Morphology of MoS2 nanosheets and its influence on water/oil interfacial tension: A molecular dynamics study

Yong-jian, Feng; Hou, Jirui; Yang, Yumeng; Wang, Zhen; Wang, Dongsen; Cheng, Tingting; You, Zhenjiang

doi:10.1016/j.fuel.2021.122938

Cited by 12 publications

(7 citation statements)

References 46 publications

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“…These results are in line with previous studies; results of previous research have shown significant reduction in IFT between the oil phase and the water phase due to the presence of plate-shaped nanoparticles at the interface, suggesting that nanosheets/nanoparticles are surface-active agents, and their surface activity increased in the presence of surfactants. The modification of nanoparticle surfaces with surfactants significantly improved the dispersity of the nanofluids.…”

Section: Resultssupporting

confidence: 93%

Experimental and Computational Fluid Dynamics Investigation of Mechanisms of Enhanced Oil Recovery via Nanoparticle-Surfactant Solutions

et al. 2023

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The enhancement in surfactant performance at downhole conditions in the presence of nanomaterials has fascinated researchers’ interest regarding the applications of nanoparticle-surfactant (NPS) fluids as novel enhanced oil recovery (EOR) techniques. However, the governing EOR mechanisms of hydrocarbon recovery using NPS solutions are not yet explicit. Pore-scale visualization experiments clarify the dominant EOR mechanisms of fluid displacement and trapped/residual oil mobilization using NPS solutions. In this study, the influence of multiwalled carbon nanotubes (MWCNTs), silicon dioxide (SiO2), and aluminum oxide (Al2O3) nanoparticles on the EOR properties of a conventional surfactant (sodium dodecyl benzene sulfonate, SDBS) was investigated via experimental and computational fluid dynamics (CFD) simulation approaches. Oil recovery was reduced with increased temperatures and micromodel heterogeneity. Adding nanoparticles to SDBS solutions decreases the fingering and channeling effect and increases the recovery factor. The simulation prediction results agreed with the experimental results, which demonstrated that the lowest amount of oil (37.84%) was retained with the micromodel after MWCNT-SDBS flooding. The oil within the micromodel after Al2O3-SDBS and SiO2-SDBS flooding was 58.48 and 43.42%, respectively. At 80 °C, the breakthrough times for MWCNT-SDBS, Al2O3-SDBS, and SiO2-SDBS displacing fluids were predicted as 32.4, 29.3, and 21 h, respectively, whereas the SDBS flooding and water injections at similar situations were at 12.2 and 6.9 h, respectively. The higher oil recovery and breakthrough time with MWCNTs could be attributed to their cylindrical shape, promoting the MWCNT-SDBS orientation at the liquid–liquid and solid–liquid interfaces to reduce the oil–water interfacial tension and contact angles significantly. The study highlights the prevailing EOR mechanisms of NPS.

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Section: Resultssupporting

confidence: 93%

Experimental and Computational Fluid Dynamics Investigation of Mechanisms of Enhanced Oil Recovery via Nanoparticle-Surfactant Solutions

et al. 2023

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“…The black nano-sheet adsorbs on the oil/water interface layer automatically, as shown in Figure 3 [17,19], and moves with the migration of the oil/water interface layer, so it has the ability to automatically find the remaining oil, and can aggregate the oil droplets into wall. When the oil/water interface advances to the dominant channel, the black nano-sheet will form an oil slug from the peeled oil film, increase the flow resistance in the dominant diversion channel, realize the automatic transfer of the subsequent liquid to other secondary channels, and intelligently guide the flow of the displacement medium.…”

Section: Super-strong Amphiphilic Interface Performancementioning

confidence: 99%

“…It can be seen from Figure 5 that since the sheet-like structure of the black nano-sheet is in the same order of magnitude as the size of the colloidal asphaltene macromolecules, the viscosity reduction mechanism mainly relies on the black nano-sheet infiltrating into the layered structure of the colloidal asphaltene to destroy the C-S bond, The overlapping aggregates are disassembled, their continuous state is broken, and the crude oil is emulsified into a micro-nano-scale O/W emulsion, thus forming a viscosity reduction [17,18,20].…”

Section: Super-strong Emulsification and Viscosity Reduction Abilitymentioning

confidence: 99%

“…As shown in Figure 6, the structural separation pressure formed by the black nano-sheet, thereby "scooping up" the oil droplets and the oil film on the surface of the porous medium, and the swirl occurs due to the flexible curling, twisting and deformation during the flow process. The disturbance forms a swirling flow and elutes discrete residual oil droplets, forming a near-piston displacement [17,21]. When the black nano-sheet contacts the surface of the porous medium, the wettability of the surface will change from oil wetting to neutral wetting or water wetting.…”

Section: Super-strong Oil Washing Abilitymentioning

confidence: 99%

“…Black nano-sheet is a Janus amphiphilic nanomaterial with both lipophilic hydrocarbon chain and hydrophilic structure. Its small size, large specific surface area, and high specific surface energy can form "surface-surface" contact with the oil-water interface [16][17][18]. The interface activity is much higher than the "point-surface" contact of surfactants, and the contact efficiency is high.…”

Section: Introduction To Black Nano-sheet Oil Recovery Technologymentioning

confidence: 99%

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Effect Analysis and Recognition of 2-D Black Nano-SHEET in Different Karst Reservoirs in Tahe Oilfield

Zhang

Hou

Sun

et al. 2022

Advances in Transdisciplinary Engineering

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Due to the long-term development of water and gas injection in Tahe Oilfield, the production increase effect decreases year by year. Based on the understanding of the treatment difficulties of water injection and gas injection in the development stage of the fractured vuggy reservoir in Tahe Oilfield, this paper combined with the theoretical analysis of Nano-sheet technology at this stage, such as super amphiphilic interface performance, super emulsification and viscosity reduction ability, ultra-low core adsorption, and super oil washing ability, and has carried out the field application of 2-D black nano-sheet oil displacement in the fractured vuggy reservoir in Tahe Oilfield for a total of 15 wells. Through the oil increase evaluation and comparison of well groups with different inter-well displacement types and different karst reservoir spaces after the application of Nano-sheet, it is found that the well groups with good inter-well connectivity composed of weathered crust underground river karst reservoir space had a high degree of effectiveness. It is the best-selected area for field application. The mine receiving efficiency was as high as 85.7%, and the oil increase is significant, with a cumulative oil increase of more than 5000 tons. It provides practical guidance and a theoretical basis for the follow-up development of 2-D black nano-sheet oil displacement technology in the fractured vuggy reservoir of Tahe Oilfield.

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Enhancing oil recovery by alkane-modified molybdenum disulfide nanosheets with the optimum alkyl chain length: The balance between dispersity and hydrophobicity to achieve high interfacial activity

Geng,

Yang,

et al. 2024

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Morphology of MoS2 nanosheets and its influence on water/oil interfacial tension: A molecular dynamics study

Cited by 12 publications

References 46 publications

Experimental and Computational Fluid Dynamics Investigation of Mechanisms of Enhanced Oil Recovery via Nanoparticle-Surfactant Solutions

Experimental and Computational Fluid Dynamics Investigation of Mechanisms of Enhanced Oil Recovery via Nanoparticle-Surfactant Solutions

Effect Analysis and Recognition of 2-D Black Nano-SHEET in Different Karst Reservoirs in Tahe Oilfield

Enhancing oil recovery by alkane-modified molybdenum disulfide nanosheets with the optimum alkyl chain length: The balance between dispersity and hydrophobicity to achieve high interfacial activity

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