采空区对CO2置换开采海域天然气水合物置换效果影响的实验研究 |
投稿时间:2021-10-14 修订日期:2022-01-08 点此下载全文 |
引用本文:李子涵,潘栋彬,陈晨,等.采空区对CO2置换开采海域天然气水合物置换效果影响的实验研究[J].钻探工程,2022,49(1):88-95.LI Zihan,PAN Dongbin,CHEN Chen,et al. Influence of mined-out areas on the replacement performance of marine gas hydrate CO2 replacement mining[J]. Drilling Engineering, 2022,49(1):88-95. |
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基金项目:国家自然科学基金项目“高压低温水射流作用下海底天然气水合物储层破岩过程与机理研究”(编号:41672361);吉林省科技厅国际合作项目“海洋天然气水合物置换开采关键技术研究”(编号:20170414044GH) |
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中文摘要:为揭示固体开采形成的采空区对CO2置换开采天然气水合物置换效果的影响,开展了含采空区储层与完整储层的CO2/N2置换开采不同天然气水合物饱和度对比实验研究。结果表明:对于水合物饱和度分别为30%和45%的试样,含采空区储层较完整储层的CH4置换率分别提高了5.5%和9%,单位体积CO2封存量分别提高了26.5%和39.8%。采空区的存在提高了置换介质与天然气水合物的摩尔比率,从而提供了更高的置换驱动力;且在较高水合物饱和度试样中采空区还会提高置换介质的扩散作用,导致含采空区储层的置换效果好于完整储层。因此,在固体开采后进一步进行CO2置换开采,可以提高置换开采效率,同时有助于碳封存与地层稳定,是一种潜在的海域天然气水合物安全、绿色开采模式。 |
中文关键词:海域天然气水合物 采空区 CH4置换率 CO2封存 |
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Influence of mined-out areas on the replacement performance of marine gas hydrate CO2 replacement mining |
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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. |
keywords:marine gas hydrate mined-out area CH4 replacement rate CO2 storage |
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