Dehydration of Aging Oil by an Electrochemical Method

Wang, Zhihua; Le, Xinpeng; Feng, Yaoguo; Hu, Zhiwei

doi:10.1007/s10553-014-0520-6

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…Due to the various differences of interfacial properties and shearing action, the various models and results experienced in Newtonian fluids are not suitable to be applied to oilfield emulsion analysis directly. As a result, more efforts have been put on the research of emulsion stability and demulsification in recent years [34][35][36][37]. Most of the studies were mainly focused on the experimental work of emulsion properties and the development of correlation model, and whether their results were suitable for unsteady shearing fields was seldom mentioned.…”

Section: Mechanistic Modelmentioning

confidence: 99%

The Role of Shearing Energy and Interfacial Gibbs Free Energy in the Emulsification Mechanism of Waxy Crude Oil

Wang

Lin

Rui³

et al. 2017

Energies

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Abstract:Crude oil is generally produced with water, and the water cut produced by oil wells is increasingly common over their lifetime, so it is inevitable to create emulsions during oil production. However, the formation of emulsions presents a costly problem in surface process particularly, both in terms of transportation energy consumption and separation efficiency. To deal with the production and operational problems which are related to crude oil emulsions, especially to ensure the separation and transportation of crude oil-water systems, it is necessary to better understand the emulsification mechanism of crude oil under different conditions from the aspects of bulk and interfacial properties. The concept of shearing energy was introduced in this study to reveal the driving force for emulsification. The relationship between shearing stress in the flow field and interfacial tension (IFT) was established, and the correlation between shearing energy and interfacial Gibbs free energy was developed. The potential of the developed correlation model was validated using the experimental and field data on emulsification behavior. It was also shown how droplet deformation could be predicted from a random deformation degree and orientation angle. The results indicated that shearing energy as the energy produced by shearing stress working in the flow field is the driving force activating the emulsification behavior. The deformation degree and orientation angle of dispersed phase droplet are associated with the interfacial properties, rheological properties and the experienced turbulence degree. The correlation between shearing stress and IFT can be quantified if droplet deformation degree vs. droplet orientation angle data is available. When the water cut is close to the inversion point of waxy crude oil emulsion, the interfacial Gibbs free energy change decreased and the shearing energy increased. This feature is also presented in the special regions where the suddenly changed flow field can be formed. Hence, the shearing energy is an effective form that can show the contribution of kinetic energy for the oil-water mixtures to interfacial Gibbs free energy in emulsification process, and the emulsification mechanism of waxy crude oil-water emulsions was further explained from the theoretical level.

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Section: Mechanistic Modelmentioning

confidence: 99%

The Role of Shearing Energy and Interfacial Gibbs Free Energy in the Emulsification Mechanism of Waxy Crude Oil

Wang

Lin

Rui³

et al. 2017

Energies

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“…Heavy oil is a kind of unconventional crude oil with large reserves and high exploitation difficulty, which is widely distributed in the United States, Canada, Venezuela, China, and many other countries. − On the one hand, heavy oil has high viscosity, high density, high contents of gum and asphaltene, and rigid thick film with better compactness than conventional crude oil emulsion. − The interpolymerization behavior of water droplets at the oil–water interface is hindered, which makes the emulsion very stable and difficult to demulsify and dehydrate . On the other hand, the developed heavy oil is fully stirred with water through the strong shear action of the pipeline to form a complex and stable emulsion. , At present, the commonly used methods of demulsification and water removal mainly include physical method, chemical method, and biological method. − The chemical demulsification method is widely used in oil field demulsification because of its convenience and efficiency. It is the most common and most studied demulsification technology at present. − Sun et al prepared a novel polyether-polyquaternium (PPA) demulsifier for demulsifying the O/W emulsion that originates from wastewater produced from alkaline–surfactant–polymer (ASP) flooding.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Study of a New Type of Fluorinated Polyether Demulsifier for Heavy Oil Emulsion Demulsification

et al. 2021

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To solve the problem of heavy oil demulsification difficulties in Liaohe Oilfield, phenolamine resin initiator was synthesized from p-trifluoromethyl phenol, and then FB series fluorinated polyether demulsifiers were synthesized by block polymerization using ethylene oxide (EO) and propylene oxide (PO) as raw materials. The demulsifiers were characterized by infrared spectroscopy, cloud point, hydrophilic–lipophilic balance (HLB) value, and surface tension. The demulsifying and dehydrating properties were tested by demulsifying and dehydrating experiments, the demulsification mechanism was analyzed by the microscopic demulsification process test, and the influence of demulsifier addition and demulsifying temperature on demulsifying performance was also studied. The results showed that under the condition of the optimum demulsification temperature of 60 °C and the optimum demulsifier dosage of 100 mg/L, the water removal (%) of fluorinated polyether demulsifier of FB 4 was the highest, and the overall water removal (%) of 50 mL crude oil emulsion in Liaohe Oilfield reached 90.33% within 2 h, which was better than the current demulsifier used in Liaohe crude oil.

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“…With the development of oilfield entering high water cut stage and application of enhanced oil recovery technologies, more and more aging oil are produced during crude oil production and treatment process [1,2]. The aging oil is characterized by strengthened emulsification and thick oil-water interfacial film, which is challenge for aging oil dehydration.…”

Section: Introductionmentioning

confidence: 99%

Case Study on Pulse DC Electric Field for Weakening Interfacial Film of Aging Oil

Sun¹,

Liu²,

Zhang³

et al. 2016

Proceedings of the 4th 2016 International Conference on Material Science and Engineering (ICMSE 2016)

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Abstract. Coalescence effect of the surface disposal devices is greatly impacted by the large amount of aging oil because of its complicated interfacial properties, which heavily affects oil production. The typical aging oil properties are evaluated, interfacial properties and the causes of formation are discussed in the paper. It is not efficient enough for aging oil to be disposed only with the methods of the chemical or electric-field, even though the later one has many advantages in breaking oil-water interfacial film. The water content in oil, oil content in water and the oil-water interface properties after separated can meet the industrial standard by the integration disposal of the two methods. But the pulse DC power supply must be selected in the electric-field formation so that the instantaneous high power electric pulse can be created without electrodispersion, which can easily break the oil-water interfacial film and prevent current leakage. Besides, the aging oil disposal process is designed and the operating parameters are also optimized in the paper.

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Dehydration of Aging Oil by an Electrochemical Method

Cited by 7 publications

References 3 publications

The Role of Shearing Energy and Interfacial Gibbs Free Energy in the Emulsification Mechanism of Waxy Crude Oil

The Role of Shearing Energy and Interfacial Gibbs Free Energy in the Emulsification Mechanism of Waxy Crude Oil

Synthesis and Study of a New Type of Fluorinated Polyether Demulsifier for Heavy Oil Emulsion Demulsification

Case Study on Pulse DC Electric Field for Weakening Interfacial Film of Aging Oil

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