Morphology and Surface Chemistry of Gas-Wetting Nanoparticles and their Effect on the Liquid Menisci in Porous Media
The transformation of the liquid menisci at pore throats is of great importance for mitigating the liquid-blocking effect of condensate reservoirs. Here, we reported a super gas-wetting peanut-like nanoparticle which can facilitate the liquid menisci to transform from concave shape to convex shape by coating a super gas-wetting adsorption with high surface roughness. The morphology and surface chemistry of gas-wetting nanoparticles were investigated by SEM, AFM, and XPS analysis. The mechanism of surface modification was further explored by TEM; the adsorption layer coated on the nanoparticle surface can be recognized as monolayer absorption. The gas-wetting model is recommended as the combination of the Wenzel model and Cassie-Baxter model, which is in close agreement with the results of AFM and contact-angle measurements. Core flooding visualization was performed to identify the effect of gas-wetting alteration on the transformation of liquid menisci in porous media. Results showed that the addition of gas-wetting nanoparticles could decrease the liquid saturations by inducing the transformation of liquid menisci in the pore throat. Additionally, a unique "amoeba effect" and miscibility effect can synergistically improve the mobility of the oil phase, further enhancing the oil recovery.
J. Jin et al., "Morphology and Surface Chemistry of Gas-Wetting Nanoparticles and their Effect on the Liquid Menisci in Porous Media," Industrial and Engineering Chemistry Research, vol. 58, no. 16, pp. 6747-6755, American Chemical Society (ACS), Apr 2019.
The definitive version is available at https://doi.org/10.1021/acs.iecr.8b05525
Geosciences and Geological and Petroleum Engineering
Keywords and Phrases
Chemical analysis; Contact angle; Gases; Liquids; Morphology; Nanoparticles; Oil well flooding; Porous materials; Surface roughness, Adsorption layer; Cassie-Baxter model; Condensate reservoirs; Liquid saturation; Liquid-blocking effects; Nanoparticle surface; Oil recoveries; Wetting model, Wetting
International Standard Serial Number (ISSN)
Article - Journal
© 2019 American Chemical Society (ACS), All rights reserved.
01 Apr 2019