Thermodynamic stability and guest distribution of CH4/N2/CO2 mixed hydrates for methane hydrate production using N2/CO2 injection

Lim, Dongwook; Ro, Hyeyoon; Seo, Yongwon; Seo, Young-ju; Lee, Joo Yong; Kim, Se-Joon; Lee, Jaehyoung; Lee, Huen

doi:10.1016/j.jct.2016.11.012

Cited by 53 publications

(22 citation statements)

References 31 publications

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“…However, the addition of 10 mol% of N 2 caused the curve to shift slightly to high pressures and low temperatures region, thereby reducing gas hydrate formation threat in the system. This phenomenon according to Sloan and Koh [14], is because less N 2 is involve in cage occupancy since N 2 requires very higher pressures and low temperatures to form hydrates [34]. Fig.…”

Section: Effect Of N 2 and H 2 S Composition On The Hydrate Equilibrimentioning

confidence: 90%

Gas Hydrate Formation Phase Boundary Behaviour of Synthetic Natural Gas System of the Keta Basin of Ghana

Broni-Bediako¹,

Amorin²,

Bavoh³

2017

TOPEJ

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Background:Gas hydrates are considered as a major threat to the oil and gas flow assurance industry. At high pressure and low temperature conditions, gas hydrates form in pipelines and production facilities leading to pipeline blockages, high removal cost, environmental hazards and loss of lives. For a successful prevention of gas hydrate formation, predicting the hydrate formation phase boundary of hydrocarbon fluid composition becomes very necessary. Objective and Method:In this study, computer simulation software called PVTSim was used to predict hydrate formation phase boundary of synthetic natural gas composition of the Keta basin of Ghana at pressure and temperature ranges of 43.09 bar -350 bar and 12.87 °C -27.29°Crespectively. The effect of changes in natural gas composition (N 2 and H 2 S) and the presence of four commonly used thermodynamic gas hydrate inhibitors (methanol, ethanol, diethylene glycol and monoethylene glycol) on the hydrate formation phase boundary is also discussed. Prior to the study, the accuracy of PVTSim was validated with the hydrate formation phase data in literature. Results and Conclusion:Results suggested that the hydrate formation phase boundary decreased with increasing N 2 composition and increased with increasing H 2 S composition, suggesting that, the presence of H 2 S increases the threat of hydrate formation. However, a reduction in hydrate formation threat was observed in the presence of all four commonly used gas hydrate thermodynamic inhibitors with methanol demonstrating the highest inhibition effect.

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Section: Effect Of N 2 and H 2 S Composition On The Hydrate Equilibrimentioning

confidence: 90%

Gas Hydrate Formation Phase Boundary Behaviour of Synthetic Natural Gas System of the Keta Basin of Ghana

Broni-Bediako¹,

Amorin²,

Bavoh³

2017

TOPEJ

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“…While the thermodynamic properties of pure hydrogen are well established 36,37 , published properties of gas mixtures in relation to geological hydrogen storage 17,[38][39][40][41][42][43][44][45] do not cover the full range of additional gasses and often do not encompass the pressures and temperatures encountered within the hydrogen storage system (see Fig. 2).…”

Section: Background and Summarymentioning

confidence: 99%

Thermodynamic and transport properties of hydrogen containing streams

et al. 2020

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the use of hydrogen (H 2) as a substitute for fossil fuel, which accounts for the majority of the world's energy, is environmentally the most benign option for the reduction of CO 2 emissions. this will require gigawatt-scale storage systems and as such, H 2 storage in porous rocks in the subsurface will be required. accurate estimation of the thermodynamic and transport properties of H 2 mixed with other gases found within the storage system is therefore essential for the efficient design for the processes involved in this system chain. In this study, we used the established and regarded GERG-2008 Equation of State (EoS) and SupertRaPP model to predict the thermo-physical properties of H 2 mixed with CH 4 , N 2 , CO 2 , and a typical natural gas from the North-Sea. the data covers a wide range of mole fraction of H 2 (10-90 Mole%), pressures (0.01-100 MPa), and temperatures (200-500 K) with high accuracy and precision. Moreover, to increase ease of access to the data, a user-friendly software (H2Themobank) is developed and made publicly available.

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“…Ota et al (2005a); Ota et al (2005b) found that, CH 4 hydrate was decomposed during the replacement process, and the decomposition rate of large cage in CH 4 hydrate was faster than that of small cage. Lim et al (2017) investigated the cage occupancy of CH 4 /N 2 /CO 2 with different gas concentration and found that N 2 and CO 2 preferentially occupied small cages and large cages respectively. Sun et al (2017) demonstrated that CO 2 molecules in gas mixture control the entrance into hydrate cages.…”

Section: Introductionmentioning

confidence: 99%

Effect of Gas Exchange Interval on CH4 Recovery Efficiency and Study of Mechanism of CH4 Hydrate Replacement by CO2 Mixture

Ding

Hua-Qin

2021

Front. Energy Res.

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As an environment-friendly natural gas hydrate exploitation method, CO2 replacement method can not only achieve the purpose of mining natural gas hydrate, but also store the current greenhouse gas CO2 in the form of hydrate on the seabed, and maintain the stratum stability of hydrate deposit area. In order to improve the rate and efficiency of CH4-CO2 replacement reaction, researchers proposed to use CO2 contained gas mixture instead of pure CO2 to replace CH4 in natural gas hydrate. Based our previous work about CH4 hydrate recovery with 40% CO2 + 60% H2, in this study, the effect of gas concentration in gas phase on final CH4 recovery are investigated by implying different time interval of gas exchange operation. Experimental results show that The CH4 recovery efficiency is 10.41 when the gas exchange is continues through the whole replacement process, and CH4 recovery efficiency changes to 12.25, 32.24 and 28.86 when gas exchange operation is carried out every 12, 24, 36 h. Indicating that replaced CH4 needs to be discharged in time to avoid CH4 molecules being replaced to form hydrates again, and it is necessary to accurately control the time interval of gas exchange operation to avoid insufficient contact time between CO2 and H2 molecules and CH4 hydrate, which affects the final replacement efficiency. In addition, the mechanism of CO2 gas mixture containing small gas molecule such as H2, N2 are studied. The results indicate that when CO2 containing small molecules such as H2 and N2 displace CH4 hydrate, the existence of small molecules (H2, N2) can give rise to decompose the hydrate lattice and release CH4 gas. If the gas molecules (CO2, N2, H2, CH4) in the gas phase have enough driving force to enter the hydrate lattice and remain stability, CH4 hydrate will not decompose completely; If not, CH4 hydrate will be completely decomposed.

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Thermodynamic stability and guest distribution of CH4/N2/CO2 mixed hydrates for methane hydrate production using N2/CO2 injection

Cited by 53 publications

References 31 publications

Gas Hydrate Formation Phase Boundary Behaviour of Synthetic Natural Gas System of the Keta Basin of Ghana

Gas Hydrate Formation Phase Boundary Behaviour of Synthetic Natural Gas System of the Keta Basin of Ghana

Thermodynamic and transport properties of hydrogen containing streams

Effect of Gas Exchange Interval on CH4 Recovery Efficiency and Study of Mechanism of CH4 Hydrate Replacement by CO2 Mixture

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