Hydrate formation from clay bound water for CO2 storage

Sun, Youhong; Jiang, Shuhui; Li, Shengli; Wang, Xiaochu; Peng, Sen

doi:10.1016/j.cej.2020.126872

Cited by 76 publications

(28 citation statements)

References 47 publications

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“…Moreover, an increase in the interface area increases the nucleation rate [31]. Therefore, studies of the gas hydrates formation in porous media such as silica gel [32], activated carbon [27,32], corundum, silicon carbide [33], pumice [34], natural marine sediments [35], and clay minerals [36,37] were carried out. However, quartz sand remains the most common medium used for this purpose.…”

Section: Introductionmentioning

confidence: 99%

Influence of Water Saturation, Grain Size of Quartz Sand and Hydrate-Former on the Gas Hydrate Formation

et al. 2021

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The development of technologies for the accelerated formation or decomposition of gas hydrates is an urgent topic. This will make it possible to utilize a gas, including associated petroleum one, into a hydrate state for its further use or to produce natural gas from hydrate-saturated sediments. In this work, the effect of water content in wide range (0.7–50 mass%) and the size of quartz sand particles (porous medium; <50 μm, 125–160 μm and unsifted sand) on the formation of methane and methane-propane hydrates at close conditions (subcooling value) has been studied. High-pressure differential scanning calorimetry and X-ray computed tomography techniques were employed to analyze the hydrate formation process and pore sizes, respectively. The exponential growth of water to hydrate conversion with a decrease in the water content due to the rise of water–gas surface available for hydrate formation was revealed. Sieving the quartz sand resulted in a significant increase in water to hydrate conversion (59% for original sand compared to more than 90% for sieved sand). It was supposed that water suction due to the capillary forces influences both methane and methane-propane hydrates formation as well with latent hydrate forming up to 60% either without a detectable heat flow or during the ice melting. This emphasizes the importance of being developed for water–gas (ice–gas) interface to effectively transform water into the hydrate state. In any case, the ice melting (presence of thawing water) may allow a higher conversion degree. Varying the water content and the sand grain size allows to control the degree of water to hydrate conversion and subcooling achieved before the hydrate formation. Taking into account experimental error, the equilibrium conditions of hydrates formation do not change in all studied cases. The data obtained can be useful in developing a method for obtaining hydrates under static conditions.

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Section: Introductionmentioning

confidence: 99%

Influence of Water Saturation, Grain Size of Quartz Sand and Hydrate-Former on the Gas Hydrate Formation

et al. 2021

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“…Because the initial pressure would affect the nucleation process of CO 2 hydrate and the conversion rate grew fast in the initial stage of the hydrate formation during the experiments. The formation process of CO 2 hydrate directly turned into the nucleation growth stage in porous media below the freezing point 22,27,46,56 . The influence to initial pressure on hydrate formation process was not obvious to some extent.…”

Section: Resultsmentioning

confidence: 99%

“…23,24 In detail, the formation process and the conversion rate of hydrate were influenced by the particle size in porous media to some extent. 25,26 Studies from researchers demonstrated that the CO 2 storage in hydrate increased continuously with the increase of water content in the range of 5%-20%, 27 and the final conversion rate of the water to hydrate increased with the increase of the initial formation pressure. 28 Moreover, the larger particle of porous media could raise the discrete degree of ice particles in ice powder system, but there was relatively smaller specific surface area.…”

mentioning

confidence: 99%

Investigation of the formation behaviors of CO₂ hydrate in porous media below the freezing point

Zhang

Yang

et al. 2022

Env Prog and Sustain Energy

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The formation process of gas hydrate is a stochastic phenomenon considered to be significant for its application in the areas such as hydrate-based technology and natural gas hydrate exploitation. The formation behaviors of CO 2 hydrate were studied in porous media below the freezing point. In addition, the formation experiments were conducted in the high-pressure vessel under different temperature and pressure conditions. The formation process of CO 2 hydrate showed different formation behaviors in the porous media under different experimental conditions. The results showed that the formation rate was higher in earlier stage and the largest formation rate attained 7.18 Â 10 À4 mol h À1 . The influence of initial pressure on the formation rate was indistinctive in porous media below the freezing point. Particle size of the porous media played an important role in affecting the formation characteristic of CO 2 hydrate below the freezing point. The results indicated that, the smaller the particle size of porous media was, the larger the formation rate and the conversion rate of CO 2 hydrate. The maximum conversion rate was attained 90.61%. The results also indicated that CO 2 hydrate had a good gas storage capacity in porous media below the freezing point. The gas storage capacity was close to 160 L/L in frozen quartz sand with the particle size of 250 μm in the experiments. The relative results will provide some insight for sequestration and storage process of CO 2 gas in the form of hydrates into sediments.

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“…Compared with the montmorillonite with a higher water content, the water molecules bound by clay minerals in lower water content cores have stronger interactions with the surface of montmorillonite. Therefore, the water activity is significantly lowered, 54,55 leading to a larger dissociation temperature depression.…”

Section: Dissociation Conditions Of Methane Hydrate In Clayey Silt Coresmentioning

confidence: 99%

Experimental investigation and modeling on the dissociation conditions of methane hydrate in clayey silt cores

Sun

Yang

et al. 2022

AIChE Journal

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As the majority of global natural gas hydrate reserve, the dissociation conditions of hydrate in clayey silts are of great significance for its efficient production. In this work, the dissociation conditions of methane hydrate in clayey silt cores were experimentally measured by step-heating method at the temperature range of 280.76-289.55 K and pressure range of 8.11-15.03 MPa, respectively. Various cores including quartz powder, montmorillonite, and South China Sea sediments at the water content range of 20%-33% were used for investigation. The results showed that the dissociation temperatures of methane hydrate in clayey silt cores depressed compared to bulk hydrate. The grain size, salinity, and lithology of clayey silt cores significantly affect the dissociation conditions of hydrate. In comparison to grain size, salinity, and lithology had a more significant influence on the equilibrium temperature depression.The dissociation temperature depression of methane hydrate was considered as a consequence of the water activity depression which is caused by the effect of capillary, salt, or clay. A water activity meter was used to measure the water activity in clayey silt cores. The influence of salt component and mineral characteristics on the water activity was investigated. By combining the measured water activity data with the Chen-Guo model, a novel water activity measurement (WAM) method for the hydrate dissociation conditions prediction was proposed. With the maximum deviation less than 12%, the predicted results are in good agreement with the experimental data. It demonstrated that the WAM method could effectively predict the dissociation conditions of methane hydrate in clayey silts with convenience and accuracy.

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Hydrate formation from clay bound water for CO2 storage

Cited by 76 publications

References 47 publications

Influence of Water Saturation, Grain Size of Quartz Sand and Hydrate-Former on the Gas Hydrate Formation

Influence of Water Saturation, Grain Size of Quartz Sand and Hydrate-Former on the Gas Hydrate Formation

Investigation of the formation behaviors of CO₂ hydrate in porous media below the freezing point

Experimental investigation and modeling on the dissociation conditions of methane hydrate in clayey silt cores

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Hydrate formation from clay bound water for CO2 storage

Cited by 76 publications

References 47 publications

Influence of Water Saturation, Grain Size of Quartz Sand and Hydrate-Former on the Gas Hydrate Formation

Influence of Water Saturation, Grain Size of Quartz Sand and Hydrate-Former on the Gas Hydrate Formation

Investigation of the formation behaviors of CO2 hydrate in porous media below the freezing point

Experimental investigation and modeling on the dissociation conditions of methane hydrate in clayey silt cores

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Investigation of the formation behaviors of CO₂ hydrate in porous media below the freezing point