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Modeling of Acid Transport in Fractured Porous Media Using Extended Finite Element Method

Salehi Sichani, Ali | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52848 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khoei, Amir Reza
  7. Abstract:
  8. Modeling and simulation of acid transport in fractured porous medium and the formation of wormholes are the main goals of this dissertation. Injection of acid in rocks is one of the enhanced oil recovery methods which is extensively used in industry. The flow of acid in a porous medium produces a highly permeable path which is called wormholes. The formation of these wormholes is dependent on parameters of rock, acid and injection properties. As a result, simulation and prediction of this phenomenon are very important for optimization. Some researches developed methods to model this phenomenon in porous media but few of them investigated discontinuities in a medium. This research uses reactive formulation in porous medium, averaging and using continuum media, and discretization using extended finite element method and Newmark method to model reactive transport in rocks, which contain both porous medium and cracks with different orientations and openings, more accurately. By using the extended finite element method, which is a more accurate and optimum algorithm in discontinuous media, there is no need for mesh conformation to cracks. This will decrease the computational costs. After calculation of weak form, the formulation is discretized in space and time by using the extended finite element method and Newmark method, respectively. Coupled formulations are solved using the Newton-Raphson method. The model is verified using other numerical results. After that, new examples are solved by changing some parameters like number and orientation of cracks, acid and porous medium characteristics, injection parameters and mesh type
  9. Keywords:
  10. Extended Finite Element Method ; Porous Media ; Acid Transport ; Reactive Transport ; Crack in Porous Media ; Generalized Newmark Method

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