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Home > Archive>Volume 49, Issue 1, 2022 >88-95. DOI:10.12143/j.ztgc.2022.01.012
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Influence of mined-out areas on the replacement performance of marine gas hydrate CO2 replacement mining
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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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TE53

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    Abstract:

    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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