molecules, each being defined by a molar distribution among various groups which constitute them, and a group contribution method is used to calculate the thermodynamic properties thereof. The method can be applied for optimization of the production and the transportation of petroleum fluids by means of pipes.

REFERENCES:
SPE International Symposium on Oilfield Chemistry, 18-2 Fevrier 1997, Texas USA pp. 283-290, Calange et al "Onset Crystallization Temperature and Deposit Amount for Waxy Crudes: Experimental Determination and Thermodynamic Modelling. "

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