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Investigation of diffusion and deposition of TiO2 nanoparticles in sandstone rocks for EOR application

Ehtesabi, H ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.3997/2214-4609.20141545
  3. Abstract:
  4. The diffusion and deposition of TiO2 nanoparticles in EOR application was investigated in this paper. TEM image of nanoparticles showed that the particles are elongated with average long and short axis sizes of 54 and 15 nm. Water flooding tests showed that the recovery factor can be improved from 49% to 80% using TiO2 nanoparticles. Viscosity and interfacial tension measurements showed that by using TiO2 nanoparticles the viscosity of injected fluid and interfacial tension do not change significantly and can not explain the change in recovery factor. Contact angle measurements showed that nanoparticles deposition changed the wettability of the rock surface from oil-wet to water-wet. SEM showed that nanoparticles were deposited uniformly in low concentration but accumulated in high concentration. While in high concentration a lot of long nanorods were observed, smaller nanorods with the same diameter existed in low concentration. This indicated that production of nanorods start in initial stages of nanoparticles deposition. Material balance calculation using ICP indicated that the amount of Ti in outlet fluid is negligible and most of the Ti amounts are deposited on the rock surface. It shows the affinity of TiO2 nanoparticles for deposition on the rock surface which increases recovery factor
  5. Keywords:
  6. Deposition ; Diffusion in liquids ; Nanorods ; Oil well flooding ; Recovery ; Rocks ; Viscosity ; Well flooding ; Flooding tests ; Injected fluids ; Low concentrations ; Material balance ; Recovery factors ; Rock surfaces ; Tension measurement ; TiO2 nano-particles ; Nanoparticles
  7. Source: 76th European Association of Geoscientists and Engineers Conference and Exhibition 2014: Experience the Energy - Incorporating SPE EUROPEC 2014 ; 19 June , 2014 , pp. 1031-1035
  8. URL: http://www.earthdoc.org/publication/publicationdetails/?publication=76414