Experimental study of gas hydrate formation and destabilisation using a novel high-pressure apparatus

A novel variable-volume type high-pressure apparatus has been designed, constructed and used for gas hydrate investigations. The apparatus has an operating temperature ranging from 253 K to 473 K and pressure ranging from 0.1 MPa to 60 MPa. Its central component consists of a viewing windows cell to...

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Bibliographic Details
Published in:	Marine and petroleum geology Vol. 27; no. 6; pp. 1157 - 1165
Main Authors:	Ruffine, L., Donval, J.P., Charlou, J.L., Cremière, A., Zehnder, B.H.
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier Ltd 01-06-2010 Elsevier
Subjects:	Carbon dioxide Chromatography Destabilisation Earth sciences Earth, ocean, space Exact sciences and technology Formation Gas hydrates Gas phases Hydrates Hydrocarbons Liquids Marine Marine geology Natural gas Novel apparatus Operating temperature Raman spectroscopy Sciences of the Universe Sedimentary rocks Spectrometers Thermogenic Novel apparatus Destabilisation Thermogenic Carbon dioxide Gas hydrates Raman spectroscopy Formation Chromatography experimental studies carbon dioxide Raman spectra interfaces dissolution monitoring high pressure natural gas gas hydrates dissociation chromatography temperature growth destruction
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Summary:	A novel variable-volume type high-pressure apparatus has been designed, constructed and used for gas hydrate investigations. The apparatus has an operating temperature ranging from 253 K to 473 K and pressure ranging from 0.1 MPa to 60 MPa. Its central component consists of a viewing windows cell to which several sensors or analytical instruments can be connected. At its present configuration, a Raman spectrometer and a gas chromatograph are connected for the study of the liquid (or solid) and the gas phases respectively. The apparatus was used for the study of two different systems. The first system was composed of carbon dioxide (CO 2) and water for which the hydrate formation and dissolution has been investigated by injecting water into liquid CO 2. The evolution of the system was monitored by means of visual observation in combination with Raman spectroscopy. The second system consists of thermogenic-like gases (i.e. synthetic natural gas) for which the hydrate formation and dissociation have additionally been investigated by monitoring the change of the vapour phase composition. The consequences of the destruction of the hydrate skin formed at the water–gas interface have been studied. Thus, an attempt has been made to study the importance of the interfacial contact layer between the gas phase and the aqueous phase for the hydrate growth process. In this paper, we describe in detail the apparatus, followed by the presentation of the results on both systems investigated.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0264-8172 1873-4073
DOI:	10.1016/j.marpetgeo.2010.03.002