Morphology and Surface Chemistry of Gas-Wetting Nanoparticles and Their Effect on the Liquid Menisci in Porous Media

Abstract

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.

Experimental Investigation and Mathematical Modeling of Gas Diffusivity by Carbon Dioxide and Methane Kinetic Adsorption

“…The existence of carbon dioxide or methane would be considered as the influential parameter of the flow that is called sorption. Moreover, regarding the previous numerical and analytical modeling of the gas transportation in the porous media of shale layers, Knudsen diffusion mechanism would consider as the dominant mechanism in the gas flow rate of shale matrixes. , Yuan et al (2014) were experimentally evaluated the profound impact of particle size on the gas diffusion and adsorption. Hence, it was concluded that Knudsen and Fickian diffusion were the dominated phenomena on the gas transportation of shale gas layers.…”

Oxygen-Vacancy-Rich BiO2–x/Ag3PO4/CNT Composite for Polycyclic Aromatic Hydrocarbons (PAHs) Removal via Visible and Near-Infrared Light Irradiation

“…Besides, there exists a subpeak at approximately 134.6 eV due to the deposition of the oxidized P (P x O y ) on carbon, , as shown in Figure e. Figure f illustrates that the peaks located at 284.8 and 286.2 eV can be ascribed to the CC bond and −COOH group, which further verified the presence of the carboxyl group on CNT …”

“…Figure 5f illustrates that the peaks located at 284.8 and 286.2 eV can be ascribed to the CC bond and −COOH group, which further verified the presence of the carboxyl group on CNT. 39 3.6. TGA Analysis.…”

Salt-Responsive Zwitterionic Polymer Brush Based on Modified Silica Nanoparticles as a Fluid-Loss Additive in Water-Based Drilling Fluids

“…With the deepening of oil production in subsurface reservoirs, the rheology of drilling fluid is difficult to be effectively controlled, which can easily cause borehole instability, barite settlement, sticking, and other drilling accidents. , Because of lattice substitution, clay minerals in drilling fluids have negative charges on their surface, which adsorb cations to form diffusion layers. , The increase of sodium ions will significantly increase the number of cations in the diffused electric double layer of clay particles, thus compressing the electric double layer, reducing the thickness of the diffused electric double layer and the ζ-potential on the surface of the particles. , In this case, the electrostatic repulsion of clay particles decreases, the hydration film becomes thinner, and the dispersion of particles decreases, which makes the rheological properties of drilling fluid worse and causes frequent drilling accidents …”