Experimental and Theoretical Investigation of the Interaction between Hydrate Formation and Wax Precipitation in Water-in-Oil Emulsions

Chen, Shilin; Liu, Yang; Song, Shangfei

doi:10.1021/acs.energyfuels.8b01713

Cited by 60 publications

(57 citation statements)

References 64 publications

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“…They then established a viscosity model of wax hydrate slurry considering the phase interactions. Chen et al 9 carried out the hydrate formation experiments of waxy w/o systems in a high pressure reactor, and found that wax crystals had an inhibitory effect on hydrate nucleation. With the increase of wax content, the induction period of hydrate formation is prolonged.…”

Section: Introductionmentioning

confidence: 99%

Evolution of morphology and cohesive force of hydrate particles in the presence/absence of wax

Liu

et al. 2022

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Evolution of morphology and cohesive force of hydrate particles in the presence/absence of wax

Liu

et al. 2022

RSC Adv.

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“…Up to now, many studies have been conducted to investigate the interaction between hydrate and wax in terms of nucleation, − formation, − agglomeration, ,− deposition, , and plugging . The details and main conclusions of these studies have been discussed in our previous study and will not be repeated here.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Hydrate Growth at the Oil–Water Interface: In the Presence of Wax and Kinetic Hydrate Inhibitor

Song

Ning

et al. 2020

Langmuir

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In oil industry, the coexistence of hydrate and wax can result in a severe challenge to subsea flow assurance. In order to study the effects of wax on hydrate growth at the oil–water interface, a series of microexperiments were conducted in a self-made reactor, where hydrates gradually nucleated and grew on the surface of a water droplet immersed in wax-containing oil. According to the micro-observations, hydrate shells formed at the oil–water interface in the absence of kinetic hydrate inhibitor (KHI). The roughness and growth rate of hydrate shells were analyzed, and the effects of wax were investigated. In addition, vertical growth of the hydrate shell was observed in the presence of wax, and a mechanism was proposed for illustration. In the presence of KHI, small hydrate crystals formed separately at the oil–water interface instead of hydrate shells. The presence of KHI reduced the growth rate of hydrates and changed the wettability of hydrates. Moreover, the presence of wax showed no obvious effect on the effectiveness of KHI under experimental conditions.

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“…To date, different research has been performed to study the coupling between hydrate issues and wax issues. The results of this research haves shown that wax could affect hydrate issues through affecting the nucleation, − formation, − agglomeration, ,− deposition, , and plugging processes. However, the main conclusions and mechanisms obtained from this research can be quite different and sometimes contradictory with each other.…”

Section: Introductionmentioning

confidence: 84%

Investigation on Hydrate Growth at the Oil–Water Interface: In the Presence of Wax and Surfactant

et al. 2021

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Natural gas hydrates can readily form in deep-water–oil production processes and pose a great threat to subsea pipeline flow assurance. The usage of surfactants and hydrate antiagglomerants is a common strategy to prevent hydrate hazards. In water/wax-containing oil systems, hydrate coexisting with wax could lead to more complex and risky transportation conditions. Moreover, the effectiveness of surfactants and hydrate antiagglomerants in the presence of wax should be further evaluated. In this work, for the purpose of investigating how wax and surfactants could affect hydrate growth at the oil–water interface, a series of microexperiments was conducted in an atmospheric visual cell where the nucleation and growth of hydrates took place on a water droplet surrounded by wax-containing oils. On the basis of the experimental phenomena observed using a microscope, the formation of a hydrate shell by lateral growth, the collapse of a water droplet after hydrate initial formation, and the formation of hollow–conical hydrate crystals were identified. These experimental phenomena were closely related to the concentration of wax and surfactant used in each case. In addition, it was shown that the effectiveness of the surfactant could be weakened by wax molecules. Moreover, there existed a critical wax content above which the effectiveness of the surfactant was greatly reduced and the critical wax content gradually increased with increasing surfactant concentration. This work could provide guidance for hydrate management in wax-containing systems.

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Experimental and Theoretical Investigation of the Interaction between Hydrate Formation and Wax Precipitation in Water-in-Oil Emulsions

Cited by 60 publications

References 64 publications

Evolution of morphology and cohesive force of hydrate particles in the presence/absence of wax

Evolution of morphology and cohesive force of hydrate particles in the presence/absence of wax

Investigation on Hydrate Growth at the Oil–Water Interface: In the Presence of Wax and Kinetic Hydrate Inhibitor

Investigation on Hydrate Growth at the Oil–Water Interface: In the Presence of Wax and Surfactant

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