An approximate approach to estimation of dissociation rate of gas hydrate in porous rock bed
Development of deep shelf or onshore gas hydrate fields involves drilling wells with subsequent thermal, decompression or chemical action on the bed. In this case, the radius of thermal or decompression action is limited. As the field develops, recovery efficiency decreases, and necessity arises for...
| Published in: | E3S Web of Conferences |
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| Main Authors: | , , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English French |
| Published: |
EDP Sciences
2021
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| Subjects: | |
| Online Access: | https://doi.org/10.1051/e3sconf/202123001002 https://www.e3s-conferences.org/articles/e3sconf/pdf/2021/06/e3sconf_ght2020_01002.pdf https://doaj.org/article/2adb11ac175e47abb677c4f0c3ad3ba8 |
| Summary: | Development of deep shelf or onshore gas hydrate fields involves drilling wells with subsequent thermal, decompression or chemical action on the bed. In this case, the radius of thermal or decompression action is limited. As the field develops, recovery efficiency decreases, and necessity arises for drilling a new well that influences the cost of the technology. To determine the rational wells location, it is necessary to predict the advance of the phase transformation rate front into the depth of the bed. In this work, to study the movement dynamics of the gas hydrates dissociation front in a porous layer of rock, the Stefan problem solution is used. The method adequacy is substantiated by comparing the calculated results with known experimental data. The temperature fields are modelled in a porous bed during the methane hydrate dissociation. The temperature field dynamics for 200 days in a porous bed during the methane hydrate dissociation caused by thermal action is shown. The influence of porosity and excess temperature on the dissociation front movement rate is revealed. |
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