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Journal articles on the topic 'Hydrates'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Daghash, Shaden M., Phillip Servio, and Alejandro D. Rey. "From Infrared Spectra to Macroscopic Mechanical Properties of sH Gas Hydrates through Atomistic Calculations." Molecules 25, no. 23 (2020): 5568. http://dx.doi.org/10.3390/molecules25235568.

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The vibrational characteristics of gas hydrates are key identifying molecular features of their structure and chemical composition. Density functional theory (DFT)-based IR spectra are one of the efficient tools that can be used to distinguish the vibrational signatures of gas hydrates. In this work, ab initio DFT-based IR technique is applied to analyze the vibrational and mechanical features of structure-H (sH) gas hydrate. IR spectra of different sH hydrates are obtained at 0 K at equilibrium and under applied pressure. Information about the main vibrational modes of sH hydrates and the fac

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2

Liashenko, Anna, Oleksandr Melnikov, Ruslan Petrash, and Oleksandr Petrash. "Wells Gas Hydrates Formation Analysis and Prevention Methods." International Journal of Engineering & Technology 7, no. 4.8 (2018): 328–31. http://dx.doi.org/10.14419/ijet.v7i4.8.27265.

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The article deals with laws of occurrence of gas hydrates in mining wells and prevention of their formation. The basic calculations for determining temperature regimes in wells have been described. The basic methods of struggle against hydrated deposits in wells have been demonstrated. The detailed description of hydrates occurrence causes is presented along with methods of its prevention from a technological perspective. This paper provides data on the techniques used for production string clearing from hydrate plagues. The conditions necessary for hydrates formations are presented. The techn

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3

Klymenko, Vasyl, Vasyl Gutsul, Volodymyr Bondarenko, Viktor Martynenko, and Peter Stets. "Modeling of the Kinetics of the Gas Hydrates Formation on the Basis of a Stochastic Approach." Solid State Phenomena 291 (May 2019): 98–109. http://dx.doi.org/10.4028/www.scientific.net/ssp.291.98.

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Recently, more attention has been paid to the development of gas hydrate deposits, the use of gas-hydrated technologies, suitable for energy-efficient transportation of natural gas, the separation of gas mixtures, production and storage of cold, desalinating of seawater, etc. Hydrate formation is one of the main processes of gas-hydrate technological installations. In the article a model is proposed that describes the kinetics of the formation of hydrate in disperse systems, which are characteristic for real conditions of operation of gas-hydrate installations, on the basis of a stochastic app

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4

Daghash, Shaden, Phillip Servio, and Alejandro Rey. "First-Principles Elastic and Anisotropic Characteristics of Structure-H Gas Hydrate under Pressure." Crystals 11, no. 5 (2021): 477. http://dx.doi.org/10.3390/cryst11050477.

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Evaluating gas hydrates properties contributes valuably to their large-scale management and utilization in fundamental science and applications. Noteworthy, structure-H (sH) gas hydrate lacks a comprehensive characterization of its structural, mechanical, and anisotropic properties. Anisotropic and pressure dependent properties are crucial for gas hydrates’ detection and recovery studies. The objective of this work is the determination of pressure-dependent elastic constants and mechanical properties and the direction-dependent moduli of sH gas hydrates as a function of guest composition. Firs

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Pedchenko, Mykhailo, Larysa Pedchenko, Tetiana Nesterenko, and Artur Dyczko. "Technological Solutions for the Realization of NGH-Technology for Gas Transportation and Storage in Gas Hydrate Form." Solid State Phenomena 277 (June 2018): 123–36. http://dx.doi.org/10.4028/www.scientific.net/ssp.277.123.

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The technology of transportation and storage of gas in a gas-hydrated form under atmospheric pressure and slight cooling – the maximum cooled gas-hydrated blocks of a large size covered with a layer of ice are offered. Large blocks form from pre-cooled mixture of crushed and the granulated mass of gas hydrate. The technology of forced preservation gas hydrates with ice layer under atmospheric pressure has developed to increase it stability. The dependence in dimensionless magnitudes, which describes the correlation-regressive relationship between the temperature of the surface and the center g

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6

Li, Yaobin, Xin Xin, Tianfu Xu, et al. "Production Behavior of Hydrate-Bearing Sediments with Mixed Fracture- and Pore-Filling Hydrates." Journal of Marine Science and Engineering 11, no. 7 (2023): 1321. http://dx.doi.org/10.3390/jmse11071321.

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Most hydrate-bearing sediments worldwide exhibit mixed pore- and fracture-filling hydrates. Due to the high exploitation value, pore-filling hydrate production is the focus of current hydrate production research, and there is a lack of systematic research on the decomposition of fracture-filling hydrates and their effects on the evolution of temperature and pressure in hydrate-bearing sediments. If only the decomposition characteristics of pore-filling hydrates are studied while the fracture-filling hydrates decomposition and its effects on the hydrate-bearing sediments production process are

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7

Braun, Doris, and Ulrich Griesser. "Insights into hydrate formation and stability of morphinanes." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C991. http://dx.doi.org/10.1107/s2053273314090081.

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The formation of multi-component crystals with water (hydrates) is a widespread phenomenon among organic molecules. Hydrate formation is of high practical relevance for industrially used materials, as it affects their physicochemical properties. [1,2] To exclude water or moisture in industrial processes is often difficult. Therefore knowledge about the existence and stability of hydrates and the understanding and control of the anhydrate/hydrate balance is mandatory for avoiding manufacturing problems. In order to improve our understanding of hydrate formation we selected representative substa

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8

Sun, Jian Ye, Yu Guang Ye, Chang Ling Liu, and Jian Zhang. "Experimental Study on Gas Production from Methane Hydrate Bearing Sand by Depressurization." Applied Mechanics and Materials 310 (February 2013): 28–32. http://dx.doi.org/10.4028/www.scientific.net/amm.310.28.

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The simulate experiments of gas production from methane hydrates reservoirs was proceeded with an experimental apparatus. Especially, TDR technique was applied to represent the change of hydrate saturation in real time during gas hydrate formation and dissociation. In this paper, we discussed and explained material transformation during hydrate formation and dissociation. The hydrates form and grow on the top of the sediments where the sediments and gas connect firstly. During hydrates dissociation by depressurization, the temperatures and hydrate saturation presented variously in different lo

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9

Kvamme, Bjørn, Jinzhou Zhao, Na Wei, and Navid Saeidi. "Hydrate—A Mysterious Phase or Just Misunderstood?" Energies 13, no. 4 (2020): 880. http://dx.doi.org/10.3390/en13040880.

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Hydrates that form during transport of hydrocarbons containing free water, or water dissolved in hydrocarbons, are generally not in thermodynamic equilibrium and depend on the concentration of all components in all phases. Temperature and pressure are normally the only variables used in hydrate analysis, even though hydrates will dissolve by contact with pure water and water which is under saturated with hydrate formers. Mineral surfaces (for example rust) play dual roles as hydrate inhibitors and hydrate nucleation sites. What appears to be mysterious, and often random, is actually the effect

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10

Horvat, Kristine, and Devinder Mahajan. "Carbon dioxide-induced liberation of methane from laboratory-formed methane hydrates." Canadian Journal of Chemistry 93, no. 9 (2015): 998–1006. http://dx.doi.org/10.1139/cjc-2014-0562.

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This paper reports a laboratory mimic study that focused on the extraction of methane (CH4) from hydrates coupled with sequestration of carbon dioxide (CO2) as hydrates, by taking advantage of preferential thermodynamic stability of hydrates of CO2 over CH4. Five hydrate formation-decomposition runs focused on CH4–CO2 exchange, two baselines and three with host sediments, were performed in a 200 mL high-pressure Jerguson cell fitted with two glass windows that allowed visualization of the time-resolved hydrate phenomenon. The baseline pure hydrates formed from artificial seawater (75 mL) under

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11

Sai, Kateryna. "RESEARCH INTO PECULIARITIES OF PHASE TRANSITIONS DURING THE DISSOCIATION OF GAS HYDRATES." JOURNAL of Donetsk Mining Institute, no. 2 (2021): 51–59. http://dx.doi.org/10.31474/1999-981x-2021-2-51-59.

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Purpose. Analytical study of the dissociation process of gas hydrates taking into account the peculiarities of phase transitions occurring during their dissociation and described by the Clausius-Clapeyron equation. Methods. The research uses an integrated approach, which includes the analysis and generalization of literature sources devoted to studying the peculiarities and thermobaric properties of gas hydrates; processes of hydrate formation and accumulation; methods for the development of gas hydrate deposits and technologies for extracting the methane gas from them; analytical calculations

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12

Guo, Zhiqi, Xiaoyu Lv, Cai Liu, Haifeng Chen, and Zhiguang Cai. "Characterizing Gas Hydrate–Bearing Marine Sediments Using Elastic Properties—Part 1: Rock Physical Modeling and Inversion from Well Logs." Journal of Marine Science and Engineering 10, no. 10 (2022): 1379. http://dx.doi.org/10.3390/jmse10101379.

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Gas hydrates are considered a potential energy source for the future. Rock physics modeling provides insights into the elastic response of sediments containing gas hydrates, which is essential for identifying gas hydrates using well-log data and seismic attributes. This paper establishes a rock physics model (RPM) by employing effective medium theories to quantify the elastic properties of sediments containing gas hydrates. Specifically, the proposed RPM introduces critical gas hydrate saturation for various modeling schemes. Such a key factor considers the impact of gas hydrates on sediment s

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13

Du, Bing-rui, Da-wei Bai, Peng-hui Zhang, Peng Guo, and Qiang Zhang. "Physical Experiment Research on Dielectric Properties of Hydrate-bearing Sediment in Sandstone Reservoir." E3S Web of Conferences 118 (2019): 03046. http://dx.doi.org/10.1051/e3sconf/201911803046.

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Dielectric constants can be used to detect hydrates in permafrost regions. Therefore, this study investigated the relationships between the dielectric constant characteristics of sandstone reservoir hydrate and the hydrate saturation degree through physical simulation experiments, as well as the granularity of the surrounding rock. Methane and tetrahydrofuran (THF) hydrates with quartz sands were prepared, and their dielectric constants were analyzed. With different granularities of quartz sands, the dielectric constants of two different methane hydrate sediments decreased with increasing satu

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14

Lu, Cheng, Pengfei Xie, Hui Li, et al. "Study on the Mechanical Properties of Silty Clay Sediments with Nodular Hydrate Occurrence." Journal of Marine Science and Engineering 10, no. 8 (2022): 1059. http://dx.doi.org/10.3390/jmse10081059.

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Natural gas hydrates are a strategic energy resource in China. The China Geological Survey has discovered segregated hydrate mass formations under the seepage mechanism in the South China Sea through exploration, and gas hydrates occur in nodular, massive, and vein formations in silty clay sediment. Previous work has focused on the analysis of sediment mechanical properties with respect to the uniform distribution of natural gas hydrates in pore spaces, but the mechanical properties of hydrate-bearing sediments containing segregated hydrate masses are not well understood. Spherical hydrates ar

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15

Li, Nan, Rezeye Rehemituli, Jie Zhang, and Changyu Sun. "One-Dimensional Study on Hydrate Formation from Migrating Dissolved Gas in Sandy Sediments." Energies 13, no. 7 (2020): 1570. http://dx.doi.org/10.3390/en13071570.

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Upward migration of gas-dissolved pore fluid is an important mechanism for many naturally occurring hydrate reservoirs. However, there is limited understanding in this scenario of hydrate formation in sediments. In this preliminary work, hydrate formation and accumulation from dissolved gas in sandy sediments along the migration direction of brine was investigated using a visual hydrate simulator. Visual observation was employed to capture the morphology of hydrates in pores through three sapphire tubes. Meanwhile, the resistivity evolution of sediments was detected to characterize hydrate dis

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16

Li, Xian, Hongfeng Lu, Panpan Zhang, Lu Yu, Changwen Xiao, and Yan Li. "Numerical Simulation of Secondary Hydrate Formation Characteristics and Effectiveness of Prevention Methods." Energies 17, no. 20 (2024): 5045. http://dx.doi.org/10.3390/en17205045.

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The exploitation of natural gas hydrates by the pressure reduction method is affected by the decomposition heat absorption effect, and the range of the formation temperature reduction area is expanding. At the same time, the temperature reduction phenomenon is more significant around the production wells under the influence of gas throttling and expansion effects, and hydrate formation will occur under certain temperature and pressure conditions, leading to blockage of effective seepage channels in the reservoir in the region and elevation of seepage resistance, which may affect the output of

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17

Malakhova, Valentina V. "INFLUENCE OF SALT DIFFUSION ON THE STABILITY OF METHANE GAS HYDRATE IN THE ARCTIC SHELF." Interexpo GEO-Siberia 4, no. 1 (2020): 91–97. http://dx.doi.org/10.33764/2618-981x-2020-4-1-91-97.

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Suitable conditions for the formation of methane hydrates exist in the bottom sediments of shallow Arctic shelves in the presence of permafrost. Salt diffusion into hydrated bottom sediments can help accelerate hydrate degradation. An analysis of the influence of salinity of the bottom sediments of the Arctic shelf on the thickness of the methane hydrate stability zone was based on mathematical modeling. Estimates of the thickness of the stability zone were obtained in experiments with various correlations which relate the hydrate dissociation temperature in the presence of aqueous solutions c

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18

Okereke, Ndubuisi U., Pius E. Edet, Yahaya D. Baba, et al. "An assessment of hydrates inhibition in deepwater production systems using low-dosage hydrate inhibitor and monoethylene glycol." Journal of Petroleum Exploration and Production Technology 10, no. 3 (2019): 1169–82. http://dx.doi.org/10.1007/s13202-019-00812-4.

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AbstractIn this study, a deepwater pipeline-riser system that experienced hydrates was modelled in MAXIMUS 6.20 (an integrated production modelling tool) to understand, predict and mitigate hydrates formation in typical deepwater system. Highlights of the results from this study suggest that the injection of low-dosage hydrate inhibitors (LDHIs) into the hydrate-forming structures within the multiphase flow stream disperses the hydrates particles in an irregular manner and subsequently decreases the nucleation rate of the hydrate and prevents the formation of hydrates. This study found that th

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19

Chen, Huan, Bingyue Han, Chen Lang, Min Wen, Baitao Fan, and Zheyuan Liu. "Hydrates for Cold Storage: Formation Characteristics, Stability, and Promoters." Applied Sciences 11, no. 21 (2021): 10470. http://dx.doi.org/10.3390/app112110470.

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The potential of hydrates formed from R141b (CH3CCl2F), trimethylolethane (TME), and tetra-n-butylammonium bromide/tetra-n-butylammonium chloride (TBAB/TBAC) to be used as working substances for cold storage was investigated to provide a solution for unbalanced energy grids. In this study, the characteristics of hydrate formation, crystal morphology of hydrates, and the stability of hydrate in cyclic formation under 0.1 MPa and at 5 °C were carried out. It found that the ice had a positive effect on the hydrate formation under same conditions. Upon the addition of the ice cube, the induction t

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Xu, Chun-Gang, Min Wang, Gang Xu, et al. "The Relationship between Thermal Characteristics and Microstructure/Composition of Carbon Dioxide Hydrate in the Presence of Cyclopentane." Energies 14, no. 4 (2021): 870. http://dx.doi.org/10.3390/en14040870.

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Hydrate-based carbon dioxide (CO2) separation and capture is a new technology for achieving CO2 emission reduction. However, it is still not commercially applied for the ambiguity of microscopic hydrate formation mechanism. In a constant volume experiment of hydrate formation, there are two or more pressure platforms, indicating that there might be two or more different hydrates formation in succession. In order to reveal the relationship between the microscopic process and the gas consumption in the process of hydrate formation, hydrate composition and formation mechanism of cyclopentane-CO2

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Li, Lili, Pengwei Zhang, Ming Yang, and Baoguo Liu. "Thermal-hydro coupling model of methane hydrate reformation in porous media." IOP Conference Series: Earth and Environmental Science 1335, no. 1 (2024): 012048. http://dx.doi.org/10.1088/1755-1315/1335/1/012048.

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Abstract Methane hydrates are crystalline compounds found in marine sediments and permafrost regions. Methane hydrates remain stable under both low-temperature and high-pressure conditions. When a methane hydrate reservoir is heated or depressurized, methane hydrates become unstable and decompose into water and methane gases. The heat absorption process during the decomposition of methane hydrates influences the temperature field. Methane hydrate reformation occurs during the extraction process, significantly reducing the hydraulic conductivity of the reservoir and hindering the long-term stab

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22

Qi, Ying Xia, and Hua Zhang. "MD Simulation of CO₂-CH₄ Mixed Hydrate on Crystal Structure and Stability." Advanced Materials Research 181-182 (January 2011): 310–15. http://dx.doi.org/10.4028/www.scientific.net/amr.181-182.310.

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MD simulations are carried out on the sI CO2-CH4 mixed hydrates in the constant-NVT and constant-NPT ensembles for the two cases of CO2 occupancy. One is 75% called normal, the other is 87.5%. The simulations results show that the hydrate structure can be maintained both for the two hydrates over the temperature range of 0K to 300K. However, the equilibrium pressure, the potential energy and the MSDs of the atoms in H2O for the higher CO2 ratio hydrates is larger than that of the normal CO2 ratio hydrates, indicating that the normal mixed hydrates is more stable than the higher CO2 occupancy m

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Gaidukova, Olga, Sergei Misyura, and Pavel Strizhak. "Key Areas of Gas Hydrates Study: Review." Energies 15, no. 5 (2022): 1799. http://dx.doi.org/10.3390/en15051799.

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Gas hydrates are widespread all over the world. They feature high energy density and are a clean energy source of great potential. The paper considers experimental and theoretical studies on gas hydrates in the following key areas: formation and dissociation, extraction and transportation technologies of natural methane hydrates, and ignition, and combustion. We identified a lack of research in more areas and defined prospects of further development of gas hydrates as a promising strategic resource. One of the immediate problems is that there are no research findings for the effect of sediment

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Chuvilin, Evgeny, Valentina Ekimova, Boris Bukhanov, Sergey Grebenkin, Natalia Shakhova, and Igor Semiletov. "Role of Salt Migration in Destabilization of Intra Permafrost Hydrates in the Arctic Shelf: Experimental Modeling." Geosciences 9, no. 4 (2019): 188. http://dx.doi.org/10.3390/geosciences9040188.

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Destabilization of intrapermafrost gas hydrate is one possible reason for methane emission on the Arctic shelf. The formation of these intrapermafrost gas hydrates could occur almost simultaneously with the permafrost sediments due to the occurrence of a hydrate stability zone after sea regression and the subsequent deep cooling and freezing of sediments. The top of the gas hydrate stability zone could exist not only at depths of 200–250 m, but also higher due to local pressure increase in gas-saturated horizons during freezing. Formed at a shallow depth, intrapermafrost gas hydrates could lat

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Safronov, Anatolii. "KEY ASPECTS OF THERMAL METHODS FOR DEVELOPMENT OF MARINE GAS HYDRATES ON THE EXAMPLE OF THE METHODS OF USING THERMAL WATERS AND INJECTION OF HOT WATER INTO THE FORMATION." SCIENTIFIC PAPERS OF DONNTU Series: “The Mining and Geology”, no. 1(31)-2(32) (2024): 98–103. https://doi.org/10.31474/2073-9575-2024-1(31)-2(32)-98-103.

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Purpose: to highlight key aspects of thermal methods for development of marine gas hydrates when using thermal waters and their injection into the formation. Methods: the work uses one of the methods of using thermal waters for development of marine gas hydrates. Findings: The features of the use of thermal methods for development of marine gas hydrates by supplying heat to the gas hydrate decomposition zone, heating the wellbore with heaters, steam-cyclic treatment of the well, etc. are analyzed. The advantages and disadvantages of the above methods are characterized, and a conclusion is made

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de Lima Silva, Paulo H., Mônica F. Naccache, Paulo R. de Souza Mendes, Leandro S. Valim, and Adriana Teixeira. "Effect of Alcohols on the Rheological Properties of Tetrahydrofuran Hydrate Slurries." SPE Journal 25, no. 06 (2020): 3111–19. http://dx.doi.org/10.2118/201101-pa.

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Summary Hydrate formation is an issue that can have a significant negative economic impact on the oil industry. Hydrates are crystalline solids that resemble ice, usually formed in the presence of a mixture of oil/gas/water in conditions of high pressure and low temperature, similar to those found in deepwater oil production. Depending on the amount of hydrates formed, production lines can be severely affected, causing huge financial losses. Therefore, it is of great interest to understand and analyze the characteristics of the hydrates formed, and eventually identify means of mitigating hydra

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Kutnyi, Bogdan, and . "Termotechnical Characteristics Determination of Enclosing Structures for Hydrates Storage." International Journal of Engineering & Technology 7, no. 3.2 (2018): 510. http://dx.doi.org/10.14419/ijet.v7i3.2.14580.

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In many countries around the world, gas hydrates use is seen as a promising alternative source of energy. The industrial infrastructure gas hydrates use requires the creation of reliable means for their storage and transportation.In the paper the research installations schemes and the dissociated gas temperature regime hydrate experimental study results are given. The surface and propane hydrate deep layers temperature regime, which decomposes under atmospheric pressure, is analyzed. Convective and radiant heat transfer at the hydrate storage reservoir inner surface is considered and the tempe

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Wang, Yubin, Wei Liu, Bin Li, Xiaochen Yan, Yunchen Wang, and Fan Xiao. "Influence of natural gas component changes on hydrate generation temperature and pressure." Journal of Physics: Conference Series 2788, no. 1 (2024): 012007. http://dx.doi.org/10.1088/1742-6596/2788/1/012007.

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Abstract During the transportation of natural gas through pipelines, there is a potential for the formation of gas hydrates. These hydrates can result in pipeline blockages, causing economic losses and significant safety hazards. Therefore, it holds crucial reference value to understand the conditions under which hydrates are formed and to grasp the laws governing their generation for effective prevention and control. This study employs the P-P hydrate thermodynamic model to compute the temperature and pressure at which natural gas generates hydrates. We also explore the impact of changes in t

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Gabitto, Jorge F., and Costas Tsouris. "Physical Properties of Gas Hydrates: A Review." Journal of Thermodynamics 2010 (January 12, 2010): 1–12. http://dx.doi.org/10.1155/2010/271291.

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Methane gas hydrates in sediments have been studied by several investigators as a possible future energy resource. Recent hydrate reserves have been estimated at approximately 1016 m3 of methane gas worldwide at standard temperature and pressure conditions. In situ dissociation of natural gas hydrate is necessary in order to commercially exploit the resource from the natural-gas-hydrate-bearing sediment. The presence of gas hydrates in sediments dramatically alters some of the normal physical properties of the sediment. These changes can be detected by field measurements and by down-hole logs.

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Nalyvaiko, Oleksandr, Pavlo Pysarenko, Yevhenii Nalyvaiko, and Nikolay Tanchev. "Methane gas hydrates of the Black Sea – environmental problem or energy source?" Journal of Innovations and Sustainability 6, no. 4 (2022): 04. http://dx.doi.org/10.51599/is.2022.06.04.04.

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Purpose. The purpose of this paper is to substantiate the technological solution of equilibrium conditions in the system “methane – water phase – hydrate – R-2M”; to reveal existing ecological problems of methane gas hydrate extraction from the Black Sea bottom; to determine whether gas hydrate deposits of Black Sea methane are an ecological problem or should be considered as an energy source, to explain the necessity of introduction of the effect of forced self-preservation of methane gas hydrates into development of gas hydrates from the sea bottom. Results. This article analyses curre

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Kliner, J. R., and J. LH Grozic. "Determination of synthetic hydrate content in sand specimens using dielectrics." Canadian Geotechnical Journal 43, no. 6 (2006): 551–62. http://dx.doi.org/10.1139/t06-022.

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Gas hydrates are solid crystalline compounds (clathrates) that encage gas molecules inside the lattices of hydrogen bonded water molecules within a specific temperaturepressure stability zone. It is imperative that reliable detection and quantification modi operandi are developed, as proposed in this research, to identify hydrate-laden strata and determine economic viability of this potential energy yield. This paper presents the experimental analysis of synthetic refrigerant (R-11) hydrates in 20/30 Ottawa sand using dielectric principles to determine specific hydrate content. Hydrate specim

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Gauteplass, Jarand, Stian Almenningen, Tanja Barth, and Geir Ersland. "Hydrate Plugging and Flow Remediation during CO2 Injection in Sediments." Energies 13, no. 17 (2020): 4511. http://dx.doi.org/10.3390/en13174511.

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Successful geological sequestration of carbon depends strongly on reservoir seal integrity and storage capacity, including CO2 injection efficiency. Formation of solid hydrates in the near-wellbore area during CO2 injection can cause permeability impairment and, eventually, injectivity loss. In this study, flow remediation in hydrate-plugged sandstone was assessed as function of hydrate morphology and saturation. CO2 and CH4 hydrates formed consistently at elevated pressures and low temperatures, reflecting gas-invaded zones containing residual brine near the injection well. Flow remediation b

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Liu, Huaxin, Meijun Li, Hongfei Lai, Ying Fu, Zenggui Kuang, and Yunxin Fang. "Controlling Factors of Vertical Geochemical Variations in Hydrate-Rich Sediments at the Site GMGS5-W08 in the Qiongdongnan Basin, Northern South China Sea." Energies 17, no. 2 (2024): 412. http://dx.doi.org/10.3390/en17020412.

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Large amounts of natural gas hydrates have been discovered in the Qiongdongnan Basin (QDNB), South China Sea. The chemical and stable carbon isotopic composition shows that the hydrate-bound gas was a mixture of thermogenic and microbial gases. It is estimated that microbial gas accounts for 40.96% to 60.58%, showing a trend of decrease with the increase in burial depth. A significant amount of gas hydrates is thought to be stored in the mass transport deposits (MTDs), exhibiting vertical superposition characteristics. The stable carbon isotopic values of methane (δ13C1) in the MTD1, located n

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Haiko, Hennadii, Oleksandr Zhivkov, and Lubov Pyha. "Application of resonant oscillatory systems for the seafloor gas hydrates development." E3S Web of Conferences 230 (2021): 01020. http://dx.doi.org/10.1051/e3sconf/202123001020.

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The prospects for the gas recovery from bottom gas hydrates are studied, and the necessity for the formation of an innovation environment and practical steps for conducting industrial experiments are formulated. The promising methods of shielded development of seafloor gas hydrate deposits are analyzed and the technical problems of their improvement are revealed. The possibilities of using resonant oscillatory systems for the shielded development of bottom gas hydrates are studied, in particular, a Helmholtz flow-excited resonator. The expediency of using high-quality oscillations of the “rota

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Kvamme, Bjørn, Jinzhou Zhao, Na Wei, et al. "Why Should We Use Residual Thermodynamics for Calculation of Hydrate Phase Transitions?" Energies 13, no. 16 (2020): 4135. http://dx.doi.org/10.3390/en13164135.

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The formation of natural gas hydrates during processing and transport of natural has historically been one of the motivations for research on hydrates. In recent years, there has been much focus on the use of hydrate as a phase for compact transport of natural gas, as well as many other applications such as desalination of seawater and the use of hydrate phase in heat pumps. The huge amounts of energy in the form of hydrates distributed in various ways in sediments is a hot topic many places around the world. Common to all these situations of hydrates in nature or industry is that temperature

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Chuvilin, Evgeny, Dinara Davletshina, Boris Bukhanov, Aliya Mukhametdinova, and Vladimir Istomin. "Formation of Metastability of Pore Gas Hydrates in Frozen Sediments: Experimental Evidence." Geosciences 12, no. 11 (2022): 419. http://dx.doi.org/10.3390/geosciences12110419.

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The Arctic permafrost and zones of hydrate stability may evolve to the conditions that allow gas hydrates to remain metastable for a long time due to self-preservation within 150 m depths. The behavior of relict (metastable) gas hydrates in frozen sediments is controlled externally by pressure and temperature and internally by the properties of hydrate particles and sediments. The sensitivity of the dissociation and self-preservation of pore gas hydrates to different factors is investigated in laboratory experiments. The observations focus on time-dependent changes in methane hydrate saturatio

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Srivastava, Shubhangi, Bernd Hitzmann, and Viktoria Zettel. "A Future Road Map for Carbon Dioxide (CO2) Gas Hydrate as an Emerging Technology in Food Research." Food and Bioprocess Technology 14, no. 9 (2021): 1758–62. http://dx.doi.org/10.1007/s11947-021-02656-5.

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AbstractGas hydrates constitute of gas as a guest molecule in hydrogen-bonded water lattices. This review covers ongoing hydrate research in food technology with a spotlight on carbon dioxide (CO2) application as a hydrate. The application of gas hydrates in the concentration of juices, desalination, carbonation, and food preservation has been covered in the review. One of the applications of CO2 hydrate technology was in the concentration of orange juice which gave a dehydration ratio (DR) of 57.2% at a pressure of 4.1 MPa. Similarly, one study applied it for the tomato juice concentration an

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Vorozhtsova, Yulia S., Alexander V. Melent'ev, Alexander A. Uspensky, Dmitry V. Kremnev, Mikhail A. Radin, and Alexander A. Slobodov. "THERMODYNAMIC PROPERTIES OF GAS HYDRATE COMPOUNDS." Bulletin of the Saint Petersburg State Institute of Technology (Technical University) 59 (2021): 12–20. http://dx.doi.org/10.36807/1998-9849-2021-59-85-12-20.

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The most stable forms (compositions) and thermodynamic characteristics of gas hydrates СН4•6Н2О, С2Н6•8Н2О, С3Н8•17Н2О, i-С4Н10•17Н2О, СO2•6Н2О, O2•6Н2О, H2S•6Н2О, N2•6Н2О, Ar•6Н2О were defined based on the analysis of literature data and own research on the composition and thermodynamic properties of gas hydrate compounds. Correlation dependences of thermodynamic characteristics of gas hydrates depending on the composition were graphed. All the main thermodynamic characteristics of gas hydrates – standard enthalpies and Gibbs energies of formation, standard entropies, temperature dependences

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Kalacheva, L. P., I. K. Ivanova, A. S. Portnyagin, I. I. Rozhin, K. K. Argunova, and A. I. Nikolaev. "Determination of the lower boundaries of the natural gas hydrates stability zone in the subpermafrost horizons of the Yakut arch of the Vilyui syneclise, saturated with bicarbonate-sodium type waters." SOCAR Proceedings, SI2 (December 30, 2021): 1–11. http://dx.doi.org/10.5510/ogp2021si200549.

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This paper considers the possibility of the underground gas storage facilities creating in a hydrate state on the north-western slope of the Yakut arch of the Vilyui syneclise. For this, the boundaries of the hydrate stability zone were determined for 6 promising areas of the considered geological structure. Equilibrium conditions of the natural gas hydrates formation in the model porous media containing bicarbonate-sodium type water (mineralization 20 g/l), characteristic for the subpermafrost horizons of the Yakut arch, have been studied by the method of differential thermal analysis. On the

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Liu, Lu, Yuanxin Yao, Xuebing Zhou, Yanan Zhang, and Deqing Liang. "Improved Formation Kinetics of Carbon Dioxide Hydrate in Brine Induced by Sodium Dodecyl Sulfate." Energies 14, no. 8 (2021): 2094. http://dx.doi.org/10.3390/en14082094.

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Due to high efficiency and low cost, hydrate-based desalination is investigated as a pretreatment method for seawater desalination. To improve the formation rate of hydrates, the effect of sodium dodecyl sulfate (SDS) on CO2 hydrate formation from a 3.5 wt.% NaCl solution was measured at 275 K and 3 MPa. X-ray diffraction (XRD) and cryo-scanning electron microscopy (cryo-SEM) were used to measure the crystal structure and micromorphology of the formed hydrates. The results showed that the induction time of CO2 hydrate formation reduced from 32 to 2 min when SDS concentration increased from 0.0

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Chuvilin, Davletshina, Ekimova, Bukhanov, Shakhova, and Semiletov. "Role of Warming in Destabilization of Intrapermafrost Gas Hydrates in the Arctic Shelf: Experimental Modeling." Geosciences 9, no. 10 (2019): 407. http://dx.doi.org/10.3390/geosciences9100407.

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Destabilization of intrapermafrost gas hydrates is one of the possible mechanisms responsible for methane emission in the Arctic shelf. Intrapermafrost gas hydrates may be coeval to permafrost: they originated during regression and subsequent cooling and freezing of sediments, which created favorable conditions for hydrate stability. Local pressure increase in freezing gas-saturated sediments maintained gas hydrate stability from depths of 200–250 meters or shallower. The gas hydrates that formed within shallow permafrost have survived till present in the metastable (relict) state. The metasta

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Soromenho, Mário R. C., Anastasiia Keba, José M. S. S. Esperança, and Mohammad Tariq. "Effect of Thiouronium-Based Ionic Liquids on the Formation and Growth of CO2 (sI) and THF (sII) Hydrates." International Journal of Molecular Sciences 23, no. 6 (2022): 3292. http://dx.doi.org/10.3390/ijms23063292.

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In this manuscript, two thiouronium-based ionic liquids (ILs), namely 2-ethylthiouronium bromide [C2th][Br] and 2-(hydroxyethyl)thiouronium bromide [C2OHth][Br], were tested at different concentrations (1 and 10 wt%) for their ability to affect CO2 (sI) and tetrahydrofuran (THF) (sII) hydrate formation and growth. Two different methods were selected to perform a thermodynamic and kinetic screening of the CO2 hydrates using a rocking cell apparatus: (i) an isochoric pressure search method to map the hydrate phase behavior and (ii) a constant ramping method to obtain the hydrate formation and di

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Freij-Ayoub, R., M. Rivero, and E. Nakagawa. "HYDRATES—A CHALLENGE IN FLOW ASSURANCE FOR OIL AND GAS PRODUCTION IN DEEP AND ULTRA-DEEP WATER." APPEA Journal 46, no. 1 (2006): 395. http://dx.doi.org/10.1071/aj05022.

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Offshore exploration and production is going to deep and ultra deep waters, driven by the depletion of continental shelf reserves and the high demand for hydrocarbons. This move requires the continued extension of existing technologies and the development of new technologies that will make the investment economically viable. Innovative flow assurance technology is needed to support ultra deepwater production, particularly within the concept of platform free fields where there is a need to minimise interventions.Hydrates present one of the major challenges in flow assurance. Deep and ultra deep

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Pavlenko, Anatoliy. "Self-preservation Effect of Gas Hydrates." Rocznik Ochrona Środowiska 23 (2021): 346–55. http://dx.doi.org/10.54740/ros.2021.023.

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This work was performed to improve the storage and transportation technology of gas hydrates in nonequilibrium conditions. At atmospheric pressure and positive ambient temperature, they gradually dissociate into gas and water. Simulation of the gas hydrate dissociation will determine optimal conditions for their transportation and storage, as well as minimize gas loss. Thermodynamic parameters of adiabatic processes of forced preservation of pre-cooled gas hydrate blocks with ice layer were determined theoretically and experimentally. Physical and mathematical models of these processes were pr

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Pan, Mengdi, and Judith M. Schicks. "Unraveling the Role of Natural Sediments in sII Mixed Gas Hydrate Formation: An Experimental Study." Molecules 28, no. 15 (2023): 5887. http://dx.doi.org/10.3390/molecules28155887.

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Considering the ever-increasing interests in natural gas hydrates, a better and more precise knowledge of how host sediments interact with hydrates and affect the formation process is crucial. Yet less is reported for the effects of sediments on structure II hydrate formation with complex guest compositions. In this study, experimental simulations were performed based on the natural reservoir in Qilian Mountain permafrost in China (QMP) due to its unique properties. Mixed gas hydrates containing CH4, C2H6, C3H8, and CO2 were synthesized with the presence of natural sediments from QMP, with qua

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Xie, Ying Ming, Jin Ming Gong, Tao Tang, Dao Ping Liu, Ni Liu, and Ying Xia Qi. "Experimental Research on Hydrogen Storage Characteristics of TBAB Hydrates." Advanced Materials Research 415-417 (December 2011): 1697–702. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.1697.

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The hydrogen storage characteristics of Tetra Butyl Ammonium Bromide (abbr. TBAB) hydrates were studied in a high pressure gas hydrate experimental apparatus. The effects of temperature and pressure on hydrogen storage characteristics under the condition of constant volume were discussed. The results showed that lower reaction temperature or higher reaction pressure can cause to a rapid formation of hydrogen hydrate and a larger hydrogen storage density, Comparing with tetrahydrofuran (abbr. THF) hydrates under same temperature and pressure, TBAB hydrates have faster hydrogen storage rate and

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Zaripova, Yulia, Vladimir Yarkovoi, Mikhail Varfolomeev, Rail Kadyrov, and Andrey Stoporev. "Influence of Water Saturation, Grain Size of Quartz Sand and Hydrate-Former on the Gas Hydrate Formation." Energies 14, no. 5 (2021): 1272. http://dx.doi.org/10.3390/en14051272.

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The development of technologies for the accelerated formation or decomposition of gas hydrates is an urgent topic. This will make it possible to utilize a gas, including associated petroleum one, into a hydrate state for its further use or to produce natural gas from hydrate-saturated sediments. In this work, the effect of water content in wide range (0.7–50 mass%) and the size of quartz sand particles (porous medium; <50 μm, 125–160 μm and unsifted sand) on the formation of methane and methane-propane hydrates at close conditions (subcooling value) has been studied. High-pressure different

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Yang, Bo, Xiangyun Hu, Wule Lin, Shuang Liu, and Hui Fang. "Exploration of permafrost with audiomagnetotelluric data for gas hydrates in the Juhugeng Mine of the Qilian Mountains, China." GEOPHYSICS 84, no. 4 (2019): B247—B258. http://dx.doi.org/10.1190/geo2018-0469.1.

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In China, gas hydrates in onshore permafrost areas have so far only been found in the Juhugeng Mine of the Qilian Mountains. However, their subsurface distribution remains unclear. Electrical resistivity logs have revealed that zones containing gas hydrates have higher resistivity than surrounding zones, which makes electromagnetic methods viable for detecting gas-hydrate deposits. We have deployed a natural-source audio-magnetotelluric (AMT) survey at the Juhugeng Mine. AMT data were collected at 176 sites along five profiles, and resistivity models were derived from 2D inversions after detai

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Wang, Lei, Shu Li Wang, and Tian Tian Kang. "Surfactant Effect of Promoting Research on Hydrate Formation." Advanced Materials Research 1092-1093 (March 2015): 220–25. http://dx.doi.org/10.4028/www.scientific.net/amr.1092-1093.220.

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Gas hydrates are a major concern in oil and gas industry, Gas hydrates form in small amounts of water, gas, and the appropriate pressure and temperature conditions. Gas hydrate storage and transportation technology starts a new way for energy storage and transportation industry. The most critically technical problem is how to improve the hydrate formation rate, storage capacity and form continuously. The influences of surfactants on induction time in three types of solution with equal concentration were studied by means of visual hydrate experimental equipment, and generalized induction time w

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Liang, Shuai, and Peter G. Kusalik. "The nucleation of gas hydrates near silica surfaces." Canadian Journal of Chemistry 93, no. 8 (2015): 791–98. http://dx.doi.org/10.1139/cjc-2014-0443.

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Understanding the nucleation and crystal growth of gas hydrates near mineral surfaces and in confinement are critical to the methane recovery from gas hydrate reservoirs. In this work, through molecular dynamics simulation studies, we present an exploration of the nucleation behavior of methane hydrates near model hydroxylated silica surfaces. Our simulation results indicate that the nucleation of methane hydrates can initiate from the silica surfaces despite of the structural mismatch of the two solid phases. A layer of intermediate half-cage structures was observed between the gas hydrate an

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