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Article

The Study of Flow Characteristics During the Decomposition Process in Hydrate-Bearing Porous Media Using Magnetic Resonance Imaging

1
Key Laboratory of Solidification Control and Digital Preparation Technology, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
2
Key Laboratory of Ocean Energy Utilization and Energy Conversion of Ministry of Education, Dalian University of Technology, Dalian 116024, China
*
Authors to whom correspondence should be addressed.
Energies 2019, 12(9), 1736; https://doi.org/10.3390/en12091736
Received: 10 March 2019 / Revised: 5 May 2019 / Accepted: 6 May 2019 / Published: 8 May 2019
(This article belongs to the Special Issue Advances in Natural Gas Hydrates)
The flow characteristics during decomposition of hydrate-bearing sediments are the most critical parameters for the gas recovery potential from natural gas hydrate reservoirs. The absolute and relative permeability and the flow field distribution during the decomposition process of hydrate-bearing porous media synthetically created by glass beads are in-situ measured by using magnetic resonance imaging. The absolute permeability value increased slowly, then became stable after the decomposition amount was 50%. The relative permeability change curve is a typical X-shaped cross curve. As the hydrate decomposed, the relative permeability values of the two phases increased, the range of the two-phase co-infiltration zone increased with the increase of relative permeability at the endpoint, and the coexistence water saturation decreased. At the beginning of the decomposition, (hydrate content 100% to 70%), the relative permeability of methane and water rose rapidly from 22% to 51% and from 58% to 70%, respectively. When the amount of the remaining hydrate was less than 50%, the relative permeability curve of the hydrate-bearing glass beads almost kept unchanged. During the hydrate decomposition process, the velocity distribution was very uneven and coincided with the porous media structure. View Full-Text
Keywords: hydrate; flow characteristics; absolute permeability; relative permeability; flow field distribution; decomposition; hydrate-bearing sediments hydrate; flow characteristics; absolute permeability; relative permeability; flow field distribution; decomposition; hydrate-bearing sediments
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MDPI and ACS Style

Xue, K.; Yang, L.; Zhao, J.; Li, Y.; Song, Y.; Yao, S. The Study of Flow Characteristics During the Decomposition Process in Hydrate-Bearing Porous Media Using Magnetic Resonance Imaging. Energies 2019, 12, 1736. https://doi.org/10.3390/en12091736

AMA Style

Xue K, Yang L, Zhao J, Li Y, Song Y, Yao S. The Study of Flow Characteristics During the Decomposition Process in Hydrate-Bearing Porous Media Using Magnetic Resonance Imaging. Energies. 2019; 12(9):1736. https://doi.org/10.3390/en12091736

Chicago/Turabian Style

Xue, Kaihua, Lei Yang, Jiafei Zhao, Yanghui Li, Yongchen Song, and Shan Yao. 2019. "The Study of Flow Characteristics During the Decomposition Process in Hydrate-Bearing Porous Media Using Magnetic Resonance Imaging" Energies 12, no. 9: 1736. https://doi.org/10.3390/en12091736

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