Knowledge Management System Of Guangzhou Institute of Energy Conversion, CAS
Microscopic measurements on the decomposition behaviour of methane hydrates formed in natural sands | |
Wen, Long1,2,3; Zhou, Xuebing1,2; Liang, Deqing1,2 | |
2019 | |
发表期刊 | RSC ADVANCES |
ISSN | 2046-2069 |
卷号 | 9期号:26页码:14727-14735 |
通讯作者 | Liang, Deqing(liangdq@ms.giec.ac.cn) |
摘要 | In this work, the decomposition behaviour of methane hydrate in porous media was investigated microscopically using powder X-ray diffraction, cryogenic scanning electron microscopy and in situ Raman spectroscopy. The effect of grain sizes on the decomposition of methane hydrate was measured. The results showed that bulk hydrates could exist stably at 223 K and atmospheric pressure because of the self-preservation effect. However, hydrate formed in sands was relatively easier to decompose because it had a higher equilibrium pressure compared with bulk hydrate at the same temperature. In this case, there would be a higher decomposition driving force. Interestingly, the complete decomposition time for hydrate formed in sands did not decrease with the decrease in particle size. The shortest decomposition time was observed for the sands with the particle size range of 38-55 m, which was less than 30 minutes. Moreover methane hydrate was found to decompose faster in the porous medium containing 3.5 wt% NaCl, which suggested that there was almost no self-preservation effect. In situ Raman measurements showed that the integrated intensity ratio of methane in large and small cages (A(L)/A(S)) did not change during the decomposition process, suggesting that the methane hydrate crystal units decomposed as an entity in sands. This study provided important data as a basis for drilling fluid technology in hydrate mining. |
DOI | 10.1039/c9ra01611b |
关键词[WOS] | MOLECULAR-DYNAMICS SIMULATIONS ; STRATIGRAPHIC TEST WELL ; CARBON-DIOXIDE ; NUMERICAL-ANALYSIS ; PARTICLE SIZES ; POROUS-MEDIA ; DISSOCIATION ; PERMEABILITY ; SEDIMENTS ; CORES |
收录类别 | SCI |
语种 | 英语 |
资助项目 | National Natural Science Foundation of China[41603062] ; National Key Research and Development Plan of China[2016YFC0304002] |
WOS研究方向 | Chemistry |
项目资助者 | National Natural Science Foundation of China ; National Key Research and Development Plan of China |
WOS类目 | Chemistry, Multidisciplinary |
WOS记录号 | WOS:000468641300019 |
出版者 | ROYAL SOC CHEMISTRY |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.giec.ac.cn/handle/344007/25189 |
通讯作者 | Liang, Deqing |
作者单位 | 1.Chinese Acad Sci, CAS Key Lab Gas Hydrate, Guangzhou Inst Energy Convers, Guangzhou Ctr Gas Hydrate Res, Guangzhou 510640, Guangdong, Peoples R China 2.Guangdong Prov Key Lab New & Renewable Energy Res, Guangzhou 510640, Guangdong, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
推荐引用方式 GB/T 7714 | Wen, Long,Zhou, Xuebing,Liang, Deqing. Microscopic measurements on the decomposition behaviour of methane hydrates formed in natural sands[J]. RSC ADVANCES,2019,9(26):14727-14735. |
APA | Wen, Long,Zhou, Xuebing,&Liang, Deqing.(2019).Microscopic measurements on the decomposition behaviour of methane hydrates formed in natural sands.RSC ADVANCES,9(26),14727-14735. |
MLA | Wen, Long,et al."Microscopic measurements on the decomposition behaviour of methane hydrates formed in natural sands".RSC ADVANCES 9.26(2019):14727-14735. |
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