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Etude de la cinétique de formation des hydrates de méthane dans les fluides de forage off-shore par analyse calorimétrique différentielle haute pression

Abstract : Oil based drilling fluids are used in offshore drilling operations to cool and lubricate the drilling bit, to transport the cuttings to the surface and to maintain the hydrostatic pressure in the well. With the increasing depth of offshore drilling, the thermodynamic conditions (high pressure and low temperature) are favourable to the formation of gas hydrates in the water-in-oil emulsions contained in the fluids. High pressure Differential Scanning Calorimetry (DSC) is a proven technique for the study of thermodynamic equilibrium of the system gas - water - hydrate. DSC was chosen to study the kinetics of hydrate formation because it is particularly well adapted to complex dispersed media. A study was curried out at variable pressure from 11 to 40 MPa and at variable sub-cooling degree from 14 to 30 K. Hydrate formation kinetics was studied in four fluids of different compositions. Performed experiences highlight the effect of different kinetic parameters. The use of classic models allowed representing the experimental results for low and high driving forces. Furthermore, we developed a kinetic model which combines the theory of the crystallization, the statistical aspect of nucleation and the mass balance on different components of the drilling fluid.
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https://pastel.archives-ouvertes.fr/pastel-00002186
Contributor : Ecole Mines Paristech <>
Submitted on : Thursday, February 15, 2007 - 8:00:00 AM
Last modification on : Wednesday, July 3, 2019 - 10:48:04 AM
Long-term archiving on: : Thursday, September 30, 2010 - 7:58:51 PM

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  • HAL Id : pastel-00002186, version 1

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Néjib Hamed. Etude de la cinétique de formation des hydrates de méthane dans les fluides de forage off-shore par analyse calorimétrique différentielle haute pression. Chimie. École Nationale Supérieure des Mines de Paris, 2006. Français. ⟨pastel-00002186⟩

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