Article (Scientific journals)
Gas injection test in the Callovo-Oxfordian claystone: data analysis and numerical modelling
De la Vaissière, Rémi; Gerard, Pierre; Radu, Jean-Pol et al.
2014In Geological Society, London, Special Publications Online First
Peer reviewed
 

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Abstract :
[en] This paper describes a field-scale experiment on gas transport mechanisms performed at Andra’s Underground Research Laboratory (URL) in a clay rock. The experimental layout consists of two parallel boreholes that are equipped with multiple packer completions isolating three intervals each, which have been continuously monitoring the pore pressure evolution of the clay rock. Nitrogen gas was injected in the middle test interval of one of the boreholes at increasing rates. The entire gas test comprised six periods of controlled gas injections, each fol-lowed by a shut-in pressure recovery phase. The experimental data are presented along with their interpretation by means of numerical modelling of two-phase flow of gas and water using different numerical codes and different geometrical approaches that include axisymmetric, half-space and full 3D models. An iterative modelling process was used to show step-by-step how an accu-rate description of each component of the experiment system produced a satisfactory reproduc-tion of the experimental data and an improved understanding of the relevant phenomena. For instance, the initial volume of remaining water in the test interval, and the presence of a damaged zone around the boreholes, was important for the models to obtain good agreement with the field data.
Disciplines :
Civil engineering
Author, co-author :
De la Vaissière, Rémi;  Agence Nationale pour la Gestion des Déchets Radioactifs - ANDRA
Gerard, Pierre;  Université Libre de Bruxelles - ULB
Radu, Jean-Pol ;  Université de Liège - ULiège > Département ArGEnCo > Géomécanique et géologie de l'ingénieur
Charlier, Robert ;  Université de Liège - ULiège > Département ArGEnCo > Géomécanique et géologie de l'ingénieur
Collin, Frédéric  ;  Université de Liège - ULiège > Département ArGEnCo > Géotechnique
Granet, Sylvie;  EDF > Laboratoire de Mécanique des Structures Industrielles Durables
Talandier, Jean;  Agence Nationale pour la Gestion des Déchets Radioactifs - ANDRA
Piedevache, Mérédic;  Solexperts
Helmlinger, Benjamin;  Solexperts
Language :
English
Title :
Gas injection test in the Callovo-Oxfordian claystone: data analysis and numerical modelling
Publication date :
March 2014
Journal title :
Geological Society, London, Special Publications Online First
Publisher :
The Geological Society of London, London, United Kingdom
Peer reviewed :
Peer reviewed
European Projects :
FP7 - 230357 - FORGE - Fate of Repository Gases
Funders :
CE - Commission Européenne [BE]
Available on ORBi :
since 23 May 2014

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