Formation of Methane Hydrate in Oil–Water Emulsion Governed by the Hydrophilic and Hydrophobic Properties of Non-Ionic Surfactants

Liu, Zaixing; Song, Yongchen; Liu, Weiguo; Chen, Lang; Zhao, Jiafei; Li, Yanghui

doi:10.1021/acs.energyfuels.9b01046

Cited by 30 publications

(16 citation statements)

References 42 publications

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“…Therefore, hydrate film growth is significantly affected by heat transfer at the gas−water interface. 112,113 Considering the complex composition of crude oil and various additives in real pipelines, Liu et al 114 studied the effect of the hydrophilicity and hydrophobicity of the additives on hydrate formation in the oil and water emulsion. When the hydrophilic lipophilic balance (HLB) value of the surfactant ranged between 8 and 10, the hydrate growth process was promoted in the phase transition region due to a smaller interfacial tension between the water and the oil.…”

Section: Ngh Phase Equilibria and Kinetics Research In Chinamentioning

confidence: 99%

Status of Natural Gas Hydrate Flow Assurance Research in China: A Review

Shi¹,

Song²,

Duan³

et al. 2021

Energy Fuels

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Natural gas hydrates (NGH) are prone to causing pipeline blockage in flow assurance, attracting considerable attention in the petroleum industry. This work reviews the significant progress in hydrate flow assurance research in China. Gas hydrate structures are briefly introduced to provide a basic understanding, while the application and development of hydrate management strategies in China are summarized. Subsequently, the development and improvement of hydrate phase equilibrium models are presented, which have been widely applied to the practical challenges of flow assurance. Moreover, kinetics research involving hydrate nucleation, growth, and decomposition are summarized, including nucleation mechanisms, induction time, memory effect, hydrate growth at different interfaces, hydrate growth at a microscopic level, and hydrate decomposition under different systems. The current research status of hydrate slurry flow is also analyzed in detail, covering the viscosity and flow resistance of hydrate slurry and the mechanisms of hydrate particle aggregation, deposition, and blockage. In addition, even though the numerical models of hydrate slurry multiphase flow have been sorted out, the accurate quantitative calculations and risk assessments are still in the initial stage, presenting significant room for improvement. Although substantial research progress has been made in China regarding gas hydrate flow assurance, considerable effort should be devoted to further understanding the intrinsic mechanism work to improve the applicability of various models. This review discusses the current developments, existing problems, and future prospects in the various basic hydrate flow assurance fields in China. It aims to provide readers with an overview of hydrate flow assurance research in China, hoping to provide a reference for developing this field.

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Section: Ngh Phase Equilibria and Kinetics Research In Chinamentioning

confidence: 99%

Status of Natural Gas Hydrate Flow Assurance Research in China: A Review

Shi¹,

Song²,

Duan³

et al. 2021

Energy Fuels

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“…Stirring promotes the mixing of incompatible gas and liquid, and it rapidly renews the reaction interface, thereby enhancing the transfer of heat and mass. Continuous stirring simultaneously increases material diffusion, accelerates material dissolution in the liquid phase, shortens the induction period, and increases the rate of hydrate formation [41,42]. Golombok et al [43] suggested that hydrate formation is limited by insufficient gas-liquid mixing.…”

Section: Characteristics Of Hydrate Formationmentioning

confidence: 99%

Hydrates for Cold Storage: Formation Characteristics, Stability, and Promoters

Chen¹,

Han

Chen

et al. 2021

Applied Sciences

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The potential of hydrates formed from R141b (CH3CCl2F), trimethylolethane (TME), and tetra-n-butylammonium bromide/tetra-n-butylammonium chloride (TBAB/TBAC) to be used as working substances for cold storage was investigated to provide a solution for unbalanced energy grids. In this study, the characteristics of hydrate formation, crystal morphology of hydrates, and the stability of hydrate in cyclic formation under 0.1 MPa and at 5 °C were carried out. It found that the ice had a positive effect on the hydrate formation under same conditions. Upon the addition of the ice cube, the induction time of R141b, TME, and TBAB/TBAC hydrates decreased markedly, and significantly high formation rates were obtained. Under magnetic stirring, the rate at which TBAB/TBAC formed hydrates was significantly lower than that when ice was used. In microscopic experiments, it was observed that the TBAB/TBAC mixture formed hydrates with more nucleation sites and compact structures, which may increase the hydrate formation rate. In the multiple cycle formation of TBAB/TBAC hydrates, the induction time gradually decreased with the increasing number of formation cycles and finally stabilized, which indicated the potential of the TBAB/TBAC hydrates for application in cold storage owing to their good durability and short process time for heat absorption and release.

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“…The rheological of properties of the hydrate slurry were rarely mentioned. The appearance of hydrate may make the slurry difficult to flow and may cause unpredictable pipeline blockage. , The rheological property of a hydrate slurry are critical to evaluate the flow performance of the hydrate slurry and the risk of blockage in hydrate solid fluidization and the pipeline transportation process. , …”

Section: Introductionmentioning

confidence: 99%

Rheological Properties of Hydrate Slurry Formed from Mudflows in South China Sea

Liu

Zhang

et al. 2021

Energy Fuels

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Solid fluidization is a current promising method to explore hydrate resources. The rheological properties of hydrate slurry are significant to solid fluidization and prevent hydrate blockage during pipeline transportation. To determine the impact of hydrate on the rheological properties of mudflow, a rheological experiment was conducted on methane hydrate slurry formed from a mudflow, which was prepared with marine sediment sampled from South China Sea. It was found that both mudflow and hydrate slurry exhibited viscoelastic fluid properties. The existence of hydrate substantially increased the apparent viscosity of the mudflow, and when the hydrate formed at a rapid rate, the apparent viscosity rose rapidly. With different initial pressures, the amount of hydrate formed in mudflow was different. A larger water conversion rate would increase the viscosity of the hydrate slurry significantly. Meanwhile, a yield stress measurement was conducted by stress sweep after hydrate formation. When the water conversion fractions were 17.8%, 20.3%, and 21.2%, the yield stresses of the hydrate slurry were 57.8, 465.2, and over 10,000 Pa, respectively. In addition, a frequency test sweep was conducted, and the results showed that the existence of hydrate would significantly increase the elasticity of the slurry.

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Formation of Methane Hydrate in Oil–Water Emulsion Governed by the Hydrophilic and Hydrophobic Properties of Non-Ionic Surfactants

Cited by 30 publications

References 42 publications

Status of Natural Gas Hydrate Flow Assurance Research in China: A Review

Status of Natural Gas Hydrate Flow Assurance Research in China: A Review

Hydrates for Cold Storage: Formation Characteristics, Stability, and Promoters

Rheological Properties of Hydrate Slurry Formed from Mudflows in South China Sea

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