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CFD Simulation of Rotating Disk Apparatus for Determining Reaction Equation Parameters of VES and Carbonate Minerals

Ghasemi, Esmaeil | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54332 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Bazargan, Mohammad; Jamshidi, Saeed
  7. Abstract:
  8. Acidizing operation is performed in oil and gas reservoirs with the aim of overcoming formation damages, increasing permeability and reducing skin factor. In carbonate reservoir, the hydrochloric acid increases the permeability of the areas around the well to a more than its initial value by dissolving part of the formation minerals. Considering that most of Iran's oil and gas reservoirs are in the category of carbonate reservoirs, it is important to study the reaction kinetics of carbonate minerals and acids used in acidizing operation. The complex and multifactorial nature of the acidizing operation in the reservoirs has made it very difficult to design a successful and optimal operation. So far, a lot of research has been done in various aspects of acid processing operations, in order to better understand the phenomenon of dissolution of reservoir rock by acid, the behavior of wormholes, secondary reactions and finally the design of a successful acid treatment operation. The most important requirement for the validity of all the above-mentioned research is complete knowledge of the kinetics of heterogeneous reaction of acid and mineral. One of the most widely used experiments to study heterogeneous reactions in the oil and gas industry is the rotary disk apparatus (RDA) experiment. The existing analytical model is mainly used to evaluate the results of RDA test. These models have major weaknesses, the most important of which is the inability to model non-Newtonian acids. For this purpose, first, the experiment of the Rotating disk apparatus for viscoelastic surfactant based acids (VES) with non-Newtonian rheological behavior has been numerically modeled in OpenFOAM software. An optimization algorithm is proposed in order to use the numerical model and extract the “reaction equation parameters” from the RDA test. This algorithm is designed by examining the behavior of the reaction rate function using gradient-based methods. It should be noted that the convergence rate of this algorithm is much higher compared to other optimization methods. In other words, the proposed algorithm is efficient for all values of the “reaction equation parameters” and the number of times to evaluate the function is less than other optimization methods. Finally, the efficiency of CFD modeling and optimization algorithm for the parameters of dolomite and calcite minerals is evaluated. It is observed that with less than 100 times of evaluation of the objective function, the values of the “reaction equation parameters” for dolomite and calcite minerals are determined with an error of less than 0.1%
  9. Keywords:
  10. OpenFOAM Software ; Optimization ; Viscoelastic Surfactant (VES) ; Reaction Kinetics ; Acidizing Treatment ; Rotating Disks ; Reservoirs Acidizing

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