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Pore Scale Experimental Study of Non-Aqueous Phase Liquid Dissolution, Flow and Distribution in Heterogeneous Porous Media

Ramezanzadeh, Mehdi | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51256 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghazanfari, Mohammad Hossein; Fatemi, Mobeen
  7. Abstract:
  8. In this work, a pore-scale analysis of nonaqueous phase liquid (NAPL) flow, transport, dissolution, and mobilization in heterogeneous and homogeneous porous media was presented. First, dissolution processes and distribution of NAPL phase were investigated using micromodel experiments. The tests were conducted at different injection rates in NAPL-saturated porous media using distilled water, surfactant, and nanoparticles-assisted surfactant. Changes in residual NAPL volume and interfacial area were measured using image analysis method to calculate the mass transfer coefficient, k, and the lumped mass transfer rate coefficient, K. Based on the experimental results, empirical Sherwood correlations were proposed for injection of different fluids. Comparison these correlations with previous empirical correlations in the available literature revealed a much better matching with experimental data. The role of intrinsic interfacial area, a_i, which indicates the morphological characteristics of residual NAPLs on Sherwood correlations were investigated and it was found that this parameter is independent of injection rate except when NAPL saturation is below 5%. In next part of this work, mobilization of dissolving NAPL ganglia was investigated by analysis of forces acting on a trapped NAPL blob. A new dimensionless parameter was defined to quantify the residual blob mobilization. Also, maximum length of trapped NAPL ganglia was obtained analytically at different capillary numbers. This analytical model successfully predicted experimental model at capillary numbers above 〖10〗^(-5). Displacement and dissolution mechanisms were observed in homogeneous micromodel and then local Sherwood number was obtained by single pore analysis. Based on the latter analysis, the values of E_d that is an important input in pore scale simulation methods such as pore network modeling is compared with experimentally measured local Sherwood
  9. Keywords:
  10. Nonaqueous Phase Liquid (NAPL) ; Dissolution ; Mass Transfer ; Micromodel ; Pore-Scale Model ; Heterogeneous Porous Media ; Mobilization

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