Reducing viscosity of waxy crude oil with electric field perpendicular to oil’s flow direction

Huang, Qian; Li, Hongying; Zhuang, Yu; Ding, Yifei; Ma, Chenbo; Chen, Chaohui; Xie, Yiwei; Liang, Huaqing; Han, Shanpeng; Zhang, Jinjun

doi:10.1016/j.fuel.2020.119345

Cited by 33 publications

(5 citation statements)

References 25 publications

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“…Electric field modification is the application of a high voltage electric field of a certain intensity (intensity 0.2–5 kV/mm) to waxy crude oil for a certain period of time (several seconds) to reduce the pour point of the crude oil and the strength of the gelling structure formed at low temperatures. It has been reported that for some waxy crude oils, the viscosity near the pour point can be reduced by more than 80% and the yield stress reduction rate can be up to 90%, while the energy consumption is only 1% of the heating energy consumption for the same viscosity reduction rate. − …”

Section: Strategies For Improving the Flowability Of Waxy Oilsmentioning

confidence: 99%

Advances in and Perspectives on Strategies for Improving the Flowability of Waxy Oils

Yao

Sun

et al. 2022

Energy Fuels

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The research on the flowability of waxy oil has spanned more than a century and is still attracting much attention. How to improve the flowability of waxy oil to ensure safe and efficient pipeline transportation and storage is of great practical importance for the industry. In this work, we have systematically reviewed the research advances in improving the flowability of waxy oil. First, the crystallization properties and phase behavior of waxes are described based on their chemical structure, thermodynamic properties, and solution phase properties, with emphasis on the solventized layer properties of wax crystals. Then, the mechanisms, process, and research progress in flow improvement of waxy oil are discussed from three major aspects: process improvement, equipment improvement, and chemical treatment, with emphasis on the summary of waxy oil pour point depressants in recent years. The remaining challenges and perspectives for future research on flow improvement of waxy oil are presented.

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Section: Strategies For Improving the Flowability Of Waxy Oilsmentioning

confidence: 99%

Advances in and Perspectives on Strategies for Improving the Flowability of Waxy Oils

Yao

Sun

et al. 2022

Energy Fuels

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“…Currently, physical and chemical methods are used to alleviate the problem of wax deposition. Physical methods include pipeline preheating, − heated transport, , applying coatings to the inner wall of the pipeline, − dilution treatment, pipe cleaning, − application of electric field, − magnetic field, − etc. Pipeline preheating and heat delivery require additional heating stations, which increase energy and economic costs.…”

Section: Introductionmentioning

confidence: 99%

Research Status and Outlook of Mechanism, Characterization, Performance Evaluation, and Type of Pour Point Depressants in Waxy Crude Oil: A Review

Li,

Guo,

et al. 2024

Energy Fuels

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With the depletion of conventional oil resources, waxy crude oil has become a focus of development. Wax deposition is prone to occur in crude oil at low temperatures, and can easily cause pipeline blockage. Hence, preventing wax deposition while ensuring the safety of pipeline transportation and reducing energy consumption has become a popular research topic. Pour point depressants are normally used to solve the wax deposition problem. In this paper, recent research on pour point depressants is reviewed and the mechanism by which pour point depressants inhibit wax deposition is clarified. Commonly used characterization methods and performance evaluations in the research of pour point depressants are summarized. According to the composition of pour point depressants, the chemical structures and effects of polymers, surfactants, green pour point depressants, and nanohybridized pour point depressants are analyzed. Among these four, nanohybridized pour point depressants have better application prospects due to their unique size, excellent heat resistance, stability, and exceptional optical, electrical, and magnetic properties, which can effectively improve the inhibition performance of pure polymers or surfactants. Finally, future challenges in pour point depressants are analyzed.

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“…Tao et al , tested many crude oil samples under an electric field and found that the electric field is very effective in reducing their viscosities especially at low temperature with very little energy consumption. Ma et al, Huang et al, Chen et al, and Zhang et al studied the influence of electric field on the cold flowability of waxy crude oil. They thought that weakened interaction between wax particles due to electric field exposure should be the primary reason for viscosity reduction.…”

Section: Introductionmentioning

confidence: 99%

Electrorheological Characteristic of Heavy Oil Emulsions under High-Frequency/High-Voltage AC Electric Field

et al. 2023

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We experimentally explored the electrostatic demulsification performance of water-in-heavy oil emulsion under a high-frequency/high-voltage AC electric field by considering some factors such as the shearing rate, water content, temperature, electric field strength, pulsatile frequency, demulsifier types, and concentration. Relative viscosity reduction of heavy oil is used as the evaluation index for demulsification performance. The results indicated that the phase inversion point of the heavy oil emulsion is between 40 and 50%. The demulsification performance can be improved by increasing the shearing rate if it is within the limited range. The optimum shearing rate in this experiment is around 100 s–1 with the corresponding relative viscosity reduction of 64.7%. There exist optimum electric field strength (2 kV/cm) and frequency (2 kHz) for the electrostatic demulsification of heavy oil emulsion with water content 30% and temperature 60 °C. The relative viscosity reduction can be up to 67.5% under optimum electric field parameters (2 kV/cm, 2 kHz). Six different types of demulsifiers used in this experiment all contribute to reducing the viscosity of the heavy oil emulsion. Among them, the type C demulsifier shows the best viscosity reduction effect. The relative viscosity reduction could be up to 76.39% with the combination effect of high frequency/high voltage AC electric field. The viscosity reduction effect is proportional to the demulsifier concentration. These findings can help to optimize operating parameters for the crude oil dehydration devices to achieve best separation performance in heavy oil fields.

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Reducing viscosity of waxy crude oil with electric field perpendicular to oil’s flow direction

Cited by 33 publications

References 25 publications

Advances in and Perspectives on Strategies for Improving the Flowability of Waxy Oils

Advances in and Perspectives on Strategies for Improving the Flowability of Waxy Oils

Research Status and Outlook of Mechanism, Characterization, Performance Evaluation, and Type of Pour Point Depressants in Waxy Crude Oil: A Review

Electrorheological Characteristic of Heavy Oil Emulsions under High-Frequency/High-Voltage AC Electric Field

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