Experimental Study of Sand Production during Depressurization Exploitation in Hydrate Silty-Clay Sediments
Silty-clay reservoirs are a weak point in sand production and sand control studies due to their low economy. However, China’s marine natural gas hydrates (NGH) mostly exist in silty-clay sediments, which restrict the sustainable and efficient development of NGH. In order to study the sand...
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| Format: | Article |
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MDPI AG
2019-11-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/12/22/4268 |
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| author | Jingsheng Lu Dongliang Li Yong He Lingli Shi Deqing Liang Youming Xiong |
| author_facet | Jingsheng Lu Dongliang Li Yong He Lingli Shi Deqing Liang Youming Xiong |
| author_sort | Jingsheng Lu |
| collection | DOAJ |
| description | Silty-clay reservoirs are a weak point in sand production and sand control studies due to their low economy. However, China’s marine natural gas hydrates (NGH) mostly exist in silty-clay sediments, which restrict the sustainable and efficient development of NGH. In order to study the sand production of hydrate silty-clay sediments, hydrate production experiments in vertical wells and horizontal wells were carried out using a self-developed hydrate sand production and sand control simulation device. The results showed a great difference between the hydrate silty-clay sediments and hydrate sand sediments. The significant differences in production pressure and production temperature between the different layers indicated the low permeability and low heterogeneity of the hydrate silty-clay sediments. The sliding settlement of the overall depression in the horizontal well and overall subsidence in the vertical well of the hydrate silty-clay reservoir would easily lead to silty-clay flow and large-scale sand production. When water rates decreased, the property of “silty-clay sediment filtration and wall building” was found, which formed a “mud cake” around the wellbore. The good strength of adhesion and fracture permeability of the “mud cake” provided ideas for reservoir reformation. This study further discusses sand production and sediment reformation in hydrate silty-clay sediments. |
| first_indexed | 2024-12-10T08:19:45Z |
| format | Article |
| id | doaj.art-36fc93ad3aba448dbbcf48c06192737f |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-12-10T08:19:45Z |
| publishDate | 2019-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-36fc93ad3aba448dbbcf48c06192737f2022-12-22T01:56:22ZengMDPI AGEnergies1996-10732019-11-011222426810.3390/en12224268en12224268Experimental Study of Sand Production during Depressurization Exploitation in Hydrate Silty-Clay SedimentsJingsheng Lu0Dongliang Li1Yong He2Lingli Shi3Deqing Liang4Youming Xiong5Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, ChinaKey Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, ChinaKey Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, ChinaKey Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, ChinaKey Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, ChinaState Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaSilty-clay reservoirs are a weak point in sand production and sand control studies due to their low economy. However, China’s marine natural gas hydrates (NGH) mostly exist in silty-clay sediments, which restrict the sustainable and efficient development of NGH. In order to study the sand production of hydrate silty-clay sediments, hydrate production experiments in vertical wells and horizontal wells were carried out using a self-developed hydrate sand production and sand control simulation device. The results showed a great difference between the hydrate silty-clay sediments and hydrate sand sediments. The significant differences in production pressure and production temperature between the different layers indicated the low permeability and low heterogeneity of the hydrate silty-clay sediments. The sliding settlement of the overall depression in the horizontal well and overall subsidence in the vertical well of the hydrate silty-clay reservoir would easily lead to silty-clay flow and large-scale sand production. When water rates decreased, the property of “silty-clay sediment filtration and wall building” was found, which formed a “mud cake” around the wellbore. The good strength of adhesion and fracture permeability of the “mud cake” provided ideas for reservoir reformation. This study further discusses sand production and sediment reformation in hydrate silty-clay sediments.https://www.mdpi.com/1996-1073/12/22/4268methane hydratesilty-clay sedimentssand productionexperimentsexploitation |
| spellingShingle | Jingsheng Lu Dongliang Li Yong He Lingli Shi Deqing Liang Youming Xiong Experimental Study of Sand Production during Depressurization Exploitation in Hydrate Silty-Clay Sediments Energies methane hydrate silty-clay sediments sand production experiments exploitation |
| title | Experimental Study of Sand Production during Depressurization Exploitation in Hydrate Silty-Clay Sediments |
| title_full | Experimental Study of Sand Production during Depressurization Exploitation in Hydrate Silty-Clay Sediments |
| title_fullStr | Experimental Study of Sand Production during Depressurization Exploitation in Hydrate Silty-Clay Sediments |
| title_full_unstemmed | Experimental Study of Sand Production during Depressurization Exploitation in Hydrate Silty-Clay Sediments |
| title_short | Experimental Study of Sand Production during Depressurization Exploitation in Hydrate Silty-Clay Sediments |
| title_sort | experimental study of sand production during depressurization exploitation in hydrate silty clay sediments |
| topic | methane hydrate silty-clay sediments sand production experiments exploitation |
| url | https://www.mdpi.com/1996-1073/12/22/4268 |
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