Crude Oil Interfacial Tension Reduction and Reservoir Wettability Alteration with Graphite or Activated Carbon/Silica Nanohybrid Pickering Emulsions

Document Type : Original Research Article


Research Institute of Petroleum Industry (RIPI), P.O. Box 14665-1998, Tehran, Iran


In this research, two carbon structures silica nanohybrids Pickering emulsions were prepared. Graphite and activated carbon were carbon allotropes with different morphologies of laminar and spherical, respectively. The effect of carbon morphology investigated on the related silica nanohybrids Pickeringemulsions for C-EOR. Therefore, nanohybrids were prepared with graphite and activated carbon through the sol-gel method based on different weight percents and two different methods. X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), and Thermal Gravimetric Analysis (TGA) used characterize the synthesized samples. Pickering emulsions of these nanohybrids were prepared by utilizing octane as oil model, suitable anionic surfactants and an alcoholic co-surfactant with pH=7 at room temperature using distilled water. The apparent stability of Pickering emulsion studied over a period of one month. The results of analyses indicated that graphite/silica nanohybrids Pickering emulsions had superior properties for C-EOR in comparison to activated carbon/silica nanohybrids Pickeringemulsions. It concluded that laminar morphology is more significant than the spherical morphology of carbon structure for the mentioned purpose. According to emulsion phase morphology, the optical microscopic images showed that the best samples were 70% graphite/silica (method 2) and 50% activated carbon/silica (method 2). The results of contact angle measurement represented that the 70% graphite/silica nanohybrid (method 2) is more effective on the stone reservoir improvement, which can change the wettability from oil-wet to water-wet. Nanofluid of 70% graphite/silica nanohybrid (method 2) could reduce interfacial tension.


Main Subjects

1.     Pickering, S. U., “CXCVI.—emulsions”, Journal of the Chemical Society, Transactions, Vol. 91, (1907), 2001-2021.
2.     Ramsden, W., “Separation of solids in the surface-layers of solutions and ‘suspensions’(observations on surface-membranes, bubbles, emulsions, and mechanical coagulation).—Preliminary account.”, Proceedings of the Royal Society of London, Vol. 72, No. 477-486, (1904), 156-164.
3.     Tang, M., Wu, T., Xu, X., Zhang, L. Wu, F., “Factors that affect the stability, type and morphology of Pickering emulsion stabilized by silver nanoparticles/graphene oxide nanocomposites”, Materials Research Bulletin, Vol. 60, (2014), 118-129.
4.     Shen, M., Resasco, D. E., “Emulsions stabilized by carbon nanotube-silica nanohybrids”, Langmuir, Vol. 25, No. 18, (2009), 10843-10851.
5.     Delhaes, P., “Graphite and Precursors”, CRC Press, (2014).
6.     Lipson, H., Stokes, A. R., “A New Structure of Carbon”, Nature, Vol. 149 , No. 3777, (1942), 328-328.
7.     He, H., Klinowski, J., Forster, M., Lerf, A., “A new structural model for graphite oxide”, Chemical Physics Letters, Vol. 287, No. 1-2, (1998), 53-56.
8.     Hummers Jr, W. S., Offeman, R. E., “Preparation of Graphitic Oxide”, Journal of the American Chemical Society, Vol. 80, NO. 6, (1958), 1339-1339.
9.     Dillon Jr, E. C., Wilton, J. H., Barlow, J. C., Watson, W. A., “Large surface area activated charcoal and the inhibition of aspirin absorption”, Annals of Emergency Medicine, Vol. 18, No. 5, (1989), 547-552.
 10.   Khosravani, S., Alaei, M., Rashidi, A.  M., Ramazani, A., Ershadi, M., “O/W emulsions stabilized with γ-Alumina nanostructures for chemical enhanced oil recovery”, Materials Research Bulletin, Vol. 48, No. 6, (2013), 2186-2190.
11.   Ershadi, M., Alaei, M., Rashidi, A., Ramazani, A., Khosravani, S., “Carbonate and sandstone reservoirs wettability improvement without using surfactants for Chemical Enhanced Oil Recovery (C-EOR)”, Fuel, Vol.153, (2015), 408-415.
12.   Khosravani, S., Ershadi, M., Alaei, M., Bornaee, A. H., Rashidi, A., Ramazani, A., Manteghian, M., “Compositions and methods employing multi-walled carbon nanotube-based nanohybrids and applications thereof in oil recovery”, U.S.Patent Application 14/622,908.
13.   AfzaliTabar, M., Alaei, M., Khojasteh, R. R., Motiee, F., Rashidi, A. M., “Preference of multi-walled carbon nanotube (MWCNT) to single-walled carbon nanotube (SWCNT) and activated carbon for preparing silica nanohybrid pickering emulsion for chemical enhanced oil recovery (C-EOR)”, Journal of Solid State Chemistry, Vol. 245, (2017),164-173.
14.   AfzaliTabar, M., Alaei, M., Bazmi, M., Khojasteh R. R., Koolivand-Salooki, M., Motiee, F., Rashidi, A. M., “Facile and economical preparation method of nanoporous graphene/silica nanohybrid and evaluation of its Pickering emulsion properties for Chemical Enhanced oil Recovery (C-EOR)”, Fuel, Vol. 206, (2017), 453-466.
15.   AfzaliTabar, M., Alaei, M., Ranjineh Khojasteh, R., Motiee, F., Rashidi, A. M., “ Preference of nanoporous graphene to single-walled carbon nanotube (SWCNT) for preparing silica nanohybrid Pickering emulsion for potential Chemical Enhanced Oil Recovery (C-EOR), Scientia Iranica, Vol. 24, No. 6, (2017), 3491-3499.
16.   Musić, S., Filipović-Vinceković, N., Sekovanić, L., “Precipitation of amorphous SiO2 particles and their properties”, Brazilian Journal of Chemical Engineering, Vol. 28, No. 1, (2011), 89-94.
17.   Zhang, T., Davidson, D., Bryant, S. L., Huh, C., “Nanoparticle-stabilized emulsions for applications in enhanced oil recovery”, In SPE, Improved Oil Recovery Symposium, Society of Petroleum Engineers, Tulsa, Oklahoma, USA, 24-28 April (2010).
18.   Whitby C. P., Wanless, E. J., “Controlling Pickering emulsion destabilisation: a route to fabricating new materials by phase inversion”, Materials, Vol. 9, No. 8, (2016), 626.
19.   Yang, Y., Fang, Z., Chen, X., Zhang, W., Xie, Y., Chen, Y., Liu, Z., Yuan, W., “An overview of Pickering emulsions: solid-particle materials, classification, morphology, and applications”, Frontiers in Pharmacology, Vol. 8, (2017), 287.
  • Receive Date: 16 July 2019
  • Revise Date: 31 December 2019
  • Accept Date: 08 February 2020
  • First Publish Date: 01 March 2020