Displacement of oil by SiO<sub>2</sub>-nanofluid from a microporous medium: microfluidic experiments

Pryazhnikov, Andrey I.; Минаков, А. В.; Pryazhnikov, M. I.; Жигарев, В. А.; Немцев, И. В.

doi:10.1088/1742-6596/2150/1/012019

Cited by 2 publications

(1 citation statement)

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“…In the challenging high-salt and low-permeability reservoir conditions, this nano-SiO 2 material was more effective than water flooding, leading to a significant 14.6% increase in oil recovery. Pryazhnikov et al 36 conducted microfluidic experiments to model the oil displacement process of nano-SiO 2 in porous media. They found that changing the wettability could increase the oil recovery rate by 16%.…”

Section: Introductionmentioning

confidence: 99%

Impact of the Nano-SiO₂ Particle Size on Oil Recovery Dynamics: Stability, Interfacial Tension, and Viscosity Reduction

Cheng,

Yang,

Yan

et al. 2024

Energy Fuels

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Nanofluids, as a novel material for tertiary oil recovery, have shown promising potential in enhancing water flooding efficiency in low-permeability reservoirs and increasing oil recovery rates. However, the risk of particle agglomeration arises when the particle size is too small. Challenges such as maintaining dispersion stability, efficient long-distance transportation of nanofluids, and preventing particle retention and agglomeration have emerged as key obstacles hindering the widespread adoption and large-scale implementation of nanoflooding technology in enhancing oil recovery in various reservoir conditions. With issues such as poor nanoparticle dispersion stability, costly reprocessing, and limited reservoir fluid compatibility addressed, nano-SiO 2 particles with average sizes of 45, 170, and 625 nm were synthesized using an enhanced particle size control technique based on the Stober method. The impact of these different particle sizes on dispersion, emulsion stability, oil−water interfacial tension (IFT), and viscosity reduction before and after modification with fatty alcohol polyoxyethylene ether (AEO) were investigated. The findings demonstrate that modified nano-SiO 2 exhibits enhanced stability and reduced oil−water IFT. At a primary AEO concentration of 0.25 wt %, micellar structure formation synergizes with SiO 2 to achieve optimal IFT reduction. Smaller SiO 2 particle sizes are more amenable to surface modification and exhibit superior adsorption capacity at the oil−water interface compared to larger particles, facilitating the interaction with asphaltene aggregates and, thereby, enhancing crude oil flowability. In a study, 170 nm nanosized SiO 2 demonstrated a substantial viscosity reduction effect, with an apparent viscosity reduction rate of 95.3% at 0.0025 wt % SiO 2 + 0.25 wt % AEO under test conditions of 45 °C and 5 s −1 , indicating a significant viscosity reduction effect. This research introduces a novel concept for designing nanofluids to repel oil in low-permeability tight oil reservoirs, establishing an oil repulsion system. These findings not only advance the theoretical understanding of enhanced recovery in such reservoirs but also contribute to the efficient development of conventional and unconventional oil and gas fields, including deep shale gas and ultraheavy and thick oil reservoirs.

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Section: Introductionmentioning

confidence: 99%

Impact of the Nano-SiO₂ Particle Size on Oil Recovery Dynamics: Stability, Interfacial Tension, and Viscosity Reduction

Cheng,

Yang,

Yan

et al. 2024

Energy Fuels

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A Systematic Microfluidic Study of the Use of Diluted Silica Sols to Enhance Oil Displacement

Pryazhnikov,

Lobasov

et al. 2024

Nanomaterials

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The paper presents the results of a systematic microfluidic study of the application of nanosuspensions for enhanced oil recovery. For the first time, approximately a dozen nanosuspensions prepared by the dilution of silica sols as displacement fluids were considered. The concentration of nanoparticles in the suspensions varied from 0.125 to 2 wt%, and their size ranged from 10 to 35 nm. Furthermore, the silica sols under consideration differed in their compositions of functional groups and pH. The effects of concentration, nanoparticle size, fluid flow rate, and the viscosity of the displaced oil were investigated using microfluidic technology. The microfluidic experiments demonstrated that the application of nanosuspensions for water flooding has significant potential. The efficiency of oil displacement by nanosuspensions was found to increase significantly (up to 30%) with the increasing concentration and decreasing average size of nanoparticles. The application of nanosuspensions for the enhancement of oil recovery is most appropriate for reservoirs with highly viscous oil.

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Displacement of oil by SiO₂-nanofluid from a microporous medium: microfluidic experiments

Cited by 2 publications

References 10 publications

Impact of the Nano-SiO₂ Particle Size on Oil Recovery Dynamics: Stability, Interfacial Tension, and Viscosity Reduction

Impact of the Nano-SiO₂ Particle Size on Oil Recovery Dynamics: Stability, Interfacial Tension, and Viscosity Reduction

A Systematic Microfluidic Study of the Use of Diluted Silica Sols to Enhance Oil Displacement

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Displacement of oil by SiO2-nanofluid from a microporous medium: microfluidic experiments

Cited by 2 publications

References 10 publications

Impact of the Nano-SiO2 Particle Size on Oil Recovery Dynamics: Stability, Interfacial Tension, and Viscosity Reduction

Impact of the Nano-SiO2 Particle Size on Oil Recovery Dynamics: Stability, Interfacial Tension, and Viscosity Reduction

A Systematic Microfluidic Study of the Use of Diluted Silica Sols to Enhance Oil Displacement

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Displacement of oil by SiO₂-nanofluid from a microporous medium: microfluidic experiments

Impact of the Nano-SiO₂ Particle Size on Oil Recovery Dynamics: Stability, Interfacial Tension, and Viscosity Reduction

Impact of the Nano-SiO₂ Particle Size on Oil Recovery Dynamics: Stability, Interfacial Tension, and Viscosity Reduction