Reversibility of Asphaltene Deposition Under Dynamic Flow Conditions

Shedid, Shedid A.; Abbas, El Abbas A.

doi:10.1081/lft-200056820

Cited by 7 publications

(4 citation statements)

References 13 publications

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“…As was expected, the presence of aromatics in the gasoline content increased the solubility of solid deposits compared to the other two solvents. These findings are in good agreement with the results in the literature. − …”

Section: Resultssupporting

confidence: 92%

Comparative Static and Dynamic Analyses of Solvents for Removal of Asphaltene and Wax Deposits above- and below-Surface at an Iranian Carbonate Oil Field

et al. 2023

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During production from oil wells, the deposition of asphaltene and wax at surface facilities and porous media is one of the major operational challenges. The crude oil production rate is significantly reduced due to asphaltene deposition inside the reservoir. In addition, the deposition of these solids inside the surface facilities is costly to oil companies. In this study, the efficiency of different solvents in dissolving asphaltene and wax was investigated through static and dynamic tests. The analysis of solid deposits from the surface choke of one of the Iranian carbonate oil fields showed that they consisted of 41.3 wt % asphaltene, and the balance was predominantly wax. In addition, the asphaltenes obtained from the surface choke solid deposits had a more complex structure than that of asphaltenes extracted from the crude oil itself. The static tests showed that xylene, toluene, gasoline, kerosene, and gas condensate had the highest efficiencies in dissolving solid deposits; conversely, diesel had a negative impact on dissolving solid deposits. Static tests on pure asphaltene showed that, among the tested solvents, gas condensate and diesel had a negative effect on the solubility of asphaltene. The dynamic core flooding results showed that asphaltene deposition inside the cores reduced the permeability by 79−91%. Among the tested solvents, xylene, gasoline, and kerosene resulted in the highest efficacy in restoring the damaged permeability, and higher efficiency was obtained with an equivalent solvent injection rate of 1 bbl/min versus 3 bbl/min.

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Section: Resultssupporting

confidence: 92%

Comparative Static and Dynamic Analyses of Solvents for Removal of Asphaltene and Wax Deposits above- and below-Surface at an Iranian Carbonate Oil Field

et al. 2023

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“…Pore diameter has been investigated by several groups especially since it relates to catalyst fouling, ,, reservoir permeability, ,, and the inherent flux in size of asphaltene aggregates. Some researchers have claimed that adsorption is primarily governed by pore diameter and pore volume and is not dependent on surface area .…”

Section: Asphaltene Adsorption Considerations and Physical Aspects Of...mentioning

confidence: 99%

“…124 In one special case, it was reported for the clay mineral illite that adsorption increased with decreasing particle size, as expected, on a mg/g basis, but when compared to the surface area, mg/ m 2 , the adsorption capacity was greatest for medium-sized particles, which may be related to the type of faces exposed since adsorption is nonuniform and may only occur at specific edges of the crystal lattice. 101 Pore diameter has been investigated by several groups especially since it relates to catalyst fouling, 15,16,125 reservoir permeability, 6,126,127 and the inherent flux in size of asphaltene aggregates. Some researchers have claimed that adsorption is primarily governed by pore diameter and pore volume and is not dependent on surface area.…”

Section: Asphaltene Adsorption Considerationsmentioning

confidence: 99%

Asphaltene Adsorption, a Literature Review

2014

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Asphaltene adsorption at solid surfaces is a ubiquitous phenomenon that begins within the production well and continues through the entire production chain. It is generally an undesirable phenomenon that causes damage within reservoirs, fouling of pipelines and transportation equipment, and fouling of refining and upgrading equipment. However, by virtue of this phenomenon, problematic asphaltenes may also be selectively removed from petroleum streams to produce partially upgraded petroleum, which has significantly improved handling, processing, and upgrading qualities. This review covers many basic aspects regarding the chemical and physical nature of asphaltenes and sorbents related to asphaltene adsorption.

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“…The precipitated asphaltenes then start to agglomerate and eventually will clog the pores and deposit in wellbores and surface facilities . To prevent and remediate asphaltene precipitation issues, several methods are proposed: (1) thermodynamic control by maintaining the system pressure and temperature to keep asphaltenes stable; (2) kinetic control with the addition of inhibitors, hydrophobic deep eutectic solvents, dispersants, and nanofluids; − (3) mechanical control by removing asphaltenes after deposition with ultrasonic technique; and (4) cleaning with solvents. , Only a few authors have studied the deposition of asphaltenes on metal surfaces, − but adsorption of asphaltenes on nonmetallic surfaces such as minerals has been investigated by many authors because asphaltenes may alter wettability and cause formation damage. − Van der Waals attraction (nonpolar) between the surface and functional groups of asphaltenes is the main force that causes the adhesion of asphaltene to surfaces . However, the polar attraction can play an important role in some systems .…”

Section: Introductionmentioning

confidence: 99%

Investigation of Asphaltene Polydispersity, Stability, and Deposition on Steel Using XDLVO Theory

Nguyen¹,

Cao²,

Pohl³

et al. 2023

Energy Fuels

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The characterization and analysis of asphaltene particles are very crucial in the petroleum industry as the precipitation and subsequent deposition of asphaltenes cause formation damage and clogging of wellbore and production equipment, leading to production decline and operational drawbacks. In this study, the polydispersity of asphaltenes and the interaction between asphaltenes were probed by using the surface energy concept. Asphaltenes from three different oil fields in the Gulf of Mexico (GOM) were selected for this study. The results revealed that asphaltenes destabilized by different precipitants in the lab or from different assets in the field have distinctive surface energy values. Dispersive force was the dominant force of asphaltenes in oil systems. However, increasing polar forces appeared to increase the attractive interaction between asphaltenes which can in turn lead to higher aggregation and precipitation tendency. The magnitude of polar force is proportional to the content of heteroatoms and has a higher value for asphaltenes that were destabilized and then deposited by smaller alkanes. The stability of asphaltenes in oil from various fields and their deposition on steel were also investigated using the extended Derjaguin–Landau–Verwey–Overbeek (XDLVO) theory. The results showed that van der Waals and acid–base interactions, among other components of the surface energy, were dominant in promoting asphaltene aggregation and deposition by increasing the attractive force between similar asphaltenes and asphaltene-steel, respectively. These findings were further supported by the concept of works of cohesion and adhesion. The results showed that asphaltenes were unstable and had the tendency to deposit on the steel substrate. The total interaction energy between asphaltene and steel, obtained from the XDLVO theory, and the work of adhesion correlated well with the amounts of asphaltene deposition generated by experimental lab setups. Interfacial tension between asphaltene and steel can provide information about the bond stability and deposit persistence under shear.

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Reversibility of Asphaltene Deposition Under Dynamic Flow Conditions

Cited by 7 publications

References 13 publications

Comparative Static and Dynamic Analyses of Solvents for Removal of Asphaltene and Wax Deposits above- and below-Surface at an Iranian Carbonate Oil Field

Comparative Static and Dynamic Analyses of Solvents for Removal of Asphaltene and Wax Deposits above- and below-Surface at an Iranian Carbonate Oil Field

Asphaltene Adsorption, a Literature Review

Investigation of Asphaltene Polydispersity, Stability, and Deposition on Steel Using XDLVO Theory

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