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Hydrodynamique de l'accumulation des dépôts de paraffines dans les conduites pétrolières

Abstract : The wax deposit issue in wells and pipelines is very expensive to oil companies. That is why the prediction of this wax deposit is critical to optimize its management. In this thesis, it is proposed that the deposit could result from flow patterns caused by rheological factors. Indeed, thermodynamic properties create the onset of wax crystals, and diffusion mechanisms result in the displacement and accumulation of wax in a particular region. This results in rheological changes that modify the flow pattern and create an unyielded region near the wall, namely a wax deposit. To highlight this process, experimental tests of wax deposition were performed on the Lyre loop at IFP-Lyon. Results show some insights that confirm our approach. A more simple and efficient experimental facility "Cylindrical Couette" was designed. This tool is able to reproduce the main deposit mechanisms and can supply some critical parameters as diffusion coefficient. In parallel we develop a numerical model accounting for the main physical phenomena which have been observed experimentally: viscoplastic temperature dependent material coupled with a Fick diffusion equation for wax. This model captures qualitatively the progressive built up of a wax deposit in a pipeline but the computation time is very important. We adapt this numerical model to the simplified Couette geometry which has been experimentally developed. The computation time is more reasonable and the results are in agreement with the preliminary experimental results.
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Submitted on : Wednesday, April 22, 2009 - 2:30:30 PM
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  • HAL Id : tel-00377593, version 1

Citation

Amine Benallal. Hydrodynamique de l'accumulation des dépôts de paraffines dans les conduites pétrolières. Mécanique [physics.med-ph]. École Nationale Supérieure des Mines de Paris, 2008. Français. ⟨NNT : 2008ENMP1603⟩. ⟨tel-00377593⟩

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