Experimental Investigation of Surface Properties and Wettability Using Super Gas Wetting Surface Modified Multi-Nano-Composites

Shayesteh, Mohammad | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53154 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghazanfari, Mohammad Hossein; Fakhroueian, Zahra
  7. Abstract:
  8. Recently, the researchers try to identify the application of nanofluids for wettability alteration. Changing the wettability of reservoirs, which gas injects to them, to gas wet can lead to enhanced oil recovery. Although several studies have been conducted to introduce proper nanofluids for altering the wettability of reservoirs to gas wet, there is not enough study to investigate the application of nanocomposites for wettability alteration of carbonate reservoirs. In this study, 20 nanoparticles with different compositional structures were synthesized, and then various nanofluids were prepared for the experimental survey. Also, the potential of these nanofluids for wettability alteration to super gas wet through static contact angle experiments and spontaneous imbibition were investigated. The pure water, kerosene, and crude oil from one of the Iranian oil fields were used. In addition, the advancing and receding contact angle and the kinetics and equilibrium adsorption experiments were done to survey the pattern of gas/liquid front in the porous media. The results of adsorption experiments reveal that the equilibrium amount of adsorption is multilayer, and they follow Freundlich’s adsorption isotherm. Also, the results match with the second-order adsorption model. The contact angle results show that the FS and TiO2/SiO2 F samples can lead to the super gas wet. Moreover, the effect of droplet volume on the static contact angle was investigated. Furthermore, the results of imbibition experiments indicate that imbibition of water and kerosene after treatment of rock with the FS nanofluid decrease 85% and 80% for the water and kerosene, respectively. The XRD and XRF characterization experiments illustrate that the sample rock is calcite, which has a few dolomites. The SEM images show the perfect coating of the samples. Also, the analysis of EDX and EDX-map verify not only the existence of fluorine but also its perfect distribution. The dynamics contact angles show that the advancing contact angle increases to 160 when the volume and the diameter of drop increase, and then the contact angle will be constant, which has some minimal fluctuations. In addition, the receding of water drop on the nanofluids coated surfaces shows that the drop initially sticks to the surface, and the contact angle will decrease as the drop volume decreases. Then, after sticking, the slipping starts, and the radius of drop decreases, so the receding of drop on the surface will be observed, which is in agreement with the pattern of the time-dependent receding contact angle. Therefore, the results of this study confirm the potential of composite nanoparticles for altering the reservoir wettability into the super gas wet for EOR
  9. Keywords:
  10. Wettability Alteration ; Nanofluid ; Contact Angle ; Spontaneous Imbibition ; Super Gas-Wet ; Gas Wetting Condition

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