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The interest in using gas for poro-mechanical experiments. Applications to COx argillite and tight gas sandstones.

type de publication      communication internationale avec actes publiés
date de publication 18-04-2011
auteur(s) Skoczylas Frédéric
  
conférence Symposium on Mechanics and Physics of Porous Solids, A tribute to Prof. Olivier Coussy
     dates de 18-04-2011 à 20-04-2011
     lieu Champs sur Marne, France
     nom des actes Proceedings of the Symposium on Mechanics and Physics of Porous Solids, A tribute to Prof. Olivier Coussy
  
pages 337 – 352
ISBN / ISSN 1628-4704
résumé The objective of this contribution is to show that gas is a very well adapted fluid to poro-mechanical experiments and investigations. Although it is unable to access all the poro-mechanical properties such as un-drained ones, the use of gas (argon) is very interesting for numerous reasons: it is a neutral fluid with respect to the solid phase, its molecules can reach the thinnest porosity and the pore fluid pressure control is easier than with liquid. Under appropriate testing conditions, gas allows the measurements of properties for a partially water-saturated medium. All these advantages are presented through two particular applications on COx argillite and tight gas sandstones. A new experimental investigation technique allowed us to show that, under common conditions of constant saturation, whatever its value, COx argillite behaves as a Terzaghi material which is a real progress in the knowledge of this particular clayrock. Other experiments conducted on tight gas sandstones have shown that the sensitivity of gas relative permeability towards confining pressure is mainly due to the trapping of pores into the rock matrix. These voids are connected by micro-cracks that can be closed under increasing confinement, leaving less space for the fluid to flow.
mots clés Poro-mechanical experiments, gas relative permeability
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