Phase behavior of methane hydrate in silica sand

Sun, Shicai; Liu, Changling; Ye, Yuguang; Liu, Yufeng

doi:10.1016/j.jct.2013.09.045

Cited by 73 publications

(44 citation statements)

References 34 publications

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“…The standard uncertainties of pressure and temperature are 0.02 MPa and 0.1 K, respectively. The details about the experimental equipment can be found in the literature [37,40].…”

Section: Experimental Equipment and Methodsmentioning

confidence: 99%

“…Because the pore size is not uniform owing to the silica sand with a distribution of particle size, phase equilibrium of methane hydrate occurring in pores of different size may also differ. Although multiple points of hydrate equilibrium from the point E to B can be obtained theoretically by multi-step heating method, the corresponding concentrations of solution and corresponding pore sizes are variable and difficult to determined [29,37]. In this work, the point B is regarded as the (gas + liquid + solid + hydrate) equilibrium point.…”

Section: Hydrate Formation and Dissociationmentioning

confidence: 99%

“…Methane hydrate equilibrium in single silica sand or chloride salt solution used in this work has been studied [18,36,37]. The results indicate that the equilibrium temperature of methane hydrate is depressed in chloride salt solution while methane hydrate equilibrium condition in silica sand depends on the particle size.…”

Section: (Gas + Liquid + Solid + Hydrate) Phase Equilibriummentioning

confidence: 99%

“…When the ionic solution is mixed with silica sand, the distribution of water molecules in solution may be changed due to the interaction between ions, water molecules and solid particles so that the activity of water is also changed. [37]; }, 0.0284NaCl [18]; h, 0.0553NaCl [18]; D, 0.1047NaCl [18]; s, pure water [1]. In the mixtures of fine-grained silica sand and chloride salt solution, water molecules on the surface of solid particles are attracted not only by the electrostatic attraction from the solid phase surface but also by the electrostatic field from electrolyte ions.…”

Section: (Gas + Liquid + Solid + Hydrate) Phase Equilibriummentioning

confidence: 99%

“…Based on the experimental results, the theoretical pore radius that could affect hydrate equilibrium was calculated. Sun et al [36,37] measured hydrate equilibrium in silica sand and the results indicated that hydrate equilibrium condition depended on the particle size. As discussed above, phase equilibrium of gas hydrates is obviously changed in the presence of ionic solution or seawater, namely hydrate formation will be inhibited.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Phase equilibrium of methane hydrate in silica sand containing chloride salt solution

Sun

Yayun

Zhang

et al. 2015

The Journal of Chemical Thermodynamics

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“…The standard uncertainties of pressure and temperature are 0.02 MPa and 0.1 K, respectively. The details about the experimental equipment can be found in the literature [37,40].…”

Section: Experimental Equipment and Methodsmentioning

confidence: 99%

Section: Hydrate Formation and Dissociationmentioning

confidence: 99%

Section: (Gas + Liquid + Solid + Hydrate) Phase Equilibriummentioning

confidence: 99%

Section: (Gas + Liquid + Solid + Hydrate) Phase Equilibriummentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Phase equilibrium of methane hydrate in silica sand containing chloride salt solution

Sun

Yayun

Zhang

et al. 2015

The Journal of Chemical Thermodynamics

Self Cite

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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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Effect of surface curvature and wettability on nucleation of methane hydrate

Fan

Wang

et al. 2022

AIChE Journal

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Natural gas hydrate nucleation is a complex physical and chemical process that is not well understood presently. In this article, an improved thermodynamic model is proposed to analyze the effects of surface curvature and wettability on methane hydrate nucleation for the first time. The results indicate that methane hydrate nucleation is more difficult on hydrophilic curvature surfaces under the same conditions, with a larger critical nucleation radius and required energy barrier than on hydrophobic surfaces. Furthermore, a convex surface is more favorable for forming methane hydrate under the same conditions than a concave surface. The model's results are critical in elucidating the microscopic mechanism of methane hydrate nucleation and providing a theoretical foundation for developing technologies for strengthening and inhibiting hydrate formation.

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Phase behavior of methane hydrate in silica sand

Cited by 73 publications

References 34 publications

Phase equilibrium of methane hydrate in silica sand containing chloride salt solution

Phase equilibrium of methane hydrate in silica sand containing chloride salt solution

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

Effect of surface curvature and wettability on nucleation of methane hydrate

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