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QCM Investigation of Different Depositing Factors Effects on the Asphaltene Deposition

Roshani, Mohammad Mahdi | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53717 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghazanfari, Mohammad Hossein; Taghikhani, Vahid
  7. Abstract:
  8. Asphaltene deposition, the heaviest and most polar component of crude oil, which causes great economic damage inside the reservoir, near wells, pipelines and well equipment, is an important challenge in the production of oil reservoirs. The main purpose of this study is to prob the adsorption kinetics and the mechanism of asphaltene adsorption on the metal surface by a quartz crystal microbalance device under different conditions of temperature, flow rate and degree of asphaltene instability. In this study, indirect uv-vis spectroscopic method was used to determine the onset of asphaltene precipitation, then experiments were designed using Taguchi method. A new QCM device has been designed and built to monitor the adsorption and deposition of asphaltene, which has a metal sensor and a flow chamber and can be used at high temperatures. The experimental results show that the adsorption process of toluene-dissolved asphaltene follows the Langmuir adsorption model, so the adsorption of asphaltene particles as a monolayer on the metal surface is confirmed. Moreover, the results demonstrate that the adsorption process in the early times is controlled by adsorption kinetics and for long times is controlled by diffusion. Studies on the adsorption and deposition of asphaltene dissolved in toluene and heptol indicate that, the amount of mass deposited on the surface increases with increasing temperature as well as the percentage of heptol. It is also observed that with increasing flow rate, the amount of mass adsorbed on the surface for toluene-dissolved asphaltene increases while for heptol-dissolved asphaltene it decreases. The results obtained from the application of the Taguchi design technique together with the QCM experiments show that for asphaltene dissolved in heptol at higher temperatures with increasing flow rate the amount of mass on the surface decreases less and Increases from a flow rate onwards
  9. Keywords:
  10. Adsorption ; Flow Assurance ; Asphaltene Deposition ; Quartz Crystal Microbalance (QCM)Experiments ; Taguchi Method

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