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MICROSCOPIE SOUS HAUTE PRESSION POUR LA MESURE DE TEMPERATURE DE FUSION FINISSANTE DE SYSTEMES PARAFFINIQUES

Abstract : During their exploitation and transport, petroleum fluids undergo high variations in temperature and pressure that are likely to bring about solid deposits. In order to understand the behaviour of these fluids, it is necessary to have reliable experimental data which describes their phase diagram accurately, with the aim of creating predictive thermodynamic models. In this work, a high pressure microscopy device was developed to make up for the inadequacies of the existing techniques in the field of solid – liquid equilibria; it allows the measuring of the solid disappearance temperature of miscellaneous systems in the 0.1 – 100 MPa pressure range, for temperatures between 243 and 373 K. At first, this device was used to study the influence of pressure and of the number of carbon atoms on the melting temperature of pure compounds encountered in petroleum fluids (normal alkanes, alkylcyclohexanes and alkylbenzenes). This study revealed a relationship between the slopes of the liquidus curves in a (T, P) diagram and the crystalline structure of the melting solid phase. Then solid disappearance temperatures of several synthetic mixtures were studied according to pressure. A modelling of the results was proposed for each system by taking the influence of the crystalline structure on the slopes of the liquidus curves into account. The high pressure microscope permitted the study of reservoir fluids and eventually a discussion about the size of the crystals that appear in such systems is proposed.
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Contributor : Michel Milhet <>
Submitted on : Wednesday, February 23, 2011 - 4:54:43 PM
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Michel Milhet. MICROSCOPIE SOUS HAUTE PRESSION POUR LA MESURE DE TEMPERATURE DE FUSION FINISSANTE DE SYSTEMES PARAFFINIQUES. Physique [physics]. Université de Pau et des Pays de l'Adour, 2006. Français. ⟨NNT : 2 0 0 6 P A U U 3 0 4 4⟩. ⟨tel-00568869⟩

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