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Numerical Simulation of Acidizing (HCl)Process in Carbonate Reservoirs

Gorjipoor, Fatemeh | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53764 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Pishvaie, Mahmoud Reza
  7. Abstract:
  8. Carbonate Matrix acidizing in order to improve or increase initial permeability, leads to different dissolution patterns under different operating and environmental conditions. In a specific rock / reactive fluid system, when a reactive fluid injects into the system in an optimal velocity, the dissolution pattern proceeds like a finger, names Wormhole. Formation of Wormhole is known as a success in acidizing process, because of its optimum porosity and permeability evolution and minimum pore volume injected of reactive fluid to breakthrough. So prediction of optimum injection velocity and analysis of dissolution patterns variation by change in operational and environmental conditions, result in cost optimization and raising the possibility of success. In this regard, Two-Scale Continuum Model was developed for simulation of acidizing in core scale that explains the system in both of Darcy and pore scale. Over recent years, several studies have been performed to improve the model results, but most of them used ideal dimensionless numbers in order to analyze the model and rarely clarified the numerical simulation approach and challenges.In this study first the simulation time was optimized by choosing a proper method in order to estimate boundary values of variables, distinguishing sufficient number of control volumes and describing a new variable(C_f ) ̅. Then an innovative algorithm was used in order to calculate pressure and velocity of the reactive fluid and simulate a wide range of dissolution patterns by that in a 2D heterogeneous system. The active region of the dissolution mechanisms was analyzed too.Finally based on a real case Hydrochloric acid injection into Limestone cores, good estimation of Two Scale Continuum Model in injection velocities bigger than optimum velocity and weak estimation of it in low injection velocities was recognized. Change in wormhole formation was analyzed by change in system parameters. As a result, the wormhole forms better in a longer and more heterogeneous system in transverse direction
  9. Keywords:
  10. Hydrochloric Acid ; Finite Volume Method ; Numerical Simulation ; Wormhole ; Matrix Acidizing ; Reactive Fluid ; Two-Scale Continuum Model

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