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Investigation of CO2-Foam Stability by Using Nanoparticles and Its Effect on Oil Recovery

Nazari Kalejoobi, Meisam | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51175 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Masihi, Mohsen; Shahrabadi, Abbas
  7. Abstract:
  8. One of the most common methods for enhancing oil recovery is gas injection. Because of greenhouse effect and environmental problems, carbon dioxide can be used as injected gas. Low viscosity and high relative permeability of gas make the gas injection as an ineffective EOR method. Foam injection is a good replacement because its mobility is much higher than gas. Usually surfactants are used as foam generator agent but the generated foam is not so stable. Using nanoparticles can improve foam stability for a longer time. In this research study fly ash particles is used as a new stabilizer agent to improve carbon dioxide foam stability. This particles are made of silica, aluminum, iron … Planetary ball mill apparatus is used to reduce the size of fly ash particles. Hydrothermal and solvothermal methods with water and triethanolamine as solvents is proceed respectively and results in surface modification and changing size distribution of particles. Sodium hydroxide as another solvent can be used in hydrothermal method, its reaction with silica results in formation of a new material with different surface properties and particles size. At last sol-gel method is performed using TEOS as precursor. This method increase weight percent of silica and also reduces particles size. In this study effect of 10 different particles on foam stability is checked.
    To prove the application of this particles in foam stability, dispersing conditions in present and absent of SDS is evaluated. For confirming effect of this particles on foam stability, a new device is designed and the liquid drainage of generated foam is recorded with the time. The particles synthesized by hydrothermal, solvothermal and sol-gel method are the best foam stabilizers. Optical microscopic images of the generated foams can be a good verification for stability tests by extracting bubble size distribution and lamella thickness. Interfacial tension and contact angle measurement between dispersion and carbon dioxide is another method to confirm foam stability results.
    The behavior of foam flow in porous media is investigated by micromodel tests. For this reason a fractured pattern is designed which has a high permeability and heterogeneity. Recovery factor of carbon dioxide injection in this pattern has a less than 20 percent. The base sample without presence of nanoparticles is high efficient and leads to a high recovery percent. The samples synthesized by sodium hydroxide reduce recovery compared to base sample. The particles synthesized by sol-gel process are the best foam stabilizers in porous media
  9. Keywords:
  10. Foam ; Enhanced Oil Recovery ; Stability ; Carbon Dioxide ; Nanoparticles ; Fly Ash

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