Study on Wax Deposition Process of Crude Oil System under Shear Flow Field Conditions
Abstract
:1. Introduction
2. Experimental Methods
3. Results and Discussions
3.1. The Feature of Wax Deposition
3.2. Effect of Different Shear Rates on Wax Deposition in Crude Oil Systems
3.3. Effect of Different Wax Content on Deposition
4. Conclusions
- (1)
- Three-layer adsorption was used to deposit wax on the Fe surface, and the vdW interaction was the primary force behind this process. The Fe surface was subjected to strong vdW interaction by the first deposition layer and weak vdW interaction by the second deposition layer. Between deposited and un-deposited molecules, the second and third layers provided a transition zone where the relative concentration of wax was higher than that in the free system but lower than that in the first deposition layer.
- (2)
- Four steps can be distinguished in the process of crude oil depositing on the surface of Fe when shear flow conditions are met. The molecules migrated onto the Fe surface during the first step of diffusion. During the second stage, two forms of deposition were formed when wax molecules were adsorbed onto a solid surface in parallel caused by Brownian motion. During the third and fourth phases, bridging effects and intermolecular interactions caused flocculants to form between the crude oil system and the deposited layer. The shearing motion causes the second and third deposition layers to gradually peel off and slip.
- (3)
- Under varying shear rates and wax contents, the process of crude oil systems’ wax deposition was comparable, and the thickness of different layers was constant. The vdW interaction was the primary force on deposition.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Liu, H.; Yang, C.; Qi, J.; Liu, C.; Luo, H.; Li, B. Study on Wax Deposition Process of Crude Oil System under Shear Flow Field Conditions. Processes 2024, 12, 1774. https://doi.org/10.3390/pr12081774
Liu H, Yang C, Qi J, Liu C, Luo H, Li B. Study on Wax Deposition Process of Crude Oil System under Shear Flow Field Conditions. Processes. 2024; 12(8):1774. https://doi.org/10.3390/pr12081774
Chicago/Turabian StyleLiu, Haibo, Chao Yang, Jingjing Qi, Chao Liu, Haijun Luo, and Bingfan Li. 2024. "Study on Wax Deposition Process of Crude Oil System under Shear Flow Field Conditions" Processes 12, no. 8: 1774. https://doi.org/10.3390/pr12081774