Decomposition characteristics of methane hydrate in porous media under continuous and intermittent microwave heating

Zhu, Yue; Li, Xuhui; Zhao, Cunyuan; Zhang, Jing; Bondarenko, Volodymyr; Dreus, Andrii; Jiang, Liang; Li, Xiaoyang; Zhu, Jinlong; Wang, Pengfei; Li, Shengli; Лиу, Баочанг

doi:10.1016/j.fuel.2022.126230

Cited by 14 publications

(15 citation statements)

References 50 publications

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“…Second, the gas fugacity differences in gas phase, water layer, and dead-end pores during depressurization-induced hydrate decomposition result in the uneven hydrate decomposition, such as top-down hydrate decomposition front . The hydrate upper layer of the cell decomposed because of depressurization and microwave stimulation, whereas the undecomposed hydrate far from microwave source relied on macroscopic heat conduction to decompose which would be limited by microwave penetration depth . After large amounts of hydrate decomposed rapidly at P w = 1.5 MPa, the amount of hydrate decreased and the mass transfer effect was weakened, resulting in a longer macroscopic heat conduction time and decomposition time.…”

Section: Resultsmentioning

confidence: 99%

“…From the perspective of energy efficiency, high microwave power improves the gas production rate with energy consumption. 38 In this study, the duration of microwave heating was not appropriate for the commercial exploitation of natural gas hydrate. A reasonable microwave stimulation time can improve the gas production efficiency without excess energy consumption.…”

Section: Energy Efficiencymentioning

confidence: 92%

“…Methane gas with a purity of 99.999% was provided by Shenzhen Huatepeng Special Gas Co., Ltd. Distilled water was prepared in the laboratory, with a resistivity of 18.2 MΩ·cm. Natural quartz sand with a particle size of 106–150 μm was provided by Minghai Environmental Protection Quartz Sand Factory, and the microstructure and the size distribution of quartz sand were described in our former paper …”

Section: Methodsmentioning

confidence: 99%

“…Natural quartz sand with a particle size of 106−150 μm was provided by Minghai Environmental Protection Quartz Sand Factory, and the microstructure and the size distribution of quartz sand were described in our former paper. 38 A mixture comprising 439 g of quartz sand and 73 mL of distilled water was placed in the high-pressure cell, where the height of the mixture was 62 mm from the bottom of the cell. After sealing and vacuuming the cell, methane gas was injected until the pressure of the cell reached 6 MPa.…”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

“…It is worth noting that temperature gradients existed between T1, T2, and T3 because of the limited microwave penetration depth. 38 3.2.2. Gas Production Characteristics.…”

Section: Decomposition Characteristics Under Depressurization Combine...mentioning

confidence: 99%

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Methane Hydrate Dissociation in Quartz Sand by Depressurization Combined with Microwave Stimulation

Zhu

Wang

et al. 2023

Energy Fuels

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Depressurization combined with thermal stimulation is a promising method for gas hydrate production. Owing to its advantages of rapid uniform heating, microwave radiation is an efficient source of heat. However, the mechanisms of hydrate decomposition under depressurization combined microwave stimulation are currently unclear. In this study, methane hydrate was synthesized under 6 MPa and 2 °C, with hydrate saturation of approximately 42% in natural quartz sand. We then compared hydrate decomposition via rapid depressurization and piecewise depressurization, with or without microwave stimulation at 2.45 GHz and 400 W. When using the depressurization method alone, the hydrate decomposition rate increased with the depressurization amplitude. However, in the last stage of hydrate decomposition, the external flow of gas was hindered by the Jamin effect, especially under larger depressurization amplitudes; therefore, extremely low production pressure is not justified. When combined with microwave stimulation, both depressurization methods resulted in increased reservoir temperature within a few seconds, and microwave heating provided an extra driving force for hydrate decomposition. Furthermore, microwave heating was more effective when larger amounts of undecomposed hydrate remained after depressurization. When depressurization was combined with microwave stimulation, the average gas production rate at 100% gas production was 0.269−0.601 L/min, which was significantly higher than that for depressurization alone. However, the energy efficiency ratio was approximately 1, which has no practical value. Conversely, the average gas production rate at 90% gas production was 0.452−2.945 L/min and the energy efficiency ratio was 2.9−17.6. Under the combined method, gas hydrate decomposition at a production pressure of 1.9 MPa achieved the subtle balance between the average gas generation rate and energy efficiency. Thus, optimizing the gas production pressure and microwave stimulation time can improve the average gas production rate and energy efficiency ratio according to the reservoir hydrate conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Energy Efficiencymentioning

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Section: Experimental Materials and Methodsmentioning

confidence: 99%

“…It is worth noting that temperature gradients existed between T1, T2, and T3 because of the limited microwave penetration depth. 38 3.2.2. Gas Production Characteristics.…”

Section: Decomposition Characteristics Under Depressurization Combine...mentioning

confidence: 99%

See 3 more Smart Citations

Methane Hydrate Dissociation in Quartz Sand by Depressurization Combined with Microwave Stimulation

Zhu

Wang

et al. 2023

Energy Fuels

Self Cite

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show abstract

Enhancing hydrate reservoir temperature by microwave heating: Research on different types of microwave radiation antenna

Fan,

Zhang,

Wang

et al. 2025

Applied Thermal Engineering

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Structural parameters optimization of microwave radiation antenna in hydrate reservoir based on multiphysical coupling model

Zhang,

Wang,

Wang

et al. 2024

Case Studies in Thermal Engineering

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Decomposition characteristics of methane hydrate in porous media under continuous and intermittent microwave heating

Cited by 14 publications

References 50 publications

Methane Hydrate Dissociation in Quartz Sand by Depressurization Combined with Microwave Stimulation

Methane Hydrate Dissociation in Quartz Sand by Depressurization Combined with Microwave Stimulation

Enhancing hydrate reservoir temperature by microwave heating: Research on different types of microwave radiation antenna

Structural parameters optimization of microwave radiation antenna in hydrate reservoir based on multiphysical coupling model

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