Direct measurements of the interactions between methane hydrate particle-particle/droplet in high pressure gas phase

Liu, Chenwei; Chenru, Zhou; Li, Mingzhong; Tong, Shikun; Qi, Minhui; Wang, Zhiyuan

doi:10.1016/j.fuel.2022.126190

Cited by 13 publications

(16 citation statements)

References 41 publications

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“…It was difficult to separate them even if the force was >39.77 mN/m. Embedding and sintering of the gas hydrate particles also have been observed in the work of Liu et al For CP hydrate with urea, the liquid bridge was relatively stable under the longer contact time and was not further converted into hydrate during the contact process (seen in Video 2). This is because the higher concentration of the thermodynamic inhibitor hinders the further conversion of hydrate, and the existence of a lubricant liquid layer makes the microstructure of the particle surface unable to be embedded with it .…”

Section: Resultssupporting

confidence: 66%

“…The measurement of hydrate interparticle interactions by using a micromechanical force (MMF) apparatus has been reported. − These experimental results of adhesion can be immensely valuable for industrial applications. For example, the adhesion force of hydrate increases with increases in contact time, experimental temperature, and preload force and increases with a decrease in annealing time, which provides guidance for the control of the operation conditions and flow rate of a pipeline. − Free water is an important source of hydrate adhesion; therefore, it is beneficial to enhance oil–water separation procedures in oil and gas pipelines. ,, Lee et al studied the adhesion forces of CP hydrate in the presence of thermodynamic inhibitors (NaCl, methanol, ethanol, and monoethylene glycol), and the results suggested that the addition of higher concentrations of thermodynamic inhibitors would increase the adhesion force of CP hydrate particles . Wang et al studied the adhesion forces of CH 4 /C 2 H 6 hydrate particles in the presence of NaCl, and the results showed that the adhesion forces of gas hydrates decreased with a higher NaCl concentration .…”

Section: Introductionmentioning

confidence: 99%

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Interfacial Adhesion Forces of Hydrate Particles in the Presence of Hydrate Inhibitors

et al. 2022

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Hydrate inhibitors are traditionally utilized to prevent hydrate plugging. In this study, the adhesion forces of cyclopentane (CP) hydrates with thermodynamic inhibitors (ethanol, urea, and NaCl) and anti-agglomerant inhibitors [sorbitan monooleate (Span 80) and lecithin] were measured to understand the effects of hydrate inhibitors on the adhesion forces of hydrates. It was found that the thermodynamic inhibitors increased the early hydrate interparticle adhesion force due to the enhanced liquid bridge force. However, the liquid bridge acted as a lubricant layer to prevent the irreversible agglomeration of hydrate after long-term contact. The hydrate adhesion forces decreased by 90.5−93.0% and 76.6−92.7% with an increase in the concentration of Span 80 and lecithin, respectively, from 0.1 to 1 wt %. Both rough morphology and low interfacial tension contributed to the adhesion force decrease of hydrate after the addition of anti-agglomerant inhibitors. The results may be helpful for understanding the mechanism of influence and quantifying the impact of hydrate inhibitors on hydrate interparticle adhesion force.

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Section: Resultssupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Interfacial Adhesion Forces of Hydrate Particles in the Presence of Hydrate Inhibitors

et al. 2022

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“…With the hydrate film covering surface of the liquid bridge, the cohesive force was established by the combined force of the liquid bridge and the hydrate film. 28,29 Since the tensile strength of hydrate was much greater than that of water droplets, the increase in subcooling led to an overall increase in cohesive force. The cohesive force between the hydrate particles and the wall hydrate at different subcooling degrees was directly measured when the wall droplets grew to unusual degrees of hydrate.…”

Section: Effect Of Subcooling On the Cohesive Force Behavior Of Hydra...mentioning

confidence: 99%

“…Previous studies have shown that the cohesive force between the gas hydrate particles is very low. Although the measurement results are far greater than that of cyclopentane hydrate particles at atmospheric pressure, it is still difficult to explain the strong agglomeration of gas hydrate in the pipeline and the strong cohesive force behavior on the pipe wall. ,, Compared with the cohesive force between gas hydrate particles, the cohesive force between hydrate and water droplets is larger, which is deemed to be the main factor leading to hydrate agglomeration. , Therefore, researchers began to study the forces between hydrate particles and water droplets. Liu et al directly measured the cohesive force between methane hydrate particles and particles/droplets through a high-pressure micromechanical force device.…”

Section: Introductionmentioning

confidence: 99%

Study of Sintering Behavior of Methane Hydrate Particles on the Wall Surface

Zhou,

Ren,

et al. 2024

Langmuir

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The sintering of hydrate aggregates on the pipe wall is a major form of hydrate deposition. Understanding the sintering behavior of hydrates on the wall is crucial for promoting hydrate safety management and preventing pipeline blockage. However, limited research currently exists on this topic. In this study, the cohesive force strength of hydrate particles on the wall surface under different conditions was directly measured using a highpressure micromechanical force device (HP-MMF). Subsequently, the effects of subcooling and glycine on the cohesive force were investigated. The results indicate that the cohesive force is influenced by different growth states during the process of free water on the wall surface gradually growing into hydrate. Three states with larger measured values during the growth process were selected for research. Observation showed that increased subcooling strengthened sintering by accelerating the growth rate of the hydrate film, resulting in a significant increase in cohesive force. The role of glycine in the methane hydrate system was then evaluated. Glycine was found to reduce the degree of sintering by reducing the growth rate of the hydrate film, thereby decreasing the cohesive force. The optimal concentration in the system was determined to be 0.25 wt %. Moreover, compared with low subcooling (1 °C), glycine had a better effect at high subcooling (5 °C). At 5 °C subcooling and the optimal concentration, the cohesive force in the wall droplet state decreases from 677.38 to 489.02 mN/m, the cohesive force at the low-saturation state decreases from 951.79 to 543.32 mN/m, and the cohesive force at the high-saturation state decreases from 1194.95 to 641.76 mN/m. These findings contribute to a better understanding of the cohesive force behavior of gas hydrate on the inner wall of the pipeline and provide basic data for reducing the risk of hydrate blockage.

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“…With the soaring global energy demand and the continuous development of land and shallow sea resources, deep-sea energy is considered to be the strategic inheritance area of global energy development in the 21st century. , The extraction of deep-sea oil and gas resources generally faces harsh conditions such as high pressure and low temperature, which leads to the precipitation of hydrates , and waxes , during the extraction and transportation process of oil and gas, causing pipeline blockage, production interruption, and other accidents, leading to serious economic problems. Therefore, hydrate prevention and control is a key issue in the flow assurance of oil and gas exploitation .…”

Section: Introductionmentioning

confidence: 99%

Study of Hydrate Particle Morphology and Cohesive Force in the Presence of Wax and Glycine

Zhou,

Ren,

et al. 2024

Energy Fuels

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During the operation of deep-sea pipelines, the accumulation and deposition of hydrates are important reasons for pipeline blockage. The current main measure to solve the hydrate plugging problem is the addition of low-dose inhibitors (LDHIs), but it is not yet known whether the precipitation of wax crystals will affect their effectiveness. Therefore, in this study, the hydrate cohesive force within the wax-free/wax-containing system was directly measured by using a micromechanical force device (MMF) and the reasons for the change in cohesive force were analyzed from a morphological point of view. The results showed that glycine was effective in reducing the cohesion between hydrate particles in both wax-free/wax-containing systems and still exerted the effect of antiagglomeration agent (AA) at very low concentrations (as low as 0.10 wt %). Moreover, the optimum concentration of glycine was 0.50 wt %. At this concentration, the cohesive force decreased from 8.54 to 7.07 mN/m in the wax-free system, a decrease of about 17.2%, while the cohesive force decreased from 5.94 to 2.15 mN/m in the wax-containing system, a decrease of about 63.8%. By observation of the morphology of the hydrate particles, the presence of glycine was found to reduce the volume of the liquid bridge by changing the surface roughness and wettability of the particles, thereby reducing the cohesive force. And when wax was contained in the system, the wax further reduced the wettability by adsorbing on the surface of the hydrate particles. However, under certain AA conditions, the increase in wax concentration (from 0.1 to 0.3 wt %) resulted in the free water inside the hydrate being more likely to form liquid bridges with the surrounding particles, thus weakening the effect of AA. This work analyzes the effect on cohesive force in the simultaneous presence of LDHIs and wax from a morphological point of view, which is beneficial in providing more insights into securing safe hydrate flow management.

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Direct measurements of the interactions between methane hydrate particle-particle/droplet in high pressure gas phase

Cited by 13 publications

References 41 publications

Interfacial Adhesion Forces of Hydrate Particles in the Presence of Hydrate Inhibitors

Interfacial Adhesion Forces of Hydrate Particles in the Presence of Hydrate Inhibitors

Study of Sintering Behavior of Methane Hydrate Particles on the Wall Surface

Study of Hydrate Particle Morphology and Cohesive Force in the Presence of Wax and Glycine

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