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Simulation of Drilling Fluid Invasion Containing Nano Clay Particles in Dual Porosity Carbonate Formations Using Pore Network Modeling

Bahrami, Siamak | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57049 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Jamshidi, Saeed
  7. Abstract:
  8. Numerous environmental and industrial applications entail the movement of water and dissolved components like contaminants within aggregated porous media that are characterized by structural, fractured, or macropores in porous media. Over the last few decades, different macroscopic models based on processes have been employed to replicate the transport of contaminants in such environments. A considerable number of these models focus on simulating advective-dispersive transport across relatively extensive inter-aggregate pore domains, with the understanding that interactions within smaller intra-aggregate pores are governed by diffusion. The transfer of nanoparticles between the two domains is frequently depicted using a first-order mass transfer coefficient, typically derived through fitting to observed data. The objective of this research is to comprehend and measure the nanoparticle exchange phenomenon by employing a dual-porosity pore-scale network model on different networks. The analysis of pore-scale outcomes is then conducted based on the conventional dual-porosity transport formulation. We investigated the impact of crucial parameters, particularly aggregate porosity and aggregate permeability, on the principal parameter of the dual-porosity model, namely the mass transfer coefficient. The outcomes were acquired for different aggregate porosities. We also investigated the impact of aggregate permeability by adjusting the sizes of pore throats within the aggregates. Nanoparticle breakthrough curves (BTCs) generated with the pore-scale network model at various positions across the domain were examined through STANMOD software, enabling the estimation of the mass transfer coefficient. An increase in aggregate porosity was observed to increase α, resulting in significant tailing in the BTCs. Variations in the size of aggregate pore throats influenced the relative flow velocity between intra- and inter-aggregate domains. Greater flow velocities within the aggregates caused a change in the transport regime from diffusion-dominated to more advection-dominated. This alteration increased the rate of nanoparticle exchange between the two domains, leading to a corresponding rise in the mass transfer coefficient value and a reduction in tailing observed in the BTCs
  9. Keywords:
  10. Pore Network Model ; Nanoparticles ; Dual Porosity ; Double Porous Media ; Slurries ; Carbonate Resrevoirs

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