A Thermodynamic Method for the Estimation of Free Gas Proportion in Depressurization Production of Natural Gas Hydrate
Free gas saturation is one of the key factors that affect the overall production behaviors of hydrate reservoirs. For example, different free gas contents could alter the thermal response of hydrate reservoirs to the artificial stimulation and hence change the gas production performance. To investig...
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Frontiers Media S.A.
2022-03-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.859111/full |
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| author | Shouding Li Shouding Li Shouding Li Yiming Sun Yiming Sun Yiming Sun Cheng Lu Cheng Lu Weichang Chen Weichang Chen Weichang Chen Shimin Liu Lin Chen Lin Chen Xiao Li Xiao Li Xiao Li |
| author_facet | Shouding Li Shouding Li Shouding Li Yiming Sun Yiming Sun Yiming Sun Cheng Lu Cheng Lu Weichang Chen Weichang Chen Weichang Chen Shimin Liu Lin Chen Lin Chen Xiao Li Xiao Li Xiao Li |
| author_sort | Shouding Li |
| collection | DOAJ |
| description | Free gas saturation is one of the key factors that affect the overall production behaviors of hydrate reservoirs. For example, different free gas contents could alter the thermal response of hydrate reservoirs to the artificial stimulation and hence change the gas production performance. To investigate whether and how much the hydrate reservoir contains free gas, we proposed a thermodynamic method to calculate the total heat consumption of hydrate dissociation throughout gas production and assess the free gas proportion. Based on the monitoring data of the first offshore hydrate production in Japan, we calculated the total heat consumption and analyzed the contributions of heat convection, heat conduction, and sensible heat during the entire test. The calculation results showed that there is likely to be a certain amount of free gas in the hydrate reservoir in the Eastern Nankai Trough. In addition, the analysis of different heat sources revealed the critical thermodynamic phenomenon in which the reservoir sensible heat was the main source for enthalpy of hydrate dissociation, which consistently contributed more than 95% of the total heat supply during the 6-day production test. The results of this work may help upgrade the production strategy for natural gas hydrates. |
| first_indexed | 2024-04-12T18:51:37Z |
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| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-12T18:51:37Z |
| publishDate | 2022-03-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Earth Science |
| spelling | doaj.art-0c2d2f955aa94bf6a9948e7afcc08c5a2022-12-22T03:20:27ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632022-03-011010.3389/feart.2022.859111859111A Thermodynamic Method for the Estimation of Free Gas Proportion in Depressurization Production of Natural Gas HydrateShouding Li0Shouding Li1Shouding Li2Yiming Sun3Yiming Sun4Yiming Sun5Cheng Lu6Cheng Lu7Weichang Chen8Weichang Chen9Weichang Chen10Shimin Liu11Lin Chen12Lin Chen13Xiao Li14Xiao Li15Xiao Li16Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, ChinaInnovation Academy for Earth Science, Chinese Academy of Sciences, Beijing, ChinaCollege of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, ChinaKey Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, ChinaInnovation Academy for Earth Science, Chinese Academy of Sciences, Beijing, ChinaCollege of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, ChinaGuangzhou Marine Geological Survey, China Geological Survey, Guangzhou, ChinaCenter of Oil and Natural Gas Resource Exploration, China Geological Survey, Beijing, ChinaKey Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, ChinaInnovation Academy for Earth Science, Chinese Academy of Sciences, Beijing, ChinaCollege of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, ChinaDepartment of Energy and Mineral Engineering, G3 Center and Energy Institute, The Pennsylvania State University, University Park, State College, PA, United StatesInstitute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, ChinaSchool of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing, ChinaKey Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, ChinaInnovation Academy for Earth Science, Chinese Academy of Sciences, Beijing, ChinaCollege of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, ChinaFree gas saturation is one of the key factors that affect the overall production behaviors of hydrate reservoirs. For example, different free gas contents could alter the thermal response of hydrate reservoirs to the artificial stimulation and hence change the gas production performance. To investigate whether and how much the hydrate reservoir contains free gas, we proposed a thermodynamic method to calculate the total heat consumption of hydrate dissociation throughout gas production and assess the free gas proportion. Based on the monitoring data of the first offshore hydrate production in Japan, we calculated the total heat consumption and analyzed the contributions of heat convection, heat conduction, and sensible heat during the entire test. The calculation results showed that there is likely to be a certain amount of free gas in the hydrate reservoir in the Eastern Nankai Trough. In addition, the analysis of different heat sources revealed the critical thermodynamic phenomenon in which the reservoir sensible heat was the main source for enthalpy of hydrate dissociation, which consistently contributed more than 95% of the total heat supply during the 6-day production test. The results of this work may help upgrade the production strategy for natural gas hydrates.https://www.frontiersin.org/articles/10.3389/feart.2022.859111/fullnatural gas hydratefree gas proportionthermodynamic analysisheat transferhydrate production |
| spellingShingle | Shouding Li Shouding Li Shouding Li Yiming Sun Yiming Sun Yiming Sun Cheng Lu Cheng Lu Weichang Chen Weichang Chen Weichang Chen Shimin Liu Lin Chen Lin Chen Xiao Li Xiao Li Xiao Li A Thermodynamic Method for the Estimation of Free Gas Proportion in Depressurization Production of Natural Gas Hydrate Frontiers in Earth Science natural gas hydrate free gas proportion thermodynamic analysis heat transfer hydrate production |
| title | A Thermodynamic Method for the Estimation of Free Gas Proportion in Depressurization Production of Natural Gas Hydrate |
| title_full | A Thermodynamic Method for the Estimation of Free Gas Proportion in Depressurization Production of Natural Gas Hydrate |
| title_fullStr | A Thermodynamic Method for the Estimation of Free Gas Proportion in Depressurization Production of Natural Gas Hydrate |
| title_full_unstemmed | A Thermodynamic Method for the Estimation of Free Gas Proportion in Depressurization Production of Natural Gas Hydrate |
| title_short | A Thermodynamic Method for the Estimation of Free Gas Proportion in Depressurization Production of Natural Gas Hydrate |
| title_sort | thermodynamic method for the estimation of free gas proportion in depressurization production of natural gas hydrate |
| topic | natural gas hydrate free gas proportion thermodynamic analysis heat transfer hydrate production |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.859111/full |
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