Inhibition of asphaltene precipitation by hydrophobic CaO and SiO₂ nanoparticles during natural depletion and CO₂ tests
by Yaser Ahmadi; Babak Aminshahidy
International Journal of Oil, Gas and Coal Technology (IJOGCT), Vol. 24, No. 3, 2020

Abstract: This paper addressed the effects of hydrophobic synthesized calcium oxide (CaO) and commercial silicon dioxide (SiO₂) nanoparticles on the inhibition of asphaltene precipitation after asphaltene adsorption on the nanoparticles surface. CO₂-oil interfacial tension (IFT) behaviours and batch experiment results were used for surveying asphaltene adsorption in the presence of nanoparticles, and natural depletion and CO₂ tests were done as a source of precipitation methods. The studied crude oil was located inunstable regions from the aspect view of asphaltene precipitation with a colloidal instability index (CII) of 1.392. The Langmuir isotherm modelled the asphaltene adsorption data well in the presence of both nanoparticles. Based on the results of CO₂-oil interfacial tension, batch experiment and asphaltene precipitations during natural depletions and carbon dioxide tests, CaO not only adsorbed more asphaltene in compared to SiO₂ but also had the best application for precipitation inhibition. [Received: May 24, 2018; Accepted: October 24, 2018]

Online publication date: Mon, 01-Jun-2020

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