Temperature Variation during Salt Migration in Frozen Hydrate-Bearing Sediments: Experimental Modeling

Chuvilin, Evgeny; Ekimova, Valentina; Davletshina, Dinara; Bukhanov, Boris; Krivokhat, Ekaterina; Shilenkov, Vladimir

doi:10.3390/geosciences12070261

Cited by 5 publications

(6 citation statements)

References 46 publications

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“…It can be seen that the curve Frontiers in Energy Research frontiersin.org shape of position 1A and 2A has similar "well" shape. The temperature decreased firstly because of the intense endothermic process of hydrate dissociation promoted by the salt effect of the self-heating solution, which phenomenon had been reported widely in other studies (Yuan et al, 2013a;Chuvilin et al, 2022). And then, the temperature increased to the highest temperature point 60 °C, which is because of the continuous heat supply from the chemical reaction between NaNO 2 and NH 4 Cl.…”

Section: Temperature Variation Characteristics During the Self-heatin...mentioning

confidence: 79%

Exothermic characteristics research of chemical self-heating solution in the gas hydrate exploitation process

Zheng

Zhou³

et al. 2022

Front. Energy Res.

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Thermal stimulation methods of hydrate exploitation with chemical self-heating solution began to be investigated in the recent years. However, the exothermic characteristics of chemical self-heating solution during the gas hydrate exploitation process was not investigated systematically now. In this work, the effects of reagent concentration, acid variety, acid concentration on the exothermic characteristics were investigated by a self-designed high pressure autoclave with a 11.75 L volume, whose diameter and length is 100 and 1,500 mm, respectively. The experimental results showed that the temperature of hydrate reservoir will change in a wide range (from 100°C to −3°C) during the injection process of self-heating solution which was a large challenge to control the rate of heat release. During the self-heating solution injection, the temperature decreased quickly because of the strong endothermic reaction of hydrate dissociation promoted by the salt effect of self-heating solution, and then the temperature increased quickly because of exothermic reaction of self-heating solution. The exothermic rate of self-heating solution increased with the increase of reagent concentration, the acid concentration and the acidity. In all of the experiments, the temperatures near the inlet entrance were much higher than that in the deeper area, which illustrated that the effective heating area is the areas near the entrance. In the end, the different injection mode of mixed injection and sectional injection was also investigated, and it was found that the temperature peak in the near area with mixed injection mode is higher than that with sectional injection mode, however, the exothermic performance with sectional injection mode is better than that with mixed injection in the area far away from the inlet entrance. The exothermic characteristics studies of self-heating solution in this work can lay the necessary foundation of the further studies of self-heating solution in the exploitation of natural gas hydrate.

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Section: Temperature Variation Characteristics During the Self-heatin...mentioning

confidence: 79%

Exothermic characteristics research of chemical self-heating solution in the gas hydrate exploitation process

Zheng

Zhou³

et al. 2022

Front. Energy Res.

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“…Equilibrium disturbance is essential for CH 4 production through carbon dioxide injection/mixed gas injection, − thermal stimulation, ,, depressurization, − chemical inhibitor injection, − or a combination of these. , The advantages and disadvantages of these methods are listed in Table . However, the depressurization method is the best reported through experiments with low operation costs, having been tested successfully in the United States, Japan, China, Russia, and Canada. − There are around 230 natural gas hydrate deposits worldwide, with at least 1.5 × 10 15 m 3 of natural gas deposits . Natural gas hydrates are formed in the continental margins (∼97%) at a sea bed in the depth ranges of 800–4000 m and permafrost regions (∼3%) (polar areas) characterized by low temperature .…”

Section: Theorymentioning

confidence: 99%

Critical Review on Carbon Dioxide Sequestration Potentiality in Methane Hydrate Reservoirs via CO₂–CH₄ Exchange: Experiments, Simulations, and Pilot Test Applications

et al. 2023

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Many researchers have investigated the potential of methane hydrate reservoirs (MHRs) for carbon dioxide (CO2) sequestration and methane (CH4) production through the CO2–CH4 replacement method. This technique is not yet commercially implemented due to various limitations, especially economic reasons. This study investigated recent advancements in MHRs potentiality for CO2 sequestration through CO2 or mixed gas exchange injection while recovering CH4. From the experiments, modeling, and simulations, and one pilot test conducted, it was found that there is a great potentiality of sequestrating CO2 in MHRs while recovering CH4. In addition, it was revealed that to produce more CH4, the nitrogen/hydrogen (N2/H2) mole fraction in the injector gas stream should be more significant than that in CO2, while to sequestrate more CO2, the CO2 mole fraction in the injector gas stream should be greater than the N2/H2 mole fraction. The CO2–mixture gases mole fraction ratio recommended from one successful pilot test conducted was 23:77 (CO2/N2), which revealed that approximately 60% of injected CO2 was sequestrated with 855 × 103 standard cubic feet of CH4 produced. The challenges identified in this review will urge researchers to explore suitable technologies to conduct more pilot tests and pave the way toward entire field operations on CO2 sequestration in MHRs toward decarbonization.

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“…In addition to the temperature and pressure changes, destabilization of gas hydrates can result from reactions with various organic or inorganic chemical agents that inhibit hydrate formation: salts, acids, and other compounds [21][22][23][24][25][26][27][28]. The effect of dissolved salts on the pressure and temperature limits of hydrate stability has received much attention [21,23,[29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Migration of Salt Ions in Frozen Hydrate-Saturated Sediments: Temperature and Chemistry Constraints

et al. 2022

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Migration of dissolved salts from natural (cryopeg brines, seawater, etc.), or artificial sources can destabilize intrapermafrost gas hydrates. Salt transport patterns vary as a function of gas pressure, temperature, salinity, etc. The sensitivity of the salt migration and hydrate dissociation processes to ambient temperature and to the concentration and chemistry of saline solutions is investigated experimentally on frozen sand samples at a constant negative temperature (−6 °С). The experiments show that the ambient temperature and the solution chemistry control the critical salt concentration required for complete gas hydrate dissociation. Salt ions migrate faster from more saline solutions at higher temperatures, and the pore moisture can reach the critical salinity in a shorter time. The flux density and contents of different salt ions transported to the samples increase in the series Na2SO4–KCl–CaCl2–NaCl–MgCl2. A model is suggested to account for phase transitions of pore moisture in frozen hydrate-saturated sediments exposed to contact with concentrated saline solutions at pressures above and below the thermodynamic equilibrium, in stable and metastable conditions of gas hydrates, respectively.

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Temperature Variation during Salt Migration in Frozen Hydrate-Bearing Sediments: Experimental Modeling

Cited by 5 publications

References 46 publications

Exothermic characteristics research of chemical self-heating solution in the gas hydrate exploitation process

Exothermic characteristics research of chemical self-heating solution in the gas hydrate exploitation process

Critical Review on Carbon Dioxide Sequestration Potentiality in Methane Hydrate Reservoirs via CO₂–CH₄ Exchange: Experiments, Simulations, and Pilot Test Applications

Migration of Salt Ions in Frozen Hydrate-Saturated Sediments: Temperature and Chemistry Constraints

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Temperature Variation during Salt Migration in Frozen Hydrate-Bearing Sediments: Experimental Modeling

Cited by 5 publications

References 46 publications

Exothermic characteristics research of chemical self-heating solution in the gas hydrate exploitation process

Exothermic characteristics research of chemical self-heating solution in the gas hydrate exploitation process

Critical Review on Carbon Dioxide Sequestration Potentiality in Methane Hydrate Reservoirs via CO2–CH4 Exchange: Experiments, Simulations, and Pilot Test Applications

Migration of Salt Ions in Frozen Hydrate-Saturated Sediments: Temperature and Chemistry Constraints

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Critical Review on Carbon Dioxide Sequestration Potentiality in Methane Hydrate Reservoirs via CO₂–CH₄ Exchange: Experiments, Simulations, and Pilot Test Applications