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CFD Modeling of Reactive Flow During Matrix Acidizing

Hashemi Khoramabad, Mohammad | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52624 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Bazarga, Mohammad; Masihi, Mohsen
  7. Abstract:
  8. Heterogeneity is the major cause of the uneven acid distribution in carbonate acidizing. Traditional acidizing involves the injection of mineral acids, such as hydrochloric acid into the formation, which the bulk of the acidic solution permeates into the high-permeable layers and the low-permeability layers remain unreacted. So far, many chemical and mechanical techniques have been used to avoid the uneven distribution of acid. Using surfactant-based viscoelastic acids is one of the effective chemical method to divert acid to low-permeable zones. The unique feature of these acids is increasing viscosity of acidic solution as the pH increases. In this study, a two-scale continuum model coupling with the viscosifying function that simulate acid injection in two dimension is developed. The purpose of this study is to optimize the acid diversion operation to low-permeable core in a three-step process of acid injection into a dual-core systems. In this process, first hydrochloric acid then viscoelastic surfactant-based acid and finally hydrochloric acid is injected into dual-core system. Optimization for permeability contrast value equal to two, three, four, six, eight and ten has been done. Finally, simple equations are provided to determine the injection duration of each step and the appropriate viscoelastic surfactant-based acid
  9. Keywords:
  10. Matrix Acidizing ; Viscoelastic Surfactant (VES) ; OpenFOAM Software ; Diversion Mechanism ; Dual-Core System

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