• Analytical models for onset of sand production under isotropic and anisotropic stresses in laboratory tests 

      Papamichos, Euripides (Journal article; Peer reviewed, 2019)
      Four failure criteria, a simplified Mohr–Coulomb, a Mohr–Coulomb, a von Mises and a Drucker–Prager model are considered for borehole failure and sand onset predictions. The von Mises is a special case of the Drucker–Prager. ...
    • Benchmark study of undrained triaxial testing of Opalinus Clay shale: Results and implications for robust testing 

      Minardi, Alberto; Giger, Silvio B.; Ewy, Russel T.; Stancovic, Rudy; Stenebråten, Jørn; Soldal, Magnus; Rosone, Marco; Ferrari, Alessio; Laloui, Lyesse (Peer reviewed; Journal article, 2020)
      Triaxial testing of argillaceous rocks and shales is significantly more challenging than conventional rock mechanical testing. The challenges are mainly related to the very low permeability of these geomaterials, and their ...
    • Reactive instabilities in linear acidizing on carbonates 

      Papamichos, Euripides; Strongylis, Polyneikis; Bauer, Andreas (Peer reviewed; Journal article, 2020)
      Acid injection, reactive instabilities and wormholing in carbonate reservoirs is investigated through the analysis of the linear acidizing problem theoretically and experimentally. Theoretically acidizing was analyzed by ...
    • Time-dependent closure of a borehole in a viscoplastic rock 

      Xie, Xiyang; Fjær, Erling; Detournay, Emmanuel (Peer reviewed; Journal article, 2019)
      The paper describes a model to predict and analyze the time-dependent closure of a borehole drilled in a soft rock subjected to an initial isotropic stress, and the build-up of stress on a rigid casing after contact with ...