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High Salinity and High Temperature Stable Colloidal Silica Nanoparticles with Wettability Alteration Ability for EOR Applications
Article

Experimental Investigation of Polymer-Coated Silica Nanoparticles for EOR under Harsh Reservoir Conditions of High Temperature and Salinity

by 1,2,* and 3
1
Department of Chemical Engineering, Faculty of Engineering, Eduardo Mondlane University (EMU), Av. Moç. km 1.5, Maputo CP. 257, Mozambique
2
Centre of Studies in Oil and Gas Engineering and Technology, Eduardo Mondlane University (EMU), Av. Moç. km 1.5, Maputo CP. 257, Mozambique
3
PoreLab Research Centre, Department of Geoscience and Petroleum, Norwegian University of Science and Technology (NTNU), S. P. Andersens veg 15a, 7031 Trondheim, Norway
*
Author to whom correspondence should be addressed.
Academic Editors: Fabien Grasset and Henrich Frielinghaus
Nanomaterials 2021, 11(3), 765; https://doi.org/10.3390/nano11030765
Received: 29 January 2021 / Revised: 22 February 2021 / Accepted: 5 March 2021 / Published: 18 March 2021
(This article belongs to the Special Issue Application of Nanoparticles for Oil Recovery)
Laboratory experiments have shown higher oil recovery with nanoparticle (NPs) flooding. Accordingly, many studies have investigated the nanoparticle-aided sweep efficiency of the injection fluid. The change in wettability and the reduction of the interfacial tension (IFT) are the two most proposed enhanced oil recovery (EOR) mechanisms of nanoparticles. Nevertheless, gaps still exist in terms of understanding the interactions induced by NPs that pave way for the mobilization of oil. This work investigated four types of polymer-coated silica NPs for oil recovery under harsh reservoir conditions of high temperature (60 C) and salinity (38,380 ppm). Flooding experiments were conducted on neutral-wet core plugs in tertiary recovery mode. Nanoparticles were diluted to 0.1 wt.% concentration with seawater. The nano-aided sweep efficiency was studied via IFT and imbibition tests, and by examining the displacement pressure behavior. Flooding tests indicated incremental oil recovery between 1.51 and 6.13% of the original oil in place (OOIP). The oil sweep efficiency was affected by the reduction in core’s permeability induced by the aggregation/agglomeration of NPs in the pores. Different types of mechanisms, such as reduction in IFT, generation of in-situ emulsion, microscopic flow diversion and alteration of wettability, together, can explain the nano-EOR effect. However, it was found that the change in the rock wettability to more water-wet condition seemed to govern the sweeping efficiency. These experimental results are valuable addition to the data bank on the application of novel NPs injection in porous media and aid to understand the EOR mechanisms associated with the application of polymer-coated silica nanoparticles. View Full-Text
Keywords: polymer-coated nanoparticles; core flood; EOR; interfacial tension; wettability alteration; nanoparticle-stabilized emulsion and flow diversion polymer-coated nanoparticles; core flood; EOR; interfacial tension; wettability alteration; nanoparticle-stabilized emulsion and flow diversion
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MDPI and ACS Style

Bila, A.; Torsæter, O. Experimental Investigation of Polymer-Coated Silica Nanoparticles for EOR under Harsh Reservoir Conditions of High Temperature and Salinity. Nanomaterials 2021, 11, 765. https://doi.org/10.3390/nano11030765

AMA Style

Bila A, Torsæter O. Experimental Investigation of Polymer-Coated Silica Nanoparticles for EOR under Harsh Reservoir Conditions of High Temperature and Salinity. Nanomaterials. 2021; 11(3):765. https://doi.org/10.3390/nano11030765

Chicago/Turabian Style

Bila, Alberto, and Ole Torsæter. 2021. "Experimental Investigation of Polymer-Coated Silica Nanoparticles for EOR under Harsh Reservoir Conditions of High Temperature and Salinity" Nanomaterials 11, no. 3: 765. https://doi.org/10.3390/nano11030765

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