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Experimental Investigation of Water and Oil Based Colloidal Gas Aphron Drilling Fluid Performance Containing Nanoparticles in Formation Damage Reduction

Hassani, Amir Hossein | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48778 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghazanfari, Mohammad Hossein; Rashtchian, Davood
  7. Abstract:
  8. In recent years, utilizing the colloidal gas aphron (CGA) drilling fluids is getting more and more commonplace due to their little formation damage and filtration loss. This study tries to investigate the effect of presence of nanoparticles and their type (hydrophobicity) on stability and performance of water and oil based CGA drilling fluids. This is done through analyzing stability, filtration, rheology, and pore blockage tests. Water and oil based CGA drilling fluids consisted of stabilizer, surfactant, and nanoparticles are generated and through examining of the effects of polymer, surfactant, and nanoparticle concentrations, the optimum formulation is obtained. High pressure-high temperature filter press apparatus is designed and assembled in order to simulate the filtration at borehole conditions. In addition, radial core holder and specific type of Hele-shaw cell are designed and used to simulate the drilling fluid invasion to the formation and an assessment of return permeability is obtained. Based on the results, presence of nanoparticles increase the stability and return permeability in radial core holder. Among nanosilica particles with different degrees of hydrophobicity, partially hydrophobic nanosilica provides the best performance for CGA drilling fluid. Also, according to the results of Hele-shaw cell tests, hydrophobic nanoclay improves the properties of CGA drilling fluid more than hydrophobic nanosilica
  9. Keywords:
  10. Hydrophobicity ; Nanoparticles ; Formation Damage ; Rheology ; Stability ; Aphron Drilling Fluid Penetration ; Pore Blockage Ability

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