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Sealing Efficiency of Bentonite/Sand Plugs: effect of gas pressure and location of gas pathways

type de publication      communication internationale avec actes publiés
date de publication 05-02-2013
auteur(s) Liu Jiangfeng; Davy Catherine A.; Skoczylas Frédéric; Talandier Jean
  
conférence International Symposium and workshop on gas generation and migration - under the auspices of the FORGE FP7 EU project
     dates de 05-02-2013 à 07-02-2013
     lieu Luxembourg
     nom des actes Actes du International Symposium and workshop on gas generation and migration - under the auspices of the FORGE FP7 EU project (article de 4 pages)
  
  Sous presse
résumé This study is an original contribution to understand the mechanism of gas transport in clay barriers and preferential gas pathways. Prior to gas breakthrough tests, bentonite samples are subjected to water pressure or both water and gas pressure for one or two months. To investigate the sealing efficiency of the interface between bentonite-sand plug and its surrounding (i.e. in situ claystone), three kinds of tubes are used, namely, a Plexiglass-aluminumTM tube, an argillite tube and a dedicated aluminium tube with a grooved inner surface. Experimental results show that continuous gas breakthrough can be detected at 7MPa or more for a plug swelling without gas pressure, while gas can pass through the plug very easily for plugs swelling with water and a 4MPa gas pressure. No continuous gas breakthrough is found for a plug tested without surrounding tube. Gas permeability tests are performed on bentonite/sand plugs at different saturation levels under varying confinement: gas tightness can be obtained when saturation degree is more than 86% at an in-situ confinement, on the order of 7MPa.
mots clés clay barriers, bentonite-sand plug, gas breakthrough, gas permeability
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