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Cristallisation et agglomération de particules d'hydrate de fréon dans une émulsion eau dans huile : étude expérimentale et modélisation

Abstract : This work deals with the problem of pipeline blockage by gas hydrates during oil production. Gas hydrates are crystals resulting from water and gas molecules association under high pressure and low temperature conditions. Such thermodynamical conditions are generally encountered in oil production, particularly for deep offshore fields or cold areas. Due to agglomeration process, hydrate occurrence leads to plug formation.

The main objective of this study is to improve our understanding in the mecanisms involved in the agglomeration process, particularly for water in oil emulsions. Results have allowed us to supply a theorical model of agglomeration. A model system of Ice and Freon hydrates dispersed in xylene with asphaltenes as surfactant is used. As Freon hydrates form under atmospheric pressure at low temperature, it allows us to apply different techniques without being limited by pressure conditions. The Nuclear Magnetic Resonance (NMR) technique is mainly used. It makes the measurement of the ratio between solid hydrogene or fluorine in ice or hydrate and total hydrogen or fluorine in the sample possible - enabling to know the quantity of formed ice or hydrates. Thus, a kinetic study is realized, enabled to know the quantity of ice and hydrate formed. To complete this work, optical microscopy with cooling cell is used to get direct observations of agglomeration. The rheometry technique is also used. It enables us to study the evolution of the apparent viscosity of the system during ice or hydrate formation and plugging. These techniques can also be applied to study real systems like methane hydrates in crude oils under field conditions. Moreover, an interpretation, which couples rheology, crystallisation and agglomeration, is studied and leads to a model.
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  • HAL Id : tel-00372517, version 1

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Emilie Colombel. Cristallisation et agglomération de particules d'hydrate de fréon dans une émulsion eau dans huile : étude expérimentale et modélisation. Sciences de l'ingénieur [physics]. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2008. Français. ⟨tel-00372517⟩

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