- LI Zihan 1,2
LI Zihan
College of Construction Engineering， Jilin University， Changchun Jilin 130026， China;Key Laboratory of Drilling and Exploitation Technology in Complex Conditions;of Ministry of Natural Resources，Changchun Jilin 130026， China
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Search for this author on this site - PAN Dongbin 3
PAN Dongbin
College of Resource and Environment Engineering， Jiangxi University;of Science and Technology， Ganzhou Jiangxi 341000， China
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Search for this author on this site - CHEN Chen 1,2
CHEN Chen
College of Construction Engineering， Jilin University， Changchun Jilin 130026， China;Key Laboratory of Drilling and Exploitation Technology in Complex Conditions;of Ministry of Natural Resources，Changchun Jilin 130026， China
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Search for this author on this site - ZHONG Xiuping 1,2
ZHONG Xiuping
College of Construction Engineering， Jilin University， Changchun Jilin 130026， China;Key Laboratory of Drilling and Exploitation Technology in Complex Conditions;of Ministry of Natural Resources，Changchun Jilin 130026， China
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Search for this author on this site - NIE Shuaishuai 1,2
NIE Shuaishuai
College of Construction Engineering， Jilin University， Changchun Jilin 130026， China;Key Laboratory of Drilling and Exploitation Technology in Complex Conditions;of Ministry of Natural Resources，Changchun Jilin 130026， China
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Search for this author on this site - MA Yingrui 1,2
MA Yingrui
College of Construction Engineering， Jilin University， Changchun Jilin 130026， China;Key Laboratory of Drilling and Exploitation Technology in Complex Conditions;of Ministry of Natural Resources，Changchun Jilin 130026， China
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Search for this author on this site - MENG Yilong 1,2
MENG Yilong
College of Construction Engineering， Jilin University， Changchun Jilin 130026， China;Key Laboratory of Drilling and Exploitation Technology in Complex Conditions;of Ministry of Natural Resources，Changchun Jilin 130026， China
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1.College of Construction Engineering， Jilin University， Changchun Jilin 130026， China;2.Key Laboratory of Drilling and Exploitation Technology in Complex Conditions;of Ministry of Natural Resources，Changchun Jilin 130026， China;3.College of Resource and Environment Engineering， Jiangxi University;of Science and Technology， Ganzhou Jiangxi 341000， China
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In order to reveal the influence of mined-out areas formed by solid mining on replacement performance of gas hydrate CO2 replacement mining， the comparative experimental study on CO2/N2 replacement mining of different gas hydrate saturations in mined-out area reservoirs and intact reservoirs was carried out. The results show that for the samples each with hydrate saturation of 30% and 45%， the CH4 replacement rate of the mined-out area-reservoir is 5.5% and 9% higher than that of the intact reservoir， and the CO2 storage per unit volume is increased by 26.5% and 39.8%， respectively. The existence of mined-out areas increases the molar ratio of the replacement medium to gas hydrate， thus providing a higher replacement driving force. Moreover， in the samples with high hydrate saturation， the mined-out area will also improve the diffusion of the replacement medium， resulting in the greater replacement effect of the reservoir containing mined-out area over the intact reservoir. Therefore， CO2 replacement mining after solid mining can improve replacement mining efficiency， and contribute to carbon sequestration and formation stability. It is a potential safe and green mining mode for marine hydrate.
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History
- Received:October 14,2021
- Revised:January 08,2022
- Adopted:January 09,2022
- Online: February 11,2022
- Published: January 10,2022
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