Nonlinear relationship between heavy oil viscosity and asphaltene dispersion: A molecular dynamics simulation study

Zhang, Jun; Zhu, Bojin; Yuan, Haoqiang; Peng, Hui; Zhong, Jie; Yan, Youguo; Li, Zhen

doi:10.1016/j.ces.2024.120173

Chemical Engineering Science

2024

DOI: 10.1016/j.ces.2024.120173

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Nonlinear relationship between heavy oil viscosity and asphaltene dispersion: A molecular dynamics simulation study

Jun Zhang,

Bojin Zhu,

Haoqiang Yuan

et al.

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Cited by 3 publications

References 52 publications

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Different mechanisms of two oil-soluble additives to reduce heavy crude oil viscosity

Li,

Zhu,

Han

et al. 2024

Journal of Molecular Liquids

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Different mechanisms of two oil-soluble additives to reduce heavy crude oil viscosity

Li,

Zhu,

Han

et al. 2024

Journal of Molecular Liquids

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Sacrificing Surfactants to Improve Oil Recovery: A Fluid Density Functional Theory Study

Xu,

Cheng,

et al. 2024

Langmuir

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In the chemically enhanced oil recovery (CEOR) processes, heavy components in crude oil, such as asphaltenes, adhere to reservoir rocks, significantly impeding crude oil extraction. Surfactants are frequently utilized to improve oil recovery due to their ability to reduce interfacial tension (IFT) and modify surface wettability. Nevertheless, indiscriminate surfactant usage may result in resource wastage and hinder the attainment of optimal recovery outcomes. Therefore, it is urgent to accurately and efficiently screen out optimal surfactants suitable for different oil fields. This work employs fluid density functional theory (FDFT) to investigate the competitive adsorption mechanism of surfactants and asphaltenes on rock interfaces. We examined the impact of surfactants on asphaltene adsorption and determined the optimal surfactant concentration and chain length for differing reservoir electrical properties and asphaltene compositions. Furthermore, a comprehensive assessment of surfactants was conducted, considering both performance and economic factors. The findings contribute to a deeper comprehension of the displacement effect of surfactants on asphaltenes and offer scientific screening solutions for surfactants in oil recovery processes.

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Characteristics and Genesis of Heavy Oil in Shallow and Thin Layers in Chepaizi Area, Xinjiang, China

Tao,

Hu,

Wang

et al. 2024

Energies

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The Neoproterozoic Shawan Formation in the Chepaizi area is recognized for its significant heavy oil resources. Investigating the underlying causes and mechanisms of heavy oil changes in accordance with the specific characteristics of the reservoir is crucial for future exploration and development. The distribution of heavy oil in the Pai 612 block was identified to present a combination of shallow and thin deposits, high porosity, high permeability, and elevated water content. The physicochemical properties of the crude oil included a complex composition, high density, high viscosity, substantial gel content, and notable oxidation-biodegradation potential. The oxidation and biodegradation of crude oil during transportation played the critical roles in the formation of heavy oil. As cru3de oil was transported upward, the formation temperature decreased, resulting in increased viscosity. An excess of water could initially increase and subsequently decrease heavy oil viscosity, while groundwater in the reservoir contained various chemicals that interacted with colloids and asphaltenes, further increasing the viscosity. During the formation of the early heavy oil reservoir, the light oil was unable to dissolve and transport the high-molecular-weight asphaltene component, leading to the high resin content in the heavy oil of the Pai 612 block.

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Nonlinear relationship between heavy oil viscosity and asphaltene dispersion: A molecular dynamics simulation study

Cited by 3 publications

References 52 publications

Different mechanisms of two oil-soluble additives to reduce heavy crude oil viscosity

Different mechanisms of two oil-soluble additives to reduce heavy crude oil viscosity

Sacrificing Surfactants to Improve Oil Recovery: A Fluid Density Functional Theory Study

Characteristics and Genesis of Heavy Oil in Shallow and Thin Layers in Chepaizi Area, Xinjiang, China

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