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Experimental Investigation of Micro-Bubble Based Drilling Nano Fluids on Formation Damage Reduction in Heterogenous Porous Media

Tabzar, Amir | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47309 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghazanfari, Mohammad Hossein; Rashtchian, Davood
  7. Abstract:
  8. Drilling of low pressure layers is one of the major problems in petroleum industry, in which requires a lightweight drilling fluid for drilling of these layers. Use of lightweight Colloidal Gas Aphron (CGA) leads to loss reduction of drilling fluid, decreases formation damage and finally, well stimulation costs will be reduced. Use of nanoparticles can improve the aphron drilling fluid performance. But there is little information in the literature about the role of natural surfactant in the presence of nanoparticles on the CGA based fluid properties. Especially, micro bubbles behavior in the presence of nanoparticles in pore scale is less considered. This study consists of two parts, in the first part, rheology behavior, stability and fluid loss of aphron fluids has been studied and the effect of natural and chemical surfactants and also bio-polymers in the presence of silica and fumed silica nanoparticles on the aphron fluid behavior has been investigated. In the second part, by injection of aphron fluid in the micro model with non-fractured thin section and fractured thin section patterns, the formation damage created by aphron fluid is investigated and the type of flow pattern, saturation fluid and aphron formulation has been investigated. The results show that aphron fluids have a better performance compared to polymer based fluids and surfactant based fluids. Also, Olea Europaea natural bio-surfactant was able to generate aphron microbubbles like SDS and CTAB commercials surfactants and improved the performance of the aphron fluids. Adding silica and fumed silica nanoparticles to aphron fluid formulation increased the performance of these fluids, in which these nanoparticles have an optimum concentrations in improving aphron fluids performance at 0.286 w/v % and 0.429 w/v %, respectively. The results of micro model tests showed that aphron fluids generated by both SDS and Olea Europaea surfactants lead to formation damage reduction and return permeability. Both of nanoparticles have an optimum concentration at 0.286 w/v %. Also, on average, aphron fluids lead to return 80 % permeability compared to original permeability. The flow of aphron microbubbles in both patterns are investigated by microscopic visualization. The result of this study can be helpful for better understanding of nanoparticles-aphron fluids behavior in pore and fracture blocking ability
  9. Keywords:
  10. Aphron Based Fluids ; Stability ; Nanoparticles ; Rheology ; Formation Damage ; Olive Europaea Biosurfactant ; Filtration Loss

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