Title: Inhibition of asphaltene precipitation by hydrophobic CaO and SiO2 nanoparticles during natural depletion and CO2 tests

Authors: Yaser Ahmadi; Babak Aminshahidy

Addresses: Department of Petroleum Engineering, Amirkabir University of Technology (Polytechnic), Tehran, Iran ' Department of Petroleum Engineering, Amirkabir University of Technology (Polytechnic), Tehran, Iran

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]

Keywords: CaO nanoparticle; SiO2 nanoparticle; asphaltene precipitation; asphaltene adsorption.

DOI: 10.1504/IJOGCT.2020.107555

International Journal of Oil, Gas and Coal Technology, 2020 Vol.24 No.3, pp.394 - 414

Received: 24 Apr 2018
Accepted: 24 Oct 2018

Published online: 19 Apr 2020 *

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