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Modeling the Damage Caused by Air Penetration During Air Drilling by Using the Lattice Boltzmann Method

Zamani Nokabadi, Mohammad Hassan | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57269 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Jamshidi, Saeed; Vasheghani Farahani, Mehrdad
  7. Abstract:
  8. Multiphase flows in porous media hold significant importance in industrial processes and natural phenomena, being related to topics such as hydrocarbon recovery, groundwater flow, catalysts, and fuel cells. In recent decades, numerous experimental methods have been employed to study these issues, enabling the observation of dynamic interface behavior on a large scale, although accurately describing fluid flow details at the pore scale remains challenging. Laboratory studies using micromodels can predict the fingering patterns and their initial growth but do not provide useful information about the evolution and growth of fingering in later stages. Numerical simulators can complement theoretical and experimental studies, offering an efficient tool to examine the effects of flow and physical parameters in complex three-dimensional porous environments. However, continuum-based numerical methods are insufficient for investigating the impact of pore-scale parameters on bulk properties at a large scale, thus failing to detail the flow patterns at the pore scale in porous media. The Lattice Boltzmann Method (LBM) is recognized as a powerful tool for simulating multiphase flows at the pore scale, offering significant advantages over traditional computational fluid dynamics (CFD) methods. Due to its parallel computational capability and ease of handling complex geometric boundaries, LBM is particularly suitable for simulating multiphase flows in porous environments. In this study, LBM with a phase-field approach is employed to investigate formation damage during air drilling, given the high density and viscosity differences in such conditions. Due to the absence of commercial simulators using this approach, a two-phase simulator core was developed using C++ programming language. Initially, simulation results were validated against theoretical solutions for both single-phase and two-phase cases, showing acceptable errors. Subsequently, simulations were conducted in capillary tubes and synthetic porous media, examining flow patterns and the effect of density ratio on these patterns
  9. Keywords:
  10. Lattice Boltzmann Method ; Phase Field Model ; Pore-Scale Model ; Large Density Ratio ; Viscosity Ratio ; Air Drilling ; High Viscosity Ratio

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