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Preventing Shale Instability (PSI)

The semi-analytical model PSI (Preventing Shale Instability) analysis time dependent borehole stability in shale and sandstone formations.

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The model incorporates through approximate expressions:

  • linear elasticity w/ tensile and brittle shear failure + plasticity + strength anisotropy
  • shale-fluid interaction through osmosis + ionic exchange
  • time evolution of stability limits due to chemical and thermal effects plus pore pressure diffusion

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