Formation of the impermeable layer in the process of methane hydrate dissociation in porous media

Tsypkin, G. G.

doi:10.1134/s0015462817050076

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…117,169,170 The substitution reaction of CH 4 by CO 2 in clathrates at a higher injection rate is described by a new mathematical model created by Tsypkin. 124,171 The problem was formulated by considering the thermodynamics of gas conversion, framing the basic equations, and then applying the boundary conditions for the exchange reaction. The carbon dioxide injection temperature was set such that it could cause CH 4 hydrate dissociation.…”

Section: Analytical Studies On the Exchange-based Production Methodmentioning

confidence: 99%

Review and Perspectives of Energy-Efficient Methane Production from Natural Gas Hydrate Reservoirs Using Carbon Dioxide Exchange Technology

et al. 2023

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Natural gas hydrates are unconventional abundant hydrocarbon energy resources that can guarantee energy sustainability with little environmental impact. The solid nature of the resource, distinct thermodynamic characteristics, and accumulations at shallow depths make the existing conventional production techniques unviable. Among all the currently explored production techniques, the hydrate-based carbon capture and sequestration (HBCCS) technique is expected to improve production, proven to be geomechanically safer, and conceptualized to be environmentally friendly. In this carbon-neutral production concept, carbon emissions are effectively sequestered for the long-term. This review presents a comprehensive overview and perspective of the CO 2 exchange-based approach to extract methane (CH 4 ) from naturally occurring gas hydrate reserves, emphasizes its prospect as a suitable alternative according to the current energy demands and climate concerns, establishes its environmental and production challenges, and demonstrates the recent developments. This review focuses on the production aspect and discusses the mechanism of the exchange process, experimental and modeling studies, various in situ production tests using different techniques on multiple sediments, and production challenges associated with the exchange process. The aspects of geomechanics and possibilities of fracturing in hydrate reservoirs are also discussed elaborately. A suitable and effective technique is yet to be established to produce natural gas commercially by addressing the existing challenges like sand production, seafloor stability concerns, marine ecosystem problems, low production rate, uncontrolled dissociation, water production, etc. Although the CO 2 exchange-based method is thermodynamically favorable, rapid crystallization of CO 2 restricts mass transfer and prevents continuous exchange. The exchange process is also influenced by heat, salinity, residual water saturation, exchange gas composition, injection phase, injection pressure, sediment properties, etc. There is a need to study the CO 2 −CH 4 exchange process at a fundamental level and at a larger scale, to understand its intricacies. In tandem with comprehensively discussing the subject, this review has listed the issues that require tenable solutions, which shall be helpful to readers who wish to work on production from CH 4 hydrates using the CO 2 exchange process. Methane hydrates shall be one of the strategic energy sources to meet our growing energy requirements for a sustainable future.

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Section: Analytical Studies On the Exchange-based Production Methodmentioning

confidence: 99%

Review and Perspectives of Energy-Efficient Methane Production from Natural Gas Hydrate Reservoirs Using Carbon Dioxide Exchange Technology

et al. 2023

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“…Conjugate modelling of the polymer plates combustion was carried out in [207,208]. Discrete elements method (DEM) models for melting particles sintering in a metallurgical furnace were considered in [209,210] and for sintering of ice particles in [205,211,212]. The formation of ash deposits on the pipes was considered in [213][214][215], and channel clogging problems were studied numerically in [216,217].…”

Section: Filtration In Reactive Mediamentioning

confidence: 99%

Particle Agglomeration of Biomass and Plastic Waste during Their Thermochemical Fixed-Bed Conversion

Donskoy

2023

Energies

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The article provides state-of-the-art research on agglomeration processes during fixed-bed combustion and gasification of low-grade fuels such as biomass and waste (primarily plastic-containing waste). Such fuels demonstrate complex thermal behaviour: their decomposition and combustion are multistage, accompanied by phase transitions, and may lead to fixed-bed mechanical instability and the non-uniformity of air distribution over the cross-section. To clarify the role of physicochemical factors (fuel composition and properties, reactor conditions), data from different sources are compared. The review shows that the fixed-bed agglomeration regimes can, in a rough approximation, be classified by the sintering mechanism (due to the melting of the mineral part or the organic part), with the following search for each mechanism realisation conditions by comparing the fuel properties and characteristic temperatures. Attempts to theoretically describe and numerically simulate the agglomeration phenomenon as a change in the structure of a reacting dispersed medium are also considered: the main directions in which such approaches can be developed are indicated.

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“…The applied researches mainly involved studies on dynamics of NGH dissociation. And they were directed toward the dynamic simulation of hydrate dissociation in pipelines and real hydrate dissociation in porous media [24][25][26]. Sun and Mohanty [27] developed a simulator for methane hydrate formation and dissociation in porous media with the system of gas and ice consideration.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics of Offshore Natural Gas Hydrate Dissociation by Depressurization in Marine Sediments

Liu

Wu³

2019

Geofluids

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Dynamic characteristics of offshore natural gas hydrate (NGH) dissociation will provide the theoretical basis to analyze technical issues of oceanic hydrate exploitation. A mathematical model is developed to simulate offshore NGH dissociation by depressurization in marine sediments. Different phase combination statuses are involved in the process of NGH dissociation by taking ice melting and water freezing into account. The proposed methodology can analyze the processes of hydrate and water phase transitions, decomposition kinetics and thermodynamics, viscosity and permeability, ice-water phase equilibrium, and natural gas and water production. A set of an experimental system is built and consists of one 3-D visual reactor vessel, one isothermal seawater vessel, one natural gas and water separator, and one data acquisition unit. The experiments on offshore NGH dissociation by depressurization in 3-D marine sediments are carried out, and this methodology is validated against the full-scale experimental data measured. The results show that during the prophase, natural gas flow is preceded by water flow into the production wellbore and natural gas occupies more continuous flow channels than water under a large pressure gradient. Then, the natural gas flow rate begins to decline accompanied by an increase of water production. During the second phase, natural gas flow rate decreases slowly because of the decreased temperature of hydrate-bearing formation and low pressure gradient. The lower the intrinsic permeability in marine sediments, the later the water flow rate reaches the peak production. And the space interval of the production wellbore should be enlarged by an increase of the intrinsic permeability. The stable period of natural gas production enhances, and the water flow rate reduces with the increase of bottom-hole pressure in production wellbores. The main reason is the slow offshore NGH dissociation under the low producing pressure and the restriction of heat conductivity under the low temperature.

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Formation of the impermeable layer in the process of methane hydrate dissociation in porous media

Cited by 6 publications

References 12 publications

Review and Perspectives of Energy-Efficient Methane Production from Natural Gas Hydrate Reservoirs Using Carbon Dioxide Exchange Technology

Review and Perspectives of Energy-Efficient Methane Production from Natural Gas Hydrate Reservoirs Using Carbon Dioxide Exchange Technology

Particle Agglomeration of Biomass and Plastic Waste during Their Thermochemical Fixed-Bed Conversion

Dynamic Characteristics of Offshore Natural Gas Hydrate Dissociation by Depressurization in Marine Sediments

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