On-line monitoring of methane hydrate crystallization process in water-in-oil emulsion using in situ ATR-FTIR spectroscopy
Résumé
The formation of gas hydrates in water-in-oil flowing emulsion was studied in a flow loop pilot at 80 bar and 1°C. The Archimede flow loop (30 m long, 1 cm diameter) has been built to reproduce the thermodynamic and hydrodynamic conditions encountered in pipelines. The crystallization of methane hydrate was investigated for two water contents (5%vol. and 30%vol.) in liquid Kerdane (C1-C14). The hydrate formation was determined from differential pressure drop and temperature measurements and gas consumption. During crystallization process, the time evolution of dissolved methane in liquid phase was obtained from spectroscopy measurements by using ATR-FTIR spectroscopy. Typical spectroscopic measurements are presented which open the possibility to monitor the methane concentration in oil phase. The signal is strongly affected by the presence of water and implies to convert the spectroscopic measurements into methane concentration from an appropriate calibration procedure. The PLS chemometric method based on multivariate data analysis method was applied in this study with success allowing to obtaining highly valuable information about the crystallization process.
Domaines
Génie des procédés
Origine : Fichiers produits par l'(les) auteur(s)
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