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<p>Plug and abandonment (P&amp;A) of oil and gas wells is a challenging operation due to the high costs involved and the environmental risks associated with underground fluid leakage. These concerns have increased interest in improving P&amp;A practices, including the use of creep-prone rock formations, such as shale or salt, to displace into the annular space and form an impermeable barrier. This paper develops two numerical models (plane strain and axisymmetric) in ABAQUS to evaluate annular closure in a shale formation. The models include the initial and boundary conditions and a theoretical field scenario representative of a Brazilian well. The simulation is done in three stages (geostatic, drilling, and post-drilling), and the rock behavior is modeled as poro-visco-elastoplastic in all stages. The results indicate that, for the selected stress state, pore pressure, and rock properties, the formation can fully close the annular space in less than two years and develop a sustained contact pressure compatible with regulatory barrier requirements.</p>

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Numerical Simulation of Wellbore Closure Due to Shale Creep-Part I: A Poro-visco-elastoplastic Approach

  • 期刊论文

  • 发表日期：

    2026年1月29日

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  • C. B. Morales-Monsalve,
  • S. A. B. Fontoura,
  • R. F. Lomba,
  • L. Machado

摘要

Plug and abandonment (P&A) of oil and gas wells is a challenging operation due to the high costs involved and the environmental risks associated with underground fluid leakage. These concerns have increased interest in improving P&A practices, including the use of creep-prone rock formations, such as shale or salt, to displace into the annular space and form an impermeable barrier. This paper develops two numerical models (plane strain and axisymmetric) in ABAQUS to evaluate annular closure in a shale formation. The models include the initial and boundary conditions and a theoretical field scenario representative of a Brazilian well. The simulation is done in three stages (geostatic, drilling, and post-drilling), and the rock behavior is modeled as poro-visco-elastoplastic in all stages. The results indicate that, for the selected stress state, pore pressure, and rock properties, the formation can fully close the annular space in less than two years and develop a sustained contact pressure compatible with regulatory barrier requirements.