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Kuang Y, Zhang L, Song Y, Yang L, Zhao J. Quantitative determination of pore‐structure change and permeability estimation under hydrate phase transition by NMR. AIChE J 2019. [DOI: 10.1002/aic.16859] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yangmin Kuang
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of EducationDalian University of Technology Dalian China
| | - Lunxiang Zhang
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of EducationDalian University of Technology Dalian China
| | - Yongchen Song
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of EducationDalian University of Technology Dalian China
| | - Lei Yang
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of EducationDalian University of Technology Dalian China
| | - Jiafei Zhao
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of EducationDalian University of Technology Dalian China
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Zhang L, Sun M, Sun L, Yu T, Song Y, Zhao J, Yang L, Dong H. In-situ observation for natural gas hydrate in porous medium: Water performance and formation characteristic. Magn Reson Imaging 2019; 65:166-174. [PMID: 31734447 DOI: 10.1016/j.mri.2019.09.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 08/27/2019] [Accepted: 09/15/2019] [Indexed: 12/01/2022]
Abstract
Extensive efforts have been made regarding gas hydrate sample reconstruction in the laboratory for a better understanding and development of natural gas resources. Magnetic resonance imaging (MRI) is a useful method for directly observing the reconstruction of methane hydrate, yet relevant studies remain limited. In this study, a 9.4-T 400-MHz MRI instrument was employed to investigate CH4 hydrate formation in porous media involving various initial water saturation levels and sand diameters. Pressure histories and MRI signal variations were monitored to discuss the process of CH4 hydrate growth, and the three main formation stages of induction, rapid growth, and slow formation were determined. Furthermore, the liquid water performance in MRI micro-images was analyzed to predict the characteristics of CH4 hydrate formation. The results indicated that CH4 hydrate formed in a spatially and temporally random manner and that pore plugging occurred owing to the residual water encased in grown hydrate. Additionally, phase saturations, water conversion percentages, and formation rates were defined to evaluate the effect of sand diameter and initial water saturation on CH4 hydrate formation. With the reduction in the diameter of quartz glass beads from 400 μm to 100 μm, the average hydrate formation rate increased from 0.0010 min-1 to 0.0034 min-1, respectively. When the initial water saturation decreased to the optimized value (0.22 in this study), the water conversion percentage and hydrate saturation increased.
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Affiliation(s)
- Lunxiang Zhang
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
| | - Mingrui Sun
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
| | - Lingjie Sun
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
| | - Tao Yu
- Graduate School of Science and Technology, Hirosaki University, 1-Bunkyocho, Hirosaki 036-8560, Japan
| | - Yongchen Song
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
| | - Jiafei Zhao
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China.
| | - Lei Yang
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
| | - Hongsheng Dong
- Thermochemistry Laboratory, Liaoning Province Key Laboratory of Thermochemistry for Energy and Materials, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
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Yang M, Ma Z, Gao Y, Jiang L. Dissociation characteristics of methane hydrate using depressurization combined with thermal stimulation. Chin J Chem Eng 2019. [DOI: 10.1016/j.cjche.2019.02.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Advances of experimental study on gas production from synthetic hydrate reservoir in China. Chin J Chem Eng 2019. [DOI: 10.1016/j.cjche.2019.02.036] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Zhang L, Sun L, Sun M, Lv X, Dong H, Miao Y, Yang L, Song Y, Zhao J. Analyzing spatially and temporally visualized formation behavior of methane hydrate in unconsolidated porous media. Magn Reson Imaging 2019; 61:224-230. [PMID: 31170430 DOI: 10.1016/j.mri.2019.06.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Revised: 05/28/2019] [Accepted: 06/02/2019] [Indexed: 11/30/2022]
Abstract
An understanding of the nucleation and growth mechanism of methane hydrate in porous space is essential for exploitation and application of hydrates, but the mechanism is yet to be clarified. Magnetic resonance imaging (MRI) was employed to visually analyze the spatial and temporal formation behavior of methane hydrate in a porous media. Detailed information about the water distribution, initial nucleation sites, and hydrate growth was obtained, in addition to MRI images. The results demonstrated that the water molecules distributed in the vertical direction preferred the middle slice of a porous medium sample, and the decrease in the number of molecules in the middle slice and on both sides of the slice was similar during hydrate formation. The formation process are quite different in selected horizontal slices, which were contributed to the various distribution of water and gas in pore spaces and the randomness of methane hydrate formation. The extension of these predicted results could have important implications for optimizing the formation processes of gas hydrate in hydrate-based technologies.
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Affiliation(s)
- Lunxiang Zhang
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
| | - Lingjie Sun
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
| | - Mingrui Sun
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
| | - Xin Lv
- CNOOC Research Institute, Beijing 100027, China
| | - Hongsheng Dong
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
| | - Yang Miao
- Xingang Shipbuilding Heavy Industry Co., Ltd., Tianjin 300452, China
| | - Lei Yang
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
| | - Yongchen Song
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China
| | - Jiafei Zhao
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China.
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Comparison and Optimization of Methane Hydrate Production Process Using Different Methods in a Single Vertical Well. ENERGIES 2018. [DOI: 10.3390/en12010124] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Natural gas hydrate (NGH) is a potential type of clean and efficient energy that is widely distributed in the ocean and permafrost, and most of the present researches are mainly focused on finding out efficient exploitation methods. Taking the effects of natural gas productivity and extraction time into account, one of the exploitation methods that are most commonly investigated is depressurization combined with thermal stimulation. However, few studies considered the effect of different mining methods on NGH production in vertical wells, especially aiming at the in-situ electric heating without mass injection and the comparison of production efficiency in different modes. Considering the current research status, four exploitation methods which are pure depressurization (PD), pure heating (PH), simultaneous depressurization combined with electric heating (SDH) and huff and puff (H&P) were carried out in this paper to study the influences of different production methods on NGH exploitation in a vertical well. Some parameters such as gas production (VP), water production (CP) and the energy efficiency (η) were investigated to evaluate the production performance of these methods. The results suggest that the temperature in the reactor is affected by the exploitation methods as well as the water production during exploitation. For PD, although it has no extra energy consumption, the longest production period is seen in it due to the insufficient pressure driving force. On the contrary, the NGH cannot be completely exploited only triggered by heating driving force with PH method. So there is a limited decomposition effect with it. Taking the gas production time, the VP, and the NGH dissociation rate into account, the production effects of SDH are more beneficial than other methods as the dual decomposition driving force was adopted in it. Furthermore, a reasonable heating power can result in a better production performance. On the other hand, promoted by pressure difference and discontinuous heating, H&P shows its obvious advantage in shortening production duration and improving energy efficiency, which is therefore believed to have the best commercial exploitation value among the four methods.
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Zhang L, Kuang Y, Zhang X, Song Y, Liu Y, Zhao J. Analyzing the Process of Gas Production from Methane Hydrate via Nitrogen Injection. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b01011] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lunxiang Zhang
- School
of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, P. R. China
| | - Yangmin Kuang
- School
of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, P. R. China
| | - Xiaotong Zhang
- Interdisciplinary
Institute of Neuroscience and Technology, Zhejiang University, Hangzhou 310029, P. R. China
- College of Biomedical Engineering & Instrument Science, Zhejiang University, Hangzhou 310029, P. R. China
| | - Yongchen Song
- School
of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, P. R. China
| | - Yu Liu
- School
of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, P. R. China
| | - Jiafei Zhao
- School
of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, P. R. China
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Fan Z, Sun C, Kuang Y, Wang B, Zhao J, Song Y. MRI Analysis for Methane Hydrate Dissociation by Depressurization and the Concomitant Ice Generation. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.egypro.2017.03.1038] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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12
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Numerical Investigation of the Production Behavior of Methane Hydrates under Depressurization Conditions Combined with Well-Wall Heating. ENERGIES 2017. [DOI: 10.3390/en10020161] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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