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Evaluation the Effect of Molecular-Structural Properties of Asphaltene Fraction on Wettability Alteration and Crude Oil Dynamic Flow in Porous Media

Bastami, Dariush | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55696 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Taghikhani, Vahid; Shahrabadi, Abbas; Naderi, Hassan; Taheri Shakib, Jaber
  7. Abstract:
  8. In order to investigate the effect of molecular-structural properties of asphaltene fraction on changes in wettability and flow of crude oil in the porous medium, four crude oil samples from oil fields in southern Iran were tested ;To know the characteristics of crude oil, molecular-structural properties of asphaltene fraction and the effect of asphaltene fraction on the wettability properties of surface, Experiments such as crude oil density and viscosity measurement, crude oil hydrocarbon analysis, asphaltene extraction with standard IP-143 method, elemental analysis and metal content, gel permeation chromatography, nuclear magnetic resonance, interaction between rock and asphaltene. using solvents (toluene, chloroform, methanol, tetrahydrofuran and hydrochloric acid), Field emission scanning electron microscope analysis, Fourier transform infrared spectrometer analysis, Zeta potential analysis, measurement of the contact angle of the droplet with the surface, Determining the onset of asphaltene precipitation and finally, a glass micromodel covered with calcite was used; Based on the results, sample B crude oil, by creating an angle of 163.53 degrees with the calcite surface, is the maximum Spreading on the surface caused the maximum percentage of destruction of the porous medium caused by asphaltene deposition with the amount of 18.36% and the maximum amount of adhesion of asphaltene to the surface after washing with toluene solvent with the amount of 24.16%; Therefore, more than other samples, it makes the surface oil-wetting ;The wetting properties that occurred on the surface were due to the high aromatic and aliphatic compounds of the asphaltene of this sample, and the polar compounds were less effective; According to the results, the surface morphology of calcite and asphaltene fractions changed during the solvent washing process, and no correlation was observed between surface wettability and surface electrostatic properties; Also, the de-asphaltene crude oil sample had less tendency to spread on the surface
  9. Keywords:
  10. Wettability ; Micromodel ; Asphaltene Fraction ; Electrostatic Properties ; Molecular-Structural Properties ; Porous Media

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