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Pore scale acidizing Simulation Using Lattice Boltzmann Method

Asghari, Mohammad | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50039 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Jamshidi, Saeed
  7. Abstract:
  8. Matrix acidizing aims at bypassing near wellbore damages in typical carbonate reservoirs or enhancing permeability and hydraulic conductivity in naturally fracture ones. The simulation of acidizing process at pore scale and complex geometries by LBM will lead to gain more knowledge about molecular mechanisms that govern rock dissolution, diffusion and advection of reactive fluid and help the evaluation of acidizing efficiency.In this thesis, simulation of acidizing includes the following steps:
    • Multicomponent fluid convection
    • Fluid diffusion into the solid
    • Fluid-rock reaction
    • Boundary conditions including periodic, bounceback, non-equilibrium bounceback, Dirichlet, Neumann and diffusion-reaction boundary condition
    • Initial conditions
    • Geometry update
    • Dimensionless numbers
    Single phase D2Q9 LBGK method was used in this simulation. Lattice size was at most 200 pixels in each direction. Reaction of hydrochloric acid with pure calcite in carbonate reservoirs was considered at this study and the reaction order was supposed to be one. The reactive fluid consists of hydrochloric acid, calcium chloride and water.Acidizing in channel and pipe, acid diffusion and geometry change are our research issues. Production and consumption of components, the form of channel growing, rock dissolution, the change of porosity and permeability were some of key points at this thesis. The effects of acid molarity, injection rate and reaction rate constants in the formation of wormholes and their final shape were also analyzed. A more complex geometry that consist of multiple interconnected channels and some impurities undergone acidizing process and the permeability and structure changes in specific porosities has been reported. The results were comparable to analytic data, kinetic data, experimental data and the entity of acidizing process in molecular level
  9. Keywords:
  10. Simulation ; Lattice Boltzmann Method ; Acidizing Treatment ; Carbonate Resrevoirs ; Pore-Scale Model ; Matrix Acidizing

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