Radially Symmetrical Heat Hydrate Dissociation Model with a Density Difference

Qian Wang, Hairong Lian (), Wanjing Luo, Bailu Teng (), Xinyu Fang and Gang Yao
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Qian Wang: School of Science, China University of Geosciences (Beijing), Beijing 100083, China
Hairong Lian: School of Science, China University of Geosciences (Beijing), Beijing 100083, China
Wanjing Luo: School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
Bailu Teng: School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
Xinyu Fang: State Key Laboratory of Petroleum Resources and Prospecting, Unconventional Petroleum Research Institute, China University of Petroleum (Beijing), Beijing 102249, China
Gang Yao: State Key Laboratory of Petroleum Resources and Prospecting, Unconventional Petroleum Research Institute, China University of Petroleum (Beijing), Beijing 102249, China

Energies, 2022, vol. 15, issue 22, 1-11

Abstract: The hydrate dissociation is viewed as a phase change process in which hydrates transform from a solid phase into gas and liquid phase at a moving dissociation boundary. The boundary separates the dissociation zone containing gas and water from the undissociated zone containing the hydrates, leading to a density difference. Based on the assumption of a density difference between the dissociation zone and the hydrate zone, the authors propose a mathematical model to study hydrate dissociation under thermal stimulation in an infinite radially symmetrical reservoir. Analytical solutions to the temperature distribution are derived by using the self-similarity transformation. Considering the effect factors of the initial heated-water temperature and hydrate density, the authors conducted a thorough investigation of the temperature distribution and the location of the dissociation front for a sample hydrate reservoir. The results from our model show that the heated-water temperature and hydrate density exert significant influence on the hydrate dissociation. With the injection time unchanged, the dissociation distance tends to be increased as the heated-water temperature is increased, leading to a larger dissociation zone. Additionally, a smaller hydrate density can result in a larger dissociation distance. For hydrate thermal stimulation, a higher heated-water temperature and a lower hydrate density can lead to a larger dissociation distance with the injection time unchanged. As the hydrate dissociation proceeds, the dissociation rate is decreased.

Keywords: hydrate dissociation; radially symmetrical; heat conduction; density difference; moving boundary (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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