Study on the growth rate of natural gas hydrate in water-in-oil emulsion system using a high-pressure flow loop

Lv, Xiaofang; Shi, Bohui; Zhou, Shidong; Peng, Haoping; Lei, Yun; Yu, Ping

doi:10.1039/c8ra07571a

Cited by 16 publications

(9 citation statements)

References 32 publications

(44 reference statements)

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“…Contrary to this result in the present study, Lv et al. , reported that the hydrate formation in the later stage is inhibited at a higher water flow rate because the gas‐liquid interface is covered by the formed hydrate, by promotion of the mass transfer. In this study, the decreasing trend of the hydrate formation rate was not observed.…”

Section: Resultscontrasting

confidence: 99%

Development and Continuous Operation of a Bench‐Scale System for the Production of O₃ + O₂ + CO₂ Hydrates

Hatsugai

Nakayama

Tomura³

et al. 2020

Chem Eng & Technol

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Ozone (O 3) has many industrial applications such as in sterilization. One of the long-term O 3 preservation methods is molecular storage in clathrate hydrate. In this study, an experimental system was developed for continuously forming O 3 + O 2 + CO 2 hydrates. The parameters that affect the continuous operation of the system and that lead to increases in the concentration of O 3 in the hydrates were also experimentally evaluated, implementing the method of quality engineering. After optimizing these operating parameters, the O 3 storage capacity in the hydrates was measured to be 0.26 wt % at 2 h of total operation time. By X-ray diffraction, it was found that the produced sample contained hydrates, and longterm preservation for 6 months was possible at the temperature of general freezing warehouses.

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Section: Resultscontrasting

confidence: 99%

Development and Continuous Operation of a Bench‐Scale System for the Production of O₃ + O₂ + CO₂ Hydrates

Hatsugai

Nakayama

Tomura³

et al. 2020

Chem Eng & Technol

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“…The driving force for gas hydrate growth can be increased by lowering the temperature (e.g., Taylor et al, 2007), which decreases methane solubility in water in the presence of hydrate (Lu et al, 2008; Servio & Englezos, 2002; Subramanian & Sloan, 2002) and thereby increases the amount of excess dissolved phase methane that can then be used for gas hydrate formation. The driving force can also be increased by raising the pressure (e.g., Lv et al, 2018), which dissolves more gas into the water. Cooling the system by a few degrees is far more effective at driving increased hydrate formation than is increasing pressure by a few MPa (1 MPa is roughly equivalent to 100 m of water in the marine environment).…”

Section: Rates Of Hydrate Phase Transitionsmentioning

confidence: 99%

Timescales and Processes of Methane Hydrate Formation and Breakdown, With Application to Geologic Systems

Ruppel

Waite

2020

JGR Solid Earth

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Gas hydrate is an ice‐like form of water and low molecular weight gas stable at temperatures of roughly −10°C to 25°C and pressures of ~3 to 30 MPa in geologic systems. Natural gas hydrates sequester an estimated one sixth of Earth's methane and are found primarily in deepwater marine sediments on continental margins, but also in permafrost areas and under continental ice sheets. When gas hydrate is removed from its stability field, its breakdown has implications for the global carbon cycle, ocean chemistry, marine geohazards, and interactions between the geosphere and the ocean‐atmosphere system. Gas hydrate breakdown can also be artificially driven as a component of studies assessing the resource potential of these deposits. Furthermore, geologic processes and perturbations to the ocean‐atmosphere system (e.g., warming temperatures) can cause not only dissociation, but also more widespread dissolution of hydrate or even formation of new hydrate in reservoirs. Linkages between gas hydrate and disparate aspects of Earth's near‐surface physical, chemical, and biological systems render an assessment of the rates and processes affecting the persistence of gas hydrate an appropriate Centennial Grand Challenge. This paper reviews the thermodynamic controls on methane hydrate stability and then describes the relative importance of kinetic, mass transfer, and heat transfer processes in the formation and breakdown (dissociation and dissolution) of gas hydrate. Results from numerical modeling, laboratory, and some field studies are used to summarize the rates of hydrate formation and breakdown, followed by an extensive treatment of hydrate dynamics in marine and cryospheric gas hydrate systems.

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“…Here, the influence of oil cut also can be justified. According to the literature, oil cut plays a very minute role in gas hydrate formation/dissociation studies in oil–water emulsions compared to that of water cut. − The increase in oil cuts in the system increases the inhibition of gas hydrate formation. This is due to the presence of a mixture of various inhibition mechanisms and possibly a rivalry between mechanisms for inhibition promotion …”

Section: Resultsmentioning

confidence: 99%

Investigation on Thermodynamic Equilibrium Conditions of Methane Hydrates in Multiphase Gas-Dominant Pipelines

et al. 2021

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The estimation of thermodynamic equilibrium conditions of methane hydrates in the presence of crude oil based on experiments is shown in this research work. This pipeline system replicated the gas-dominant multiphase transmission pipelines at deep-sea regions. An experimental study is done by the usage of a Raman gas hydrate reactor. The pressure was maintained in the range of 3−8 MPa for the experimental study. The water cut is kept constant throughout the system as 30%. Initially, the experimental setup is calibrated by using carbon dioxide gas. Then, methane hydrates are formed with and without crude oil. The methane hydrates that are created without the presence of crude oil are validated with simulation that is performed using CSMGEM, PVTSIM software, and literature data. Then, the thermodynamic conditions are found for the methane hydrate formation in the presence of crude oil with an addition of a 15% oil cut to the system. From these results, the phase behavior of a multiphase system is evaluated. The formation of methane hydrates in the system was found to be affected by the presence of an additional oil phase that exhibited an inhibition behavior. This research validates all the multiphase systems that contain similar hydrocarbon and gas compositions.

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Study on the growth rate of natural gas hydrate in water-in-oil emulsion system using a high-pressure flow loop

Abstract: Hydrate slurry transport technology in deep-water pipelines has become a focal point among worldwide researches, due to its high economic efficiency.

Cited by 16 publications

References 32 publications

Development and Continuous Operation of a Bench‐Scale System for the Production of O₃ + O₂ + CO₂ Hydrates

Development and Continuous Operation of a Bench‐Scale System for the Production of O₃ + O₂ + CO₂ Hydrates

Timescales and Processes of Methane Hydrate Formation and Breakdown, With Application to Geologic Systems

Investigation on Thermodynamic Equilibrium Conditions of Methane Hydrates in Multiphase Gas-Dominant Pipelines

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Study on the growth rate of natural gas hydrate in water-in-oil emulsion system using a high-pressure flow loop

Abstract: Hydrate slurry transport technology in deep-water pipelines has become a focal point among worldwide researches, due to its high economic efficiency.

Cited by 16 publications

References 32 publications

Development and Continuous Operation of a Bench‐Scale System for the Production of O3 + O2 + CO2 Hydrates

Development and Continuous Operation of a Bench‐Scale System for the Production of O3 + O2 + CO2 Hydrates

Timescales and Processes of Methane Hydrate Formation and Breakdown, With Application to Geologic Systems

Investigation on Thermodynamic Equilibrium Conditions of Methane Hydrates in Multiphase Gas-Dominant Pipelines

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Development and Continuous Operation of a Bench‐Scale System for the Production of O₃ + O₂ + CO₂ Hydrates

Development and Continuous Operation of a Bench‐Scale System for the Production of O₃ + O₂ + CO₂ Hydrates