Existence of a memory effect between hydrates with different structures (I, II, and H)

Zhao, Jiafei; Wang, Chaojie; Yang, Mingjun; Liu, Weiguo; Xu, Kun; Liu, Yu; Song, Yongchen

doi:10.1016/j.jngse.2015.06.031

Cited by 29 publications

(11 citation statements)

References 38 publications

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“…54 As reported by the other scholars, the memory effect could signicantly shorten the induction time of the gas hydrate nucleation, depending on the dissociation state and the duration in which the system has been out of its stability zone. [55][56][57] Referring to Fig. 2, the dissociation state of the system is relatively close to its stability zone at 7 MPa.…”

Section: Kineticsmentioning

confidence: 78%

Effect of thermal formation/dissociation cycles on the kinetics of formation and pore-scale distribution of methane hydrates in porous media: a magnetic resonance imaging study

Farahani

Guo

Zhang

et al. 2021

Sustainable Energy Fuels

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Section: Kineticsmentioning

confidence: 78%

Effect of thermal formation/dissociation cycles on the kinetics of formation and pore-scale distribution of methane hydrates in porous media: a magnetic resonance imaging study

Farahani

Guo

Zhang

et al. 2021

Sustainable Energy Fuels

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“…However, the presence of hydrate seed or water from ice melting could significantly shorten the induction time for hydrate reformation [29]. This could be attributed to the memory effect of hydrate [30]. Consequently, the capillary loaded with CP and water was first dipped into liquid nitrogen (where ice generated), and then put into a water bath with an initial temperature of 270.15 K. With the increase in temperature, CP hydrate formed first at the CP-ice interface at a temperature of slightly above 273.15 K [31,32].…”

Section: Methodsmentioning

confidence: 99%

Morphology Investigation on Cyclopentane Hydrate Formation/Dissociation in a Sub-Millimeter-Sized Capillary

Sun

et al. 2019

Crystals

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The formation, dissociation, and reformation of cyclopentane (CP) hydrate in a sub-millimeter-sized capillary were conducted in this work, and the morphology of CP hydrate was obtained during above processes, respectively. The influences of the supercooling degree, i.e., the hydrate formation driving force, on CP hydrate crystals’ aspect and growth rate were also investigated. The results demonstrate that CP forms hydrate with the water melting from ice at the interface between the CP and melting water at a temperature slightly above 273.15 K. With the action of hydrate memory effect, the CP hydrate in the capillary starts forming at the CP-water interface or CP–water–capillary three-phase junction and grows around the CP–water interface. The appearance and growth rate of CP hydrate are greatly influenced by the supercooling degree. It indicates that CP hydrate has a high aggregation degree and good regularity at a high supercooling degree (or a low formation temperature). The growth rate of CP hydrate crystals greatly increases with the supercooling degree. Consequently, the temperature has a significant influence on the formation of CP hydrate in the capillary. That means the features of CP hydrate crystals in a quiescent system could be determined and controlled by the temperature setting.

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“…Therefore, as the gas is consumed and the pressure drops, the rate of water consumption becomes lower, which indicates a reduction in the rate of hydrate formation. 36,37 The hydrate formation stops when the water consumption reaches a steady value. These observations suggest that the process of gas hydrate formation from shear stabilized emulsions occurs in three main stages, which are consistent with the description from Li et al 38 After the hydrate formation stops, a constant stage (C-D) is observed.…”

Section: Resultsmentioning

confidence: 99%

“…The driving force for hydrate formation is the pressure difference between the surrounding gas pressure and the equilibrium pressure at the same temperature. Therefore, as the gas is consumed and the pressure drops, the rate of water consumption becomes lower, which indicates a reduction in the rate of hydrate formation . The hydrate formation stops when the water consumption reaches a steady value.…”

Section: Resultsmentioning

confidence: 99%

Dynamics of hydrate formation and deposition under pseudo multiphase flow

2017

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Gas hydrate formation is considered one of the major challenges in the flow assurance of deepwater oil and gas pipelines, as their blockage by hydrate can lead to significant production/economic loss and safety risk. Understanding the hydrate formation and deposition processes can improve the management methods in field development and production. This study used a high‐pressure rocking cell to simulate multiphase flow conditions to visually investigate the hydrate formation and deposition from an oil‐gas‐water system. The changing hydrate morphologies, flow pattern and particle distribution during hydrate formation were studied and a conceptual model was proposed. The relative motion of hydrates to the cell wall and the final morphology of the hydrate chunks are found to be two critical parameters for evaluating hydrate deposition characteristics in the flow system. Five types of hydrate deposition morphologies are observed and these are correlated to the hydrate porosity. © 2017 American Institute of Chemical Engineers AIChE J, 63: 4136–4146, 2017

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Existence of a memory effect between hydrates with different structures (I, II, and H)

Cited by 29 publications

References 38 publications

Effect of thermal formation/dissociation cycles on the kinetics of formation and pore-scale distribution of methane hydrates in porous media: a magnetic resonance imaging study

Effect of thermal formation/dissociation cycles on the kinetics of formation and pore-scale distribution of methane hydrates in porous media: a magnetic resonance imaging study

Morphology Investigation on Cyclopentane Hydrate Formation/Dissociation in a Sub-Millimeter-Sized Capillary

Dynamics of hydrate formation and deposition under pseudo multiphase flow

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