Development of thermodynamic frameworks for modeling of clathrate hydrates stability conditions in porous media

Azimi, Arezoo; Javanmardi, Jafar; Mohammadi, Amir H.

doi:10.1016/j.molliq.2021.115463

Cited by 10 publications

(3 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The inhibition effect of a porous medium on the hydrate equilibrium curve was modeled by using a modified version of the van der Waals-Platteeuw-based thermodynamic models (van der Waals and Platteeuw [46]; Parrish and Prausnitz [47]; Holder et al [48,49], where an extra term was added to account for the lowering of the water activity as a result of the presence of the porous medium. Such works were reported, among others by Clarke et al [50], Klauda and Sandler [12,51], Peddireddy et al [52], Sun and Duan [53], Song et al [54], and Duan et al [55], Li et al [56], Zarifi et al [37], Zhou et al [57], and Azimi et al [58]. An additional discussion and related references on the effect of the capillarity in narrow pores on the hydrate equilibrium conditions can be found in the recent study by De La Fuente et al [59].…”

Section: Introductionmentioning

confidence: 62%

Study of the Critical Pore Radius That Results in Critical Gas Saturation during Methane Hydrate Dissociation at the Single-Pore Scale: Analytical Solutions for Small Pores and Potential Implications to Methane Production from Geological Media

2021

View full text Add to dashboard Cite

We examine the critical pore radius that results in critical gas saturation during pure methane hydrate dissociation within geologic porous media. Critical gas saturation is defined as the fraction of gas volume inside a pore system when the methane gas phase spans the system. Analytical solutions for the critical pore radii are obtained for two, simple pore systems consisting of either a single pore-body or a single pore-body connected with a number of pore-throats. Further, we obtain critical values for pore sizes above which the production of methane gas is possible. Results shown in the current study correspond to the case when the depression of the dissociation temperature (due to the presence of small-sized pores; namely, with a pore radius of less than 100 nm) is considered. The temperature shift due to confinement in porous media is estimated through the well-known Gibbs-Thompson equation. The particular results are of interest to geological media and particularly in the methane production from the dissociation of natural hydrate deposits within off-shore oceanic or on-shore permafrost locations. It is found that the contribution of the depression of the dissociation temperature on the calculated values of the critical pore sizes for gas production is limited to less than 10% when compared to our earlier study where the porous media effects have been ignored.

show abstract

Section: Introductionmentioning

confidence: 62%

Study of the Critical Pore Radius That Results in Critical Gas Saturation during Methane Hydrate Dissociation at the Single-Pore Scale: Analytical Solutions for Small Pores and Potential Implications to Methane Production from Geological Media

2021

View full text Add to dashboard Cite

show abstract

“…The microporous structure of corncob pith also provides a special environment, which may affect the properties of the water in it, and affects the properties of the hydrate. Due to the micro-nano pore structure of the corncob pith, the existing capillary effect may influence the characteristics of water [36,37], such as water molecular motion, which further influences the gas transmission kinetics and the formation of hydrates. Moreover, the dynamics of water in biological tissue may also be related to water-biosurface interaction.…”

Section: Thermodynamic Stability Investigationmentioning

confidence: 99%

Methane Adsorption Properties in Biomaterials: A Possible Route to Gas Storage and Transportation

et al. 2022

Energies

View full text Add to dashboard Cite

Methane can be stored in biomaterials rapidly in hydrate form with low energy consumption. Considering the high cost of biomaterials (vegetables or fruits), agricultural wastes may be more practical. In this work, the characteristics of methane storage in two low-cost agricultural wastes, eggplant, and static water, are studied and compared. The methane adsorption rates and capacities were greatly enhanced in three biomaterials compared with that in the static water, while only corncob pith maintained relatively high gas adsorption capacity (72 v/v) and adsorption rate (~0.0300 MPa/min) in repeatable gas adsorption-desorption processes. Further investigations on the gas adsorption behavior in the corncob pith revealed that the porous structure of corncob pith generates larger specific surface areas, providing more nucleation sites for hydrate nucleation. In addition, the hydrophobic and hydrophilic performance of corncob pith components also affect the hydrate formation. The porous structure of corncob pith reduces its water activity, which decreases the stability of methane hydrate (~0.6 MPa higher at 273.15 K for equilibrium pressure than bulk phase). These results demonstrate the great gas adsorption performance and mild storage-transportation conditions of low-cost agricultural wastes and provide significant information in promoting their application in gas storage and transportation.

show abstract

“…This model gives the value of the temperature shift of the hydrate formation curve 2 of 17 depending on capillary radius (the shift is increased while decreasing the capillary radius). This was followed by numerous attempts of experimental study on gas hydrate conditions in different porous media [2][3][4][5][6][7][8][9][10][11][12][13][14], as well as attempts to present theoretical estimations for the description of size distribution and its influence on phase equilibrium in a porous medium [14][15][16][17][18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Influence of Hydrate-Forming Gas Pressure on Equilibrium Pore Water Content in Soils

et al. 2021

View full text Add to dashboard Cite

Natural gas hydrates (primarily methane hydrates) are considered to be an important and promising unconventional source of hydrocarbons. Most natural gas hydrate accumulations exist in pore space and are associated with reservoir rocks. Therefore, gas hydrate studies in porous media are of particular interest, as well as, the phase equilibria of pore hydrates, including the determination of equilibrium pore water content (nonclathrated water). Nonclathrated water is analogous to unfrozen water in permafrost soils and has a significant effect on the properties of hydrate-bearing reservoirs. Nonclathrated water content in hydrate-saturated porous media will depend on many factors: pressure, temperature, gas composition, the mineralization of pore water, etc. In this paper, the study is mostly focused on the effect of hydrate-forming gas pressure on nonclathrated water content in hydrate-bearing soils. To solve this problem, simple thermodynamic equations were proposed which require data on pore water activity (or unfrozen water content). Additionally, it is possible to recalculate the nonclathrated water content data from one hydrate-forming gas to another using the proposed thermodynamic equations. The comparison showed a sufficiently good agreement between the calculated nonclathrated water content and its direct measurements for investigated soils. The discrepancy was ~0.15 wt% and was comparable to the accuracy of direct measurements. It was established that the effect of gas pressure on nonclathrated water content is highly nonlinear. For example, the most pronounced effect of gas pressure on nonclathrated water content is observed in the range from equilibrium pressure to 6.0 MPa. The developed thermodynamic technique can be used for different hydrate-forming gases such as methane, ethane, propane, nitrogen, carbon dioxide, various gas mixtures, and natural gases.

show abstract

Development of thermodynamic frameworks for modeling of clathrate hydrates stability conditions in porous media

Cited by 10 publications

References 45 publications

Study of the Critical Pore Radius That Results in Critical Gas Saturation during Methane Hydrate Dissociation at the Single-Pore Scale: Analytical Solutions for Small Pores and Potential Implications to Methane Production from Geological Media

Study of the Critical Pore Radius That Results in Critical Gas Saturation during Methane Hydrate Dissociation at the Single-Pore Scale: Analytical Solutions for Small Pores and Potential Implications to Methane Production from Geological Media

Methane Adsorption Properties in Biomaterials: A Possible Route to Gas Storage and Transportation

Influence of Hydrate-Forming Gas Pressure on Equilibrium Pore Water Content in Soils

Contact Info

Product

Resources

About