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Chemical Influence of Pore Pressure on Brine Flow in Clay-Rich Material

  • Etienne CassiniEmail author
  • Danila Mylnikov
  • Roman Makhnenko
Conference paper
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG)

Abstract

Hydromechanical properties of shales are complex due to the involved material structure, with the solid matrix being mainly formed by swelling clays and porosity dominated by nanometer scale tortuous voids with large aspect ratios. Intrinsic permeability of restructured Opalinus Clay (Swiss shale) brought to shallow geological storage conditions was measured with in situ brine. Under constant temperature, vertical stress, and downstream fluid pressure, steady-state flow experiments show a significant trend of permeability decrease with increasing differential (upstream minus downstream) fluid pressure, thus contradicting the conventional Darcy’s description. To interpret these experimental measurements, brine permeability is derived using a one-step self-consistent homogenization scheme based on the knowledge of material’s pore structure. While mechanical and thermal effects cannot explain the permeability decrease, the trend is reproduced with the correct order of magnitude by considering a chemical effect: a pore size reduction in the sample due to water adsorption at mineral surface.

Keywords

Intrinsic Permeability Intact Material Klinkenberg Effect Accessible Porosity Pore Size Reduction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

Opalinus clay cores were provided by Swisstopo in the framework of Mont Terri project, CS-C experiment. R. Makhnenko acknowledges the support from SCCER-SoE (Switzerland) grant KTI.2013.288 and Swiss Federal Office of Energy (SFOE) project CAPROCK #810008154.

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Etienne Cassini
    • 1
    Email author
  • Danila Mylnikov
    • 1
  • Roman Makhnenko
    • 1
    • 2
  1. 1.Laboratory of Soil Mechanics – Chair “Gaz Naturel” PetrosvibriSwiss Federal Institute of Technology (EPFL)LausanneSwitzerland
  2. 2.Department of Civil and Environmental EngineeringUniversity of Illinois at Urbana-ChampaignUrbanaUSA

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