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methane hydrate formation in porous media:Overview and perspectives

Journal of Energy Chemistry 2022年第11期31卷 454-480,I0012页

作者： Yue Qin Liyan Shang Zhenbo Lv Jianyu He Xu Yang Zhien Zhang College of Petroleum Engineering Liaoning Petrochemical UniversityFushun 113001LiaoningChina School of Environmental&Safety Engineering Liaoning Petrochemical UniversityFushun 113001LiaoningChina College of Petroleum and Chemical Engineering Liaoning Petrochemical UniversityFushun 113001LiaoningChina School of Computer Science Shenyang Aerospace UniversityShenyang 110135LiaoningChina Department of Chemical and Biomedical Engineering West Virginia UniversityMorgantownWV 26506United States

Natural gas hydrate(NGH)has recently received more attention as a cleaner alternative energy source that not only reduces carbon emissions caused by the use of conventional fossil fuels but also plays a key role in global climate ***,hydrate-based technologies,particularly hydrate-based carbon capture and storage,have enormous promise for decreasing global carbon emissions,and porous media play an important role in all hydrate-based ***,this paper reviews the recent applications of porous media in the field of methane hydrate(MH)formation and analyzes the influence of porous media systems on MH phase equilibria and formation *** is because the efficiency of hydrate-based technologies is determined mainly by the phase equilibrium and formation kinetics of *** influence of the nature of the media on MH formation in porous media systems is comprehensively summarized to understand how porous media can efficiently enhance the kinetics of hydrate *** are necessary for rapid hydrate formation,and the effect of various promoters on MH formation was also *** on the aforementioned overview and understanding,the mechanisms for MH formation in various porous media systems are ***,the future perspectives and challenges of hydrate-based technologies in tackling global climate change were *** review provides a fundamental understanding of the application and development of porous media in rapid hydrate formation,a fair evaluation of the performance of various porous media systems,and critical insights into major research foci.

关键词： methane hydrate Porous media Phase equilibrium Kinetics Carbon neutrality

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methane hydrate formation and dissociation in synthetic seawater

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Journal of Natural Gas Chemistry 2012年第6期21卷 625-632页

作者： Vikash Kumar Saw Iqbal Ahmad Ajay Mandal G.Udayabhanu Sukumar Laik Gas hydrate Laboratory Department of Petroleum Engineering Department of Applied Chemistry Indian School of Mines

The formation and dissociation of methane gas hydrate at an interface between synthetic seawater （SSW） and methane gas have been experimentally investigated in the present work. The amount of gas consumed during hydrate formation has been calculated using the real gas equation. Induction time for the formation of hydrate is found to depend on the degree of subcooling. All the experiments were conducted in quiescent system with initial cell pressure of 11.14 MPa. Salinity effects on the onset pressure and temperature of hydrate formation are also observed. The dissociation enthalpies of methane hydrate in synthetic seawater were determined by Clausius-Clapeyron equation based on the measured phase equilibrium data. The dissociation data have been analyzed by existing models and compared with the reported data.

关键词： methane hydrate formation and dissociation total dissolved salt induction time subcooling

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Investigation of the methane hydrate surface area during depressurization-induced dissociation in hydrate-bearing porous media

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Chinese Journal of Chemical Engineering 2021年第4期34卷 324-334页

作者： Xuke Ruan Xiao-Sen Li Guangzhou Institute of Energy Conversion Chinese Academy of SciencesGuangzhou 510640China CAS Key Laboratory of Gas hydrate Guangzhou 510640China

The surface area of hydrate during dissociation in porous media is essentially important for the kinetics of hydrate *** this study,the methane hydrate surface area was investigated by the comparison results of experiments and numerical simulations during hydrate decomposition in porous *** experiments of methane hydrate depressurizationinduced dissociation were performed in a 1D high pressure cell filled with glass beads,an improved and valid 1D corescale numerical model was developed to simulate gas *** conceptual models for hydrate dissociation surface area were proposed based on the morphology of hydrate in porous media,which formed the functional form of the hydrate dissociation surface area with porosity,hydrate saturation and the average radius of sand sediment *** the establishment of numerical model for depressurizationinduced hydrate dissociation in porous media,the cumulative gas productions were modeling and compared with the experimental data at the different hydrate *** results indicated that the proposed prediction equations are valid for the hydrate dissociation surface area,and the graincoating surface area model performs well at lower hydrate saturation for hydrate dissociation simulation,whereas at higher hydrate saturation,the hydrate dissociation simulation from the porefilling surface area model is more ***,the sensitivity analysis showed that the hydrate dissociation surface area has a significant impact on the cumulative gas production.

关键词： Surface area methane hydrate hydrate dissociation hydrate morphology Depressurization

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A covering liquid method to intensify self-preservation effect for safety of methane hydrate storage and transportation

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Petroleum Science 2022年第3期19卷 1411-1419页

作者： Jun Chen Yao-Song Zeng Xing-Yu Yu Qing Yuan Tao Wang Bin Deng Ke-Le Yan Jian-Hong Jiang Li-Ming Tao Chang-Zhong Chen Hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds and Applications College of Chemistry and Environmental ScienceXiangnan UniversityChenzhouHunan Province423000China School of Chemistry and Chemical Engineering Liaocheng UniversityLiaocheng252059China SINOPEC Research Institute of Safety Engineering 339 Songling RoadQingdao266000China

In this work,experiments and comprehensive insights into the proposed covering liquid method to intensify self-preservation effect for methane(CH_(4))storage are *** CH_(4)hydrate decomposition percentage was 17.6%with the pressure of 0.61 MPa after 12 h at 266.0 K without a covering liquid,which can be reduced to 12.4%,13.8%,13.0%,and 8.3%with the pressure of 0.26 MPa,0.33 MPa,0.51 MPa,and 0.37 MPa by covering with tetrahydrofuran(THF),cyclopentane(CP),cyclohexane,and n-tetradecane,*** the temperature for CH_(4)hydrate decompositionwas 274.2 K,covering with THF,CP,cyclohexane,and n-tetradecane failed to inhibit CH_(4)hydrate *** results suggested that the covering liquid may form a new solid layer(a hydrate layer or other solidified layer)around the CH_(4)hydrate,which inhibit CH_(4)transfer below the freezing point of ***,the new solid layer cannot resist the fast transfer of CH_(4)from decomposed CH_(4)hydrate above the freezing point of *** same phenomenon was also observed in a sodium dodecyl sulfonate(SDS)-dry solution CH_(4)hydrate formation ***,the covering method can only intensify the self-preservation effect below the freezing point of water,but cannot generate a self-preservation effect.

关键词： Decomposition Inhibition methane hydrate Method Self-preservation effect

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Water transfer characteristics during methane hydrate formation and dissociation processes inside saturated sand

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Journal of Natural Gas Chemistry 2010年第1期19卷 71-76页

作者： Peng Zhang, Qingbai Wu, Yibin Pu, Guanli Jiang, Jing Zhan, Yingmei Wang State Key Laboratory, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China State Key Laboratory Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 Gansu China

Gas hydrates formation and dissociation processes inside porous media are always accompanied by water transfer behavior, which is similar to the water behavior of ice freezing and thawing processes. These processes have been studied by many researchers, but all the studies are so far on the water transfer characteristics outside porous media and the water transfer characteristics inside porous media have been little known. In this study, in order to study the water transfer characteristics inside porous media during methane hydrate formation and dissociation processes, a novel apparatus with three pF-meter sensors which can detect water content changes inside porous media was applied. It was experimentally observed that methane hydrate formation processes were accompanied by water transfer from bottom to top inside porous media, however, the water behavior during hydrate dissociation processes was abnormal, for which more studies are needed to find out the real reason in our future work.

关键词： methane hydrate formation and dissociation processes: water transfer inside porous media saturated

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Theoretical insights into thermal transport and structural stability mechanisms of triaxial compressed methane hydrate

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Chinese Physics B 2024年第9期33卷 494-504页

作者： Dong-Sheng Chen Ting-Ting Miao Cheng Chang Xu-Yang Guo Meng-Yan Guan and Zhong-Li Ji Beijing Key Laboratory of Process Fluid Filtration and Separation College of Mechanical andTransportation EngineeringChina University of Petroleum-BeijingBeijing 102249China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum-BeijingBeijing 102249China

The heat transfer and stability of methane hydrate in reservoirs have a direct impact on the drilling and production efficiency of hydrate resources,especially in complex stress environments caused by formation *** this study,we investigated the thermal transport and structural stability of methane hydrate under triaxial compression using molecular dynamics *** results suggest that the thermal conductivity of methane hydrate increases with increasing compression *** phonon transport mechanisms were identified as factors enhancing thermal *** low compressive strains,a low-frequency phonon transport channel was established due to the overlap of phonon vibration peaks between methane and water *** high compressive strains,the filling of larger phonon bandgaps facilitated the opening of more phonon transport ***,we found that a strain of􀀀0.04 is a watershed point,where methane hydrate transitions from stable to ***,a strain of􀀀0.06 marks the threshold at which the diffusion capacities of methane and water molecules are at their *** a higher strain of􀀀0.08,the increased volume compression reduces the available space,limiting the diffusion ability of water and methane molecules within the *** synergistic effect of the strong diffusion ability and high probability of collision between atoms increases the thermal conductivity of hydrates during the unstable period compared to the stable *** findings offer valuable theoretical insights into the thermal conductivity and stability of methane hydrates in reservoir stress environments.

关键词： methane hydrate molecular dynamics thermal transport triaxial compression structural stability

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P-T stability conditions of methane hydrate in sediment from South China Sea

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Journal of Natural Gas Chemistry 2011年第5期20卷 531-536页

作者： Shicai Sun Yuguang Ye Changling Liu Fengkui Xiang Yan Ma Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation College of Civil Engineering and Architecture Shandong University of Science and Technology Qingdao 266510 Shandong China Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology Ministry of Land and Resources Qingdao 266071 Shandong China Qingdao Institute of Marine Geology Qingdao 266071 Shandong China

For reasonable assessment and safe exploitation of marine gas hydrate resource, it is important to determine the stability conditions of gas hydrates in marine sediment. In this paper, the seafloor water sample and sediment sample （saturated with pore water） from Shenhu Area of South China Sea were used to synthesize methane hydrates, and the stability conditions of methane hydrates were investigated by multi-step heating dissociation method. Preliminary experimental results show that the dissociation temperature of methane hydrate both in seafloor water and marine sediment, under any given pressure, is depressed by approximately -1.4 K relative to the pure water system. This phenomenon indicates that hydrate stability in marine sediment is mainly affected by pore water ions.

关键词： sediment from South China Sea seafloor water methane hydrate stability condition

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Comparison of the water change characteristics between the formation and dissociation of methane hydrate and the freezing and thawing of ice in sand

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Journal of Natural Gas Chemistry 2009年第2期18卷 205-210页

作者： Peng Zhang Qingbai Wu Yingmei Wang State Key Laboratory of Frozen Soil Engineering Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences Lanzhou 730000 Gansu China

hydrate formation and dissociation processes are always accompanied by water migration in porous media, which is similar to the ice. In our study, a novel pF-meter sensor which could detect the changes of water content inside sand was first applied to hydrate formation and dissociation processes. It also can study the water change characteristics in the core scale of a partially saturated silica sand sample and compare the differences of water changes between the processes of formation and dissociation of methane hydrate and freezing and thawing of ice. The experimental results showed that the water changes in the processes of formation and dissociation of methane hydrate were basically similar to that of the freezing and thawing of ice in sand. When methane hydrate or ice was formed, water changes showed the decrease in water content on the whole and the pF values rose following the formation processes. However, there were very obvious differences between the ice thawing and hydrate dissociation.

关键词： methane hydrate ice formation and dissociation process freezing and thawing process water change

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Water transfer characteristics in the vertical direction during methane hydrate formation and dissociation processes inside non-saturated media

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Journal of Natural Gas Chemistry 2010年第2期19卷 139-145页

作者： Peng Zhang Qingbai Wu Guanli Jiang Jing Zhan Yingmei Wang State Key Laboratory Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 Gansu China

In order to study water transfer characteristics inside non-saturated media during methane hydrate formation and dissociation processes,water changes on the top,middle and bottom locations of experimental media during the reaction processes were continuously followed with a novel apparatus with three pF-meter *** sand,fine sand and loess were chosen as experimental *** was experimentally observed that methane hydrate was easier formed inside coarse sand and fine sand than inside *** hydrate formation configuration and water transfer characteristics during methane hydrate formation processes were very different among the different non-saturated media,which were important for understanding methane hydrate formation and dissociation mechanism inside sediments in nature.

关键词： water transfer methane hydrate formation and dissociation processes non-saturated

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Pore capillary pressure and saturation of methane hydrate bearing sediments

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Acta Oceanologica Sinica 2014年第10期33卷 30-36页

作者： SUN Shicai LIU Changling YE Yuguang LIU Yufeng Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation Shandong University of Science and Technology State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Qingdao Institute of Marine Geology

To better understand the relationship between the pore capillary pressure and hydrate saturation in sediments, a new method was proposed. First, the phase equilibria of methane hydrate in fine-grained silica sands were measured. As to the equilibrium data, the pore capillary pressure and saturation of methane hydrate were calculated. The results showed that the phase equilibria of methane hydrates in fine-grained silica sands changed due to the depressed activity of pore water caused by the surface group and negatively charged characteristic of silica particles as well as the capillary pressure in small pores together. The capillary pressure increased with the increase of methane hydrate saturation due to the decrease of the available pore space. However, the capillary-saturation relationship could not yet be described quantitatively because of the stochastic habit of hydrate growth.

关键词： methane hydrate equibrium silica sand saturation pore capillary pressure

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