Effect of clay on methane hydrate formation and dissociation in sediment: Implications for energy recovery from clayey-sandy hydrate reservoirs*
文献类型：期刊论文
| 作者 | Liu, Zheng1,2; Zheng, Junjie2; Wang, Zhiyuan1; Gao, Yonghai1; Sun, Baojiang1; Liao, Youqiang3; Linga, Praveen2 |
| 刊名 | APPLIED ENERGY
 |
| 出版日期 | 2023-07-01 |
| 卷号 | 341期号:-页码:- |
| ISSN号 | 0306-2619 |
| 关键词 | Natural gas hydrate Clayey-sandy sediments Hydrate-bearing sediment synthesis Water-excess method Depressurization Fluid production performance |
| 英文摘要 | Natural gas hydrate (NGH) is an unconventional energy source with high energy density, huge reserves and worldwide distribution. Sand-dominated hydrate-bearing sediments (HBS) are believed to be the most economically and technically feasible category of HBS for exploitation. Clay is one major mineral component of the natural HBS apart from sands. Due to the inhibition effect of clay on thermodynamics and kinetics of hydrate formation, it is challenging to synthesize representative clayey-sandy HBS samples in laboratory, and thus the corresponding fluid production behavior remains poorly understood. In this study, a sample synthesis method dedicated to clayey-sandy HBS (20 wt% clay) was developed. Two synergistic strategies including pre-wetting and multiple-site water injection were employed to enhance hydrate formation kinetics, increasing the final hydrate saturation from 0.285 to 0.473. Water-rich clayey-sandy HBS samples were formed with no dry sediment zones and improved hydrate distribution homogeneity. This optimized HBS synthesis method fills the gap be-tween the conventional HBS synthesis methods and the need to form more representative clayey-sandy HBS samples. Energy recovery and fluid production from sandy and clayey-sandy HBS samples were investigated by depressurizing to 3.0 MPa at 6.0 degrees C. Unique features were observed for hydrate dissociation in clayey-sandy HBS: immediate hydrate decomposition upon depressurization and a great pressure difference (similar to 1.0 MPa) between sediment and wellbore during the production period. This pressure gradient, likely caused by the aggregation and clogging of clays near the wellbore, slowed hydrate decomposition compared to sandy HBS. Additionally, the gas recovery increased from 81.7% to 88.5%, whereas the water recovery substantially decreased from 25.3% to 8.1%. The significant difference in fluid production behavior between clayey-sandy HBS and sandy HBS calls for more thorough investigations into clay-containing HBS to develop specific production strategies for energy re-covery from this type of HBS. |
| 学科主题 | Energy & Fuels ; Engineering |
| 语种 | 英语 |
| 出版者 | ELSEVIER SCI LTD |
| WOS记录号 | WOS:000981069000001 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35198]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.State Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China 2.Department of Chemical and Biomolecular Engineering, National University of Singapore, 117582, Singapore 3.Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
| 推荐引用方式 GB/T 7714 | Liu, Zheng,Zheng, Junjie,Wang, Zhiyuan,et al. Effect of clay on methane hydrate formation and dissociation in sediment: Implications for energy recovery from clayey-sandy hydrate reservoirs*[J]. APPLIED ENERGY,2023,341(-):-. |
| APA | Liu, Zheng.,Zheng, Junjie.,Wang, Zhiyuan.,Gao, Yonghai.,Sun, Baojiang.,...&Linga, Praveen.(2023).Effect of clay on methane hydrate formation and dissociation in sediment: Implications for energy recovery from clayey-sandy hydrate reservoirs*.APPLIED ENERGY,341(-),-. |
| MLA | Liu, Zheng,et al."Effect of clay on methane hydrate formation and dissociation in sediment: Implications for energy recovery from clayey-sandy hydrate reservoirs*".APPLIED ENERGY 341.-(2023):-. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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