Formation and agglomeration of gas hydrates in gas – organic liquid – water systems in a stirred reactor: Role of resins/asphaltenes/surfactants

Stoporev, Andrey S.; Semenov, Anton P.; Medvedev, V. I.; Mendgaziev, Rais I.; Истомин, В. А.; Sergeeva, D; Manakov, Andrey Yu.; Винокуров, В. А.

doi:10.1016/j.petrol.2019.02.002

Cited by 46 publications

(15 citation statements)

References 37 publications

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“…For example, the authors observed an increase in agglomeration and a decrease in supercooling with an increase in the asphaltene content in the system. This indicates the role of asphaltenes in hydrate nucleation and adhesion with hydrate crystals . Apart from hydrate inhibition in bulk, a promotion effect has also been observed at the interface due to increased methane diffusion through a gas–water interface .…”

Section: Introductionmentioning

confidence: 90%

“…This indicates the role of asphaltenes in hydrate nucleation and adhesion with hydrate crystals. 42 Apart from hydrate inhibition in bulk, a promotion effect has also been observed at the interface due to increased methane diffusion through a gas−water interface. 38 Some studies have observed that a decrease in solubility of the heavier fraction in the oil could promote the hydrate plugging tendency.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Asphaltenes on the Kinetics of Methane Hydrate Formation and Dissociation in Oil-in-Water Dispersion Systems Containing Light Saturated and Aromatic Hydrocarbons

2021

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Proper understanding of the interaction of individual components of crude oil with hydrate formation and dissociation is essential to design an effective mitigation strategy for hydrate blockage, especially in offshore flowlines. In this study, various isothermal methane hydrate formation and dissociation kinetics experiments have been carried out in oil-in-water dispersion systems to understand the effect of liquid hydrocarbons (such as n-heptane and toluene) and asphaltenes with varying concentrations at 8 MPa and 275.15 K. To correlate the results obtained from the kinetics experiments, solubility tests and interfacial tension measurements have also been carried out. It was observed that aromatic hydrocarbons (e.g., toluene) in the system led to less dissolution of methane gas as compared to alkanes (e.g., n-heptane). This, along with the more developed oil− water interface due to the lower density difference with water, made the system more vulnerable to hydrate formation, and it displayed secondary hydrate induction. The presence of asphaltenes in the oil−water system showed higher gas consumption during hydrate formation at lower concentrations, possibly due to flocculated asphaltene molecules at the oil−water interface acting as nucleation sites for hydrate formation. As the concentration of asphaltene increases, the growth of hydrate crystals is found to be limited, as more asphaltene molecules tend to restrict the gas diffusion toward the water phase, controlling the growth kinetics during hydrate formation. The hydrate dissociation experiments suggest that the presence of flocculated asphaltenes in the system has delayed the dissociation of methane hydrate crystals for some time. The findings of this study will help gain an insight into the interaction of asphaltene, alkanes, and aromatics on the kinetics of methane hydrate formation and dissociation suitable for flow assurance applications.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Effect of Asphaltenes on the Kinetics of Methane Hydrate Formation and Dissociation in Oil-in-Water Dispersion Systems Containing Light Saturated and Aromatic Hydrocarbons

2021

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“…In some systems, a nonmonotonic increase in the amount of hydrates formed was observed with a decrease of the asphaltene–resin content. By observing the increase in torque in the reaction system, Stoporev proposed that the association of resins and asphaltenes promotes the nucleation of hydrates with the two structures in the water-in-oil emulsion. The most feasible reason is that the change of pressure and temperature conditions in the liquid phase may cause asphaltene flocculation, providing nucleation sites for the formation of natural gas hydrates, further augmenting the possibility of hydrate blockage. , Zhao reported that natural surfactants such as asphaltenes in crude oil would compete with hydrate antiagglomerants for adsorption sites on the hydrate surface, resulting in the effect of hydrate antiagglomeration being greatly weakened.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Hydrate Formation and Growth Characteristics in Dissolved Asphaltene-Containing Water-In-Oil Emulsion

Ning

Song

et al. 2021

Langmuir

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Clarifying the effect of asphaltene on hydrate formation and growth is of great significance to the operation safety in deepwater petroleum fields. To investigate the influence of low-concentration dissolved asphaltenes on the formation kinetics and growth process of hydrates in water-in-oil emulsions, experiments with asphaltene concentrations ranging from 50 to 1000 ppm were carried out using a high-pressure visual reactor. At a low concentration, the adsorption of asphaltene monomers on the oil−water interface or nanoaggregates in the bulk barely affected the nucleation of hydrate and the induction time of hydrate formation. However, it would hinder the microscopic mass transfer process and heat transfer process between gas molecules and then mitigate the initial rate of hydrate formation. Therefore, the dissolved asphaltenes could not be used as antiagglomerants (AAs) to efficiently inhibit the aggregation of hydrate particles at low concentrations under our experimental conditions, causing extensive hydrate agglomeration and deposition in the reactor.

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“…Gas hydrate, a type of cage-like crystal structure constructed by water and gas molecules, is generally formed in a low-temperature and high-pressure environment. − The gas molecules, such as methane, ethane, carbon dioxide, and so forth, − are able to be enveloped by the cages of water molecules, forming structure I, II, and H hydrate. − The formation of hydrate becomes a challenge in the development of deep-water fields, where the oil or gas is exposed to the environment of high pressure, low temperature, and water cuts. , Therefore, hydrate forms more easily in the deep water environment and increases the risk of plugging pipelines. − Webb et al studied the effect of water fraction in a water-in-dodecane emulsion on the rheological behavior of a hydrate slurry via a high-pressure rheology apparatus. The results show that the viscosity of the hydrate slurry increases apparently with the increase of water fraction from 5 to 30%.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Ethylene Vinyl Acetate Copolymer on the Induction of Cyclopentane Hydrate in a Water-in-Waxy Oil Emulsion System

Peng¹,

Wang²,

Cheng³

et al. 2021

Langmuir

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In this paper, the effect of the ethylene vinyl acetate (EVA) copolymer, commonly used in improving rheological behavior of waxy oil, is introduced to investigate its effect on the formation of cyclopentane hydrate in a water-in-waxy oil emulsion system. The wax content studied shows a negative effect on the formation of hydrate by elongating its induction time. Besides, the EVA copolymer is found to elongate the induction time of cyclopentane hydrate through the cocrystallization effect with wax molecules adjacent to the oil–water interface.

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Formation and agglomeration of gas hydrates in gas – organic liquid – water systems in a stirred reactor: Role of resins/asphaltenes/surfactants

Cited by 46 publications

References 37 publications

Effect of Asphaltenes on the Kinetics of Methane Hydrate Formation and Dissociation in Oil-in-Water Dispersion Systems Containing Light Saturated and Aromatic Hydrocarbons

Effect of Asphaltenes on the Kinetics of Methane Hydrate Formation and Dissociation in Oil-in-Water Dispersion Systems Containing Light Saturated and Aromatic Hydrocarbons

Investigation on Hydrate Formation and Growth Characteristics in Dissolved Asphaltene-Containing Water-In-Oil Emulsion

Effect of the Ethylene Vinyl Acetate Copolymer on the Induction of Cyclopentane Hydrate in a Water-in-Waxy Oil Emulsion System

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