Asphaltene aggregation and deposition in pipeline: Insight from multiscale simulation

Zhang, Jun; Wei, Qi; Zhu, Bojin; Wang, Wendong; Li, Lei; Su, Yuliang; Wang, Peng; Yan, Youguo; Li, Jiawei; Li, Zhen

doi:10.1016/j.colsurfa.2022.129394

Cited by 11 publications

(4 citation statements)

References 43 publications

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“…As the methane and light fraction in the left reservoir were continuously extracted through the pore throat, some clusters grow up gradually. 60 When these clusters moved to the entrance of the pore throat, they were caught by those heavy fractions already adsorbed near the edge. Then, the pore entrance was almost blocked 67 and the migration process went into the second stage, as shown in Figure 2c.…”

Section: Resultsmentioning

confidence: 99%

“…The molecule number ratio of SARA is set to be 180:30:5:2, which approximates to the proportion of a Gulong shale oil sample . Considering the fact that asphaltene has a great impact on oil transport, − its proportion was increased appropriately. GOR is adopted to quantitatively describe the composition of shale gas/oil mixture.…”

Section: Molecular Model and Methodsmentioning

confidence: 99%

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Molecular Understanding on Migration and Recovery of Shale Gas/Oil Mixture through a Pore Throat

Hong

et al. 2022

Energy Fuels

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Shale gas/oil remaining in blind pores accounts for a large proportion in total reserves, which is urgent to be further exploited. Understanding the microscopic mechanism of gas/oil extraction from blind pores is critical to enhanced gas/oil recovery. In this study, we investigated the migration and recovery behavior of shale gas/oil mixture through a pore throat connecting blind pores and microfractures. Our simulations show that some oil molecules tend to migrate in the form of clusters, which increases their effective size and causes possible blockage of the pore throat. The recovery ratio of gas/ oil mixture has a strong dependence on the pore size. Below the critical size, which is smaller than the size of oil clusters, the pore throat would be blocked and the recovery ratio will decrease significantly. The heavy fractions of shale oil suppress the extraction of gas/oil molecules from blind pores by four inhibition mechanisms: edge adsorption, surface adsorption, throat blockage, and liquid bridge. The kerogen pore shows a stronger adsorption ability for gas/oil mixture than quartz pore, resulting in more residues in it. We also found that a higher gas/oil ratio can provide a larger driven force, leading to a higher recovery of methane and light fractions. These findings advance the understanding of the recovery mechanisms of remaining gas/oil in blind pores and provide a practical guideline on shale gas/oil exploitation.

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Section: Resultsmentioning

confidence: 99%

Section: Molecular Model and Methodsmentioning

confidence: 99%

Molecular Understanding on Migration and Recovery of Shale Gas/Oil Mixture through a Pore Throat

Hong

et al. 2022

Energy Fuels

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“…Asphaltene is one of the four components of crude oil, which is called asphaltene molecules because of its extremely complex molecular composition. − Asphaltene is usually classified as the most polar part of crude oil. Asphaltene has been identified as a molecule containing polycyclic and polycyclic compounds with short aliphatic chains and heteroatoms such as nitrogen, oxygen, and sulfur.…”

Section: Introductionmentioning

confidence: 99%

“…Han et al studied the relationship between aggregate properties and emulsion properties through experimental and simulation methods. Moncayo-Riascos et al and Zhang et al studied the aggregation behavior of asphaltene in pipelines. Recent studies focused on the aggregation behavior of asphaltenes in static fluids, − while Song studied the influence of shear force on asphalt aggregation behavior .…”

Section: Introductionmentioning

confidence: 99%

Mesoscopic Simulation of Aggregate Characteristics of Asphaltene Molecules Under Shear Fields

Wu,

2024

ACS Omega

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Behaviors of asphaltene molecules in toluene under a shear force field were investigated by dissipative particle dynamics (DPD). The results showed that asphaltene molecules aggregated into nanoaggregates (NAs) in three forms, mainly in the face-toface type, which contained up to 7 asphaltene molecules. In the aggregates, the distance between aromatic sheets (ASes) of adjacent asphaltene molecules was about 6 Å, and the minimum was 5.49 Å. The composition of NAs changed dynamically. In the absence of shear, the aggregates lasted for more than 3000 ps and up to 8000 ps. The asphaltene molecules in an aggregate might reaggregate once dispersed. Both the number and size of the aggregates decreased under the shear force field, and the duration decreased to less than 1000 ps. The direction of the ASes was distributed randomly when the shear rate was zero. Once sheared, the angle between the ASes and the shear force field plane decreased while the range of it expanded. The ASes tended to be parallel to the shear field and the angle between the two concentrated below 40°. As the shear rate increased, the angle decreased and the distribution was more concentrated.

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A coupled DEM-CFD analysis of asphaltene particles agglomeration in turbulent pipe flow

Hosseini,

Mozaffarian,

Dabir

et al. 2024

Chemical Engineering Journal

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Asphaltene aggregation and deposition in pipeline: Insight from multiscale simulation

Cited by 11 publications

References 43 publications

Molecular Understanding on Migration and Recovery of Shale Gas/Oil Mixture through a Pore Throat

Molecular Understanding on Migration and Recovery of Shale Gas/Oil Mixture through a Pore Throat

Mesoscopic Simulation of Aggregate Characteristics of Asphaltene Molecules Under Shear Fields

A coupled DEM-CFD analysis of asphaltene particles agglomeration in turbulent pipe flow

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