Micromechanism of partially hydrolyzed polyacrylamide molecule agglomeration morphology and its impact on the stability of crude oil−water interfacial film

Wang, Zhihua; Xu, Yunfei; Gan, Yifan; Han, Xue; Liu, Wenbo; Xin, Hua

doi:10.1016/j.petrol.2022.110492

Cited by 32 publications

(21 citation statements)

References 41 publications

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“…The higher content of asphaltenes, resins, waxes, and other interfacial active substances in crude oil will lead to a greater apparent viscosity and a stronger non-Newtonian property of the W/O emulsion, showing a more significant shear thinning effect. This agrees with the results from the previous work …”

Section: Resultsmentioning

confidence: 99%

“…First, the stirring torques of these single-phase Newtonian fluids at different stirring speeds were measured, and then, the correlations between the viscosities and stirring torques at different stirring speeds were determined by regression analysis of equation μ = f ( M ). The unstable O/W emulsions were stirred at different preset speeds (speed range of 200–700 rpm), and the torque values during the mixing process were recorded. Then, the apparent viscosities of unstable O/W emulsions at corresponding stirring speeds were calculated by the regression equation μ = f ( M ). Furthermore, eq was able to calculate the shear rate corresponding to different stirring speeds − so that the change in apparent viscosities of unstable O/W emulsions with the shear rate can be determined. γ̇̅ = 2 π M N / ( μ V ) where γ̇̅ is the average shear rate, s –1 ; M is the stirring torque, N·m; V is the fluid volume, m 3 ; and N is the stirring speed, r/s.…”

Section: Methodsmentioning

confidence: 99%

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Modeling of the Phase Inversion Point of Crude Oil Emulsion by Characterization of Crude Oil Physical Properties

et al. 2022

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Accurate prediction of the phase inversion point (PIP) of crude oil emulsion (COE) will give important guiding significance to the mixed transportation technology during the crude oil mining process. The influence of water cut of a system on viscosity characteristics of the COE was studied by emulsification experiments with 16 kinds of crude oils having significant differences in physical properties. The results showed that under the condition of low water cut of a system, the crude oils can emulsify all the water to form stable W/O emulsions with apparent viscosities much higher than those of pure crude oils. When the water cut of a system exceeds a certain critical value, the crude oils have no ability to emulsify all water; instead, they are wrapped by a water phase and form unstable O/W emulsions, and their apparent viscosities decrease sharply compared with those of pure crude oils. The critical water cut of a system corresponding to the abrupt change of apparent viscosity of the COE is the PIP of the COE changing from the type of W/O to O/W. Furthermore, the apparent viscosities of stable W/O emulsions decrease with increasing shear rate and temperature and meanwhile increase dramatically with the increasing water cut of a system. The apparent viscosities of unstable O/W emulsions decrease with increasing shear rate, water cut of a system, and temperature and are far lower than those of pure crude oils. Four typical parameters were chose as the representation to describe the crude oil physical properties (COPPs), that is, the content of saturates, the content of aromatics, the content of surfactants, and the crude oil acid number. On the basis of the quantitative description of COPPs, a prediction model for the PIP of the COE was established. The results of model verification showed that the mean relative deviation of prediction results was 2.9%.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Modeling of the Phase Inversion Point of Crude Oil Emulsion by Characterization of Crude Oil Physical Properties

et al. 2022

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“…Asphaltenes are the heaviest component of crude oil with a high content of heteroatom (oxygen, nitrogen, and sulfur) and high polarity, and the most typical C5Pe model was employed in this paper . The SPC model was used for water molecules. ,,, The epoxy resin, polyurethane, and epoxy silicone resin were chosen as the coating materials for their non-toxic, non-polluting, fast curing, strong adsorption, and good densification characteristics, and they are also the most commonly used coating material in the oilfield. , The molecular models for each component are shown in Figure a.…”

Section: Simulationmentioning

confidence: 99%

“…42 The SPC model was used for water molecules. 9,10,37,43 The epoxy resin, polyurethane, and epoxy silicone resin were chosen as the coating materials for their non-toxic, non-polluting, fast curing, strong adsorption, and good densification characteristics, and they are also the most commonly used coating material in the oilfield. 27,29 The molecular models for each component are shown in Figure 2a.…”

Section: Simulationmentioning

confidence: 99%

“…Although the transition to a green and low-carbon energy structure has become a global consensus, crude oil will continue to play an indispensable role in the carbon neutral process as core energy for national strategy and development. − Waxy crude oil consists of a complex mixture of various organic compounds, including waxes (saturated alkanes or n -alkanes), aromatics, isoalkanes, resins, and asphaltenes. It is distributed in most oil fields in various countries and even accounts for 90% of the total oil production in China. − Asphaltenes, an essential component of crude oil, are a series of disordered organic macromolecules, which are high in polarity and molecular weight, and aggregate very easily. − At high temperatures, waxes are dissolved in the crude oil in the molecular state, while asphaltenes are dispersed in the form of nanoparticles. During pipeline transportation, asphaltenes agglomerate into small particles as the external environment varies, and the long chain wax molecules precipitate out as wax crystals and deposit on the pipeline inner wall together with asphaltenes and other components, which weakens the flowability of the oil flow, reduces the effective flow area, and even causes the pipeline blockage. ,− However, the deposition processes of waxes and asphaltenes have previously been less investigated systematically, the crude oil was simply regarded as a system of waxes and other components, and the synergistic effect of waxes and asphaltenes in the deposition process was ignored. ,− …”

Section: Introductionmentioning

confidence: 99%

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Effect of a Coated Wall on Wax–Asphaltene Molecule Diffusion, Aggregation, and Adhesion Mechanism: A Molecular Dynamics Simulation Study

Wang

Liu

et al. 2022

Energy Fuels

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Coating is increasingly used as a cost-effective strategy for controlling heavy component deposition in waxy crude oil transportation flowlines. This paper systematically investigated the micro influence mechanism of the coated wall on the diffusion, aggregation, and adhesion behavior of wax–asphaltene molecules by the molecular dynamics (MD) method. A set of experiments was performed to determine the properties of the waxy crude oil. For overcoming the limitations of the model simplification of previous MD studies, the MD models based on experimental data were developed to characterize the motion behavior of wax–asphaltene molecules on non-coated and coated wall surfaces, and the simulated densities of crude oil components had an error of less than 5% with the National Institute of Standards and Technology (NIST) data, which showed that the established model was accurate and reliable. The simulation results showed that two condensate oil layers were formed on the non-coated wall surface, the diffusion and aggregation behavior of wax–asphaltene molecules were enhanced under the low-temperature condition, and there was considerably heavy component molecules adhesion to the non-coated wall surface. The analysis of mean square displacement, radial distribution function, and relative concentration distribution revealed that 288.15 K was the peak wax precipitation, which was consistent with the experimental conclusion. It was also found that the presence of low surface energy coating weakened the diffusion of heavy component molecules. The epoxy silicone-coated had the weakest interaction with wax–asphaltene molecules. Moreover, the fact that the coated wall had a certain inhibitory effect on the aggregation and adhesion of wax–asphaltene molecules in the pipeline was proven, where the epoxy silicone-coated had the strongest inhibitory effect. These investigations present new insights and guidance for controlling heavy component deposition by coating in the pipeline transportation process of waxy crude oil.

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Preparation and performance study of functional polymer with self demulsifying

Chen,

Zhao,

Zhang

et al. 2023

Can J Chem Eng

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In polymer flooding, the residual polymer in the produced fluid can increase the stability of crude oil emulsion, thereby negatively affecting the demulsification process. Therefore, a polymer that has no effect on the stability of crude oil emulsion is required. Herein, a polymerizable monomer with a demulsification function (MD) was synthesized and then copolymerized with acrylamide, acrylic acid, and 2‐acrylamide‐2‐methylpropane sulfonic acid to prepare a novel copolymer (self‐demulsifying polymer, PDM). The dissolution time, solution viscosity, shear resistance, static adsorption on quartz sand, and the effect on the crude oil emulsion stability of PDM were compared with those of regular polyacrylamide (PAM). Experimental results showed that owing to the steric hindrance effect of MD, the molecular weight of PDM was lower than that of PAM. Both polymers exhibited satisfactory solubility, solution viscosity, shear resistance, and static adsorption, which can meet the requirements of polymer for use in oil displacement. However, in contrast to PAM, PDM had no negative effect on the crude oil emulsion stability. This study provides a new solution to the problem of increased crude oil emulsion stability in polymer flooding.

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Micromechanism of partially hydrolyzed polyacrylamide molecule agglomeration morphology and its impact on the stability of crude oil−water interfacial film

Cited by 32 publications

References 41 publications

Modeling of the Phase Inversion Point of Crude Oil Emulsion by Characterization of Crude Oil Physical Properties

Modeling of the Phase Inversion Point of Crude Oil Emulsion by Characterization of Crude Oil Physical Properties

Effect of a Coated Wall on Wax–Asphaltene Molecule Diffusion, Aggregation, and Adhesion Mechanism: A Molecular Dynamics Simulation Study

Preparation and performance study of functional polymer with self demulsifying

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