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An Experimental Study of the Influence of the Preflush Salinity on Enhanced Oil Recovery Using Silica-Based Nanofluids

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  • Tola Sreu

    (Resources Production and Safety Engineering Laboratory, Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan)

  • Kyuro Sasaki

    (Resources Production and Safety Engineering Laboratory, Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan
    Institute for Future Engineering (IFENG), Tokyo 135-8473, Japan)

  • Yuichi Sugai

    (Resources Production and Safety Engineering Laboratory, Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan)

  • Ronald Nguele

    (Resources Production and Safety Engineering Laboratory, Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan)

Abstract

The underlying effect of preflush salinity and silica nanofluid (Si-NF) on oil production is examined. The influence of salinity on the stability of Si-NFs is studied. A series of sand-pack floodings evaluating oil production was conducted at different concentrations of preflush salinity (0 to 4 wt.%), followed by the injection of a Si-NF (0.5 wt.%) at the trail of which postflush water was injected. The effluent water and solids were collected and analyzed using X-ray fluorescence (XRF). Interfacial tension (IFT) and contact angle measurements were conducted on the Si-NF in the presence of salinity to confirm the effect. The Si-NF became unstable and formed precipitate in the presence of salinity. The sand-pack flooding showed that when the preflush salinity was increased, the displacement efficiency ( E D ) using the Si-NF and postflush injection was increased ( E D = 44%). The XRF of the precipitated effluent revealed that the preflush salinity and Si-NF caused mineral leaching, which triggered pore clogging. The IFT value reduced from 13.3 to 8.2 mN/m, and the wettability was altered to be more strongly water-wet when the salinity increased. The primary mechanisms of oil recovery using the Si-NF after preflush salinity is attributed mainly to the clogging mechanism. This clogging helps block the high-perm area, shift the fluid flow to the oil-trapped zone, and free the oil out. Other contribution mechanisms are IFT reduction and wettability alteration.

Suggested Citation

  • Tola Sreu & Kyuro Sasaki & Yuichi Sugai & Ronald Nguele, 2021. "An Experimental Study of the Influence of the Preflush Salinity on Enhanced Oil Recovery Using Silica-Based Nanofluids," Energies, MDPI, vol. 14(21), pages 1-17, October.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:21:p:6922-:d:661630
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    References listed on IDEAS

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    1. Xiaofei Sun & Yanyu Zhang & Guangpeng Chen & Zhiyong Gai, 2017. "Application of Nanoparticles in Enhanced Oil Recovery: A Critical Review of Recent Progress," Energies, MDPI, vol. 10(3), pages 1-33, March.
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