The effect of aqueous NaCl solution on methane hydrate nucleation and growth

Bai, Dongsheng; Wu, Ziyan; Lin, Cijie; Zhou, Di

doi:10.1016/j.fluid.2019.01.008

Cited by 53 publications

(35 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Overall, for the 1:6 methane-towater ratio, it is observed that the salt ions present in saline water inhibit methane hydrate formation and growth kinetics at an operating temperature and pressure of 260 K and 50 MPa, respectively. However, it is speculated 33 that the presence of salt ions in water at lower methane concentration can play a positive role toward the formation and growth of methane hydrates. It is with this intention we further evaluate the nature of methane hydrate dynamics at lower methane concentrations in the presence of salt ions.…”

Section: Methane Hydrate Dynamics In Saltmentioning

confidence: 99%

“…Thus, the occupancy of methane is reduced with methane hydrate growth in the presence of aqueous NaCl solution. Recently, Bai et al 33 have recognized (i) an inhibition effect of salt ions on methane hydrate dynamics and (ii) a dual influence of the salt ions on the mass transfer of methane molecules during the hydrate growth, which is attributed to the change in the apparent concentration of methane.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Microscopic Molecular Insights into Hydrate Formation and Growth in Pure and Saline Water Environments

et al. 2020

View full text Add to dashboard Cite

The growth dynamics of natural gas hydrates in saline water has been studied using copious experiments and spectroscopic observations; however, the microscopic evidences to the structural and molecular transformations that they have provided are poorly understood. In this view, we perform extensive molecular dynamics simulations to gain physical insights into the formation and growth mechanism of naturally occurring gas hydrates with a wide variation in the amount of methane (1:5 to 1:18 methane/water ratio) in pure and salt (0–5 wt %) water environments at 50 MPa and 260 K. A couple of new findings analyzed from the number of cages and F 4φ order parameter are as follows: (a) 1:6 (methane/water ratio) is an optimum ratio for the rapid growth of a properly ordered hydrate in pure water at which the hydrate growth retards with increasing salt concentration, (b) there is an inconsequential difference between methane hydrate dynamics in pure water and 0.8 and 1.5 wt % salt water at a ratio of 1:12 (methane/water), and (c) lower methane (1:18) and salt (0.8 wt %) concentrations promote hydrate growth. Besides, this study observes the structural coexistence of S-I and S-II methane hydrates as the large 51264 cages appear along with the small 512 and large 51262 cages, in which the low methane concentration favors the S-II structure.

show abstract

Section: Methane Hydrate Dynamics In Saltmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microscopic Molecular Insights into Hydrate Formation and Growth in Pure and Saline Water Environments

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Bai et al studied the effect of ions on hydrate nucleation and growth using molecular dynamics simulations, the results of which corresponded well with those of the experiments . The increase in ionic strength extended the induction time, enhancing the inhibitive effect.…”

Section: Ngh Phase Equilibria and Kinetics Research In Chinamentioning

confidence: 63%

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

Shi¹,

Song²,

Duan³

et al. 2021

Energy Fuels

View full text Add to dashboard Cite

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.

show abstract

“…Where m i refers to the mass mole concentration of each type of ion and z i is the number of charges of each type of ion. Bai et al . found that the charge and concentration of ions can affect the formation of hydrate, and the effect of charge is more significant.…”

Section: Resultsmentioning

confidence: 99%

Microscopic Insights into the Formation of Methane Hydrate in the Absence/Presence of Electrolyte Ions

Liu

Chen

2020

ChemistrySelect

View full text Add to dashboard Cite

The formation of methane hydrate can be effectively inhibited by the electrolyte ions, but it remains to be a long‐term challenge to describe its molecular mechanism. In this work, molecular dynamics simulations were performed to explore the inhibition process of electrolyte solutions at molecular level. The simulation results manifest that the presence of electrolyte ions reduces the possibility of water molecules forming cage clusters of hydrates. Additionally, the growth rate of hydrates is closely related to the ionic concentration and ionic strength of the electrolyte solutions while has no obvious relationship with the ionic species. Finally, the defect structure of the hydrate was noticed and it was found that a little of ions can replace the water molecules in the clathrate structure to form a cage.

show abstract

The effect of aqueous NaCl solution on methane hydrate nucleation and growth

Cited by 53 publications

References 58 publications

Microscopic Molecular Insights into Hydrate Formation and Growth in Pure and Saline Water Environments

Microscopic Molecular Insights into Hydrate Formation and Growth in Pure and Saline Water Environments

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

Microscopic Insights into the Formation of Methane Hydrate in the Absence/Presence of Electrolyte Ions

Contact Info

Product

Resources

About