Experimental Investigation on the Interactions between Asphaltenes and Comb-like Octadecyl Acrylate (OA) Polymeric Flow Improvers at the Model Oil/Water Interface

Liu, Daiwei; Zhang, Hao; Li, Chuanxian; Yang, Fei; Sun, Guangyu

doi:10.1021/acs.energyfuels.9b03502

Cited by 9 publications

(7 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the first step, the oil drop/brine system was maintained at 30 °C for 20 min to study the isothermal adsorption behavior of asphaltenes; in the second step, the oil drop/brine system was cooled to 0 °C at a cooling rate of 1 °C/min to evaluate the effect of test temperature and wax precipitation on the interfacial properties. Based on the interfacial pressure difference and the pendant drop contour, the dynamic interfacial tension could be directly calculated through the Young–Laplace equation. − …”

Section: Methodsmentioning

confidence: 99%

“…This controversy is probably caused by the different association state of the asphaltenes. The influences of asphaltene subfractions, − oil solvent composition, organic acids, , resins, oil-soluble polymers , and temperature on the structural strength of the oil–water interfacial films formed by asphaltenes have been studied in detail. The results showed: − the aggregating state of asphaltenes in the oil phase is obviously changed by the above factors, thus influencing the structural strength of asphaltenes interfacial films and the emulsion stability; the more aggregated asphaltenes facilitate the formation of stronger asphaltene interfacial films, and then further improve the emulsion stability.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Asphaltene Concentration and Test Temperature on the Stability of Water-in-Model Waxy Crude Oil Emulsions

Zhao

et al. 2022

ACS Omega

Self Cite

View full text Add to dashboard Cite

In oil fields, the formation of water-in-waxy crude oil emulsion is inevitable. The dissolved/crystallized state wax can interact with asphaltenes and then greatly affect the emulsion stability. However, studies on this aspect are still insufficient. In this work, the effects of the test temperature (30 °C well above the wax appearance temperature (WAT) and 15 °C well below the WAT) and asphaltene concentration (0∼1.5 wt %) on the stability of the water-in-model waxy crude oil emulsions containing 10 wt % wax were systematically investigated. When the model crude oils contain no wax, the flowability of the oils is good and the asphaltene concentration has little influence on the oil rheology. Increasing the asphaltene concentration facilitates the adsorption of asphaltenes to the oil–water interface, thus reducing the interfacial tension and water droplet size while enhancing the interfacial dilatational modulus. The stability of the emulsions improves with the increase in the asphaltene concentration, but the emulsions are still unstable. When the model crude oils contain 10 wt % wax, the WAT slightly decreases from the initial 25 to 24 °C after the addition of asphaltenes. The oil rheology is greatly improved by the addition of 0.05 wt % asphaltenes. With the further increase of the asphaltene concentration, the improved rheological ability of the asphaltenes deteriorates rapidly. At the asphaltene concentration of 1.5 wt %, the oil rheology is dramatically aggravated. The stability of the emulsion containing 10 wt % wax is mainly controlled by two aspects: on the one hand, the dissolved-state wax (30 °C) could facilitate the adsorption of asphaltenes to the interface, further reduce the interfacial tension and the water droplet size, and enhance the interfacial dilatational modulus; on the other hand, the wax crystals precipitated in the oil phase (15 °C) can form a stronger network structure at relatively high asphaltene concentrations (0.5∼1.5 wt %) and then immobilize the water droplets. The above two aspects greatly improve the sedimentation and coalescence stabilities of the emulsions at 15 °C. In addition, we did not find persuasive evidence showing that the wax could crystallize around the water droplets and strengthen the oil–water interfacial films.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Asphaltene Concentration and Test Temperature on the Stability of Water-in-Model Waxy Crude Oil Emulsions

Zhao

et al. 2022

ACS Omega

Self Cite

View full text Add to dashboard Cite

show abstract

“…Hence, the development of these additives is of high industrial relevance. They are generally surfactants or polymers, − but the potential of more exotic chemistries, such as amphiphilic macromolecules or deep eutectic solvents (a class of products formed by the hydrogen bonding between cheap and safe components, e.g. an amine and a carboxylic acid, which represents an alternative to the expensive traditional ionic liquids), has also been evaluated.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulations of Asphaltene Aggregation: Machine-Learning Identification of Representative Molecules, Molecular Polydispersity, and Inhibitor Performance

Pétuya¹,

Punase

Bosoni³

et al. 2023

ACS Omega

View full text Add to dashboard Cite

Molecular dynamics simulations have been employed to investigate the effect of molecular polydispersity on the aggregation of asphaltene. To make the large combinatorial space of possible asphaltene blends accessible to a systematic study via simulation, an upfront unsupervised machine-learning approach (clustering) was employed to identify a reduced set of model molecules representative of the diversity of asphaltene. For these molecules, single asphaltene model simulations have shown a broad range of aggregation behaviors, driven by their structural features: size of the aromatic core, length of the aliphatic chains, and presence of heteroatoms. Then, the combination of these model molecules in a series of mixtures have highlighted the complex and diverse effects of molecular polydispersity on the aggregation process of asphaltene. Simulations yielded both antagonistic and synergistic effects mediated by the trigger or facilitator action of specific asphaltene model molecules. These findings illustrate the necessity of accounting for molecular polydispersity when studying the asphaltene aggregation process and have permitted establishing a robust protocol for the in silico evaluation of the performance of asphaltene inhibitors, as illustrated for the case of a nonylphenol resin.

show abstract

“…Hence, the development of these additives is of high industrial relevance. They are generally surfactants or polymers, [5][6][7][8] but the potential of more exotic chemistries, such as amphiphilic macromolecules 9 or deep eutectic solvents 10 (a class of products formed by the hydrogen bonding between cheap and safe components, e.g. an amine and a carboxylic acid, which represents an alternative to the expensive traditional ionic liquids) has also been evaluated.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulations of asphaltene aggregation: machine learning identification of representative molecules, polydispersity and inhibitor performance

Pétuya¹,

Punase

Bosoni³

et al. 2022

Preprint

View full text Add to dashboard Cite

Molecular Dynamics simulations have been employed to investigate the effect of polydispersity on the aggregation of asphaltene. To make the large combinatorial space of possible asphaltene blends accessible to a systematic study via simulation, an upfront unsupervised machine learning approach (clustering) was employed to identify a reduced set of model molecules representative of the diversity of asphaltene. For these molecules, monodisperse asphaltene simulations have shown a broad range of aggregation behavior, driven by their structural features: size of the aromatic core, length of the aliphatic chains and presence of heteroatoms. Then, the combination of these model molecules in a series of polydisperse mixtures have highlighted the complex and diverse effects of polydispersity on the aggregation process of asphaltene, which yielded both antagonistic, synergistic and seed effects. These findings illustrate the necessity of accounting for polydispersity when studying the asphaltene aggregation process and have permitted to establish a robust protocol for the in-silico evaluation of the performance of asphaltene inhibitors, as illustrated for the case of a nonylphenol resin.

show abstract

Experimental Investigation on the Interactions between Asphaltenes and Comb-like Octadecyl Acrylate (OA) Polymeric Flow Improvers at the Model Oil/Water Interface

Cited by 9 publications

References 38 publications

Effects of Asphaltene Concentration and Test Temperature on the Stability of Water-in-Model Waxy Crude Oil Emulsions

Effects of Asphaltene Concentration and Test Temperature on the Stability of Water-in-Model Waxy Crude Oil Emulsions

Molecular Dynamics Simulations of Asphaltene Aggregation: Machine-Learning Identification of Representative Molecules, Molecular Polydispersity, and Inhibitor Performance

Molecular dynamics simulations of asphaltene aggregation: machine learning identification of representative molecules, polydispersity and inhibitor performance

Contact Info

Product

Resources

About