A well-test model for gas hydrate dissociation considering a dynamic interface

Chen, Zhiming; Li, Dexuan; Zhang, Shaoqi; Liao, Xinwei; Zhou, Biao; Chen, Duo

doi:10.1016/j.fuel.2021.123053

Cited by 11 publications

(5 citation statements)

References 35 publications

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“…6 shows the heat flux at burning boundary and the solid-liquid interface at ratios of oxygen-fuel of 0.5, 1.0 and 2.0, and the interfacial heat flux is calculated by Eq (1). According to Li et al [23,24,25,26],…”

Section: Interfacial Thermal Transport At Different Ratios Of Oxygen-...mentioning

confidence: 99%

“…Wu et al [22] studied the decomposition of methane hydrate coupled with chemical inhibitors and thermal stimulus and found that the accelerated effect of alcohol on accelerating the decomposition of hydrate is very obvious. With the development of the study on gas hydrate, the attention has gradually shifted from the characterization of the process of decomposition of hydrate to the interface generated by decomposed hydrate [23,24,25,26], which is formed due to the phase transition in the process of decomposition. The interface is the heart of thermal transport because the dissociation of hydrate is carried out under the combined action of heat and mass transfer [24].…”

Section: Introductionmentioning

confidence: 99%

“…The dissociation of methane hydrate with burning is more complicated, and the liquid water from decomposed hydrate is contact in direct with free gas to produce a gas-liquid interface, the outer side of which is the area of burning methane, and the interface is defined as burning boundary. Accurate positioning of solid-liquid interface and burning boundary is the basis for exploring interfacial thermal transport, and these researches [23,24,25,26] provide valuable perspectives for locating interfaces.…”

Section: Introductionmentioning

confidence: 99%

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Interfacial thermal transport in combustion-dissociation process at different environments for methane hydrate

Meng,

Han,

Yuan

et al. 2024

Preprint

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Currently, there is a considerable lack of research on the dissociation of methane hydrate combustion at the microscopic level. In this study, ReaxFF molecular dynamics simulations were used to accurately locate the phase transition interface during methane hydrate combustion-dissociation, and the interfacial heat transport was analyzed for different oxygen-fuel ratios and different combustion atmospheres. The time evolution of interfacial heat flux, interfacial thermal resistance and combustion production is extracted, finding that different ratios of oxygen-fuel and combustion atmospheres have different degrees of influence on the combustion-decomposition of hydrate. The larger ratio of oxygen-fuel, the greater the heat flux at solid-liquid interface, and the faster the dissociation rate of hydrate. Combustion is carried out more stably at the ratio of oxygen-fuel of 0.5. The value of solid-liquid interfacial heat flux at different atmospheres is O2/CO2 > O2/CH4 > O2. During the entire decomposition, the heat flux of burning boundary is greater than the solid-liquid interface under O2/CH4 atmosphere, lasting for about 1600 fs, which is 2.3 times than the pure O2 atmosphere. The heat flux of two interfaces at O2/CO2 atmosphere is the same, and the reactivity of CO2 plays a critical role in the decomposition driving of hydrate by reaction of CO2 + H→CO + OH at high temperature. The study reveals the heat and mass transfer mechanism of the combustion-dissociation process of methane hydrate under different combustion environments, which is of theoretical guidance for the stable combustion and controlled decomposition of hydrate.

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Section: Interfacial Thermal Transport At Different Ratios Of Oxygen-...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interfacial thermal transport in combustion-dissociation process at different environments for methane hydrate

Meng,

Han,

Yuan

et al. 2024

Preprint

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“…) where u is the Laplace variable, and ξ refers to the pressure after Pedrosa substitution. Following the works of Goel et al (2001) and Chen et al (2022), the time-varying distance of moving dissociated interface in an NGH reservoir is:…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Their proposed analytical solution used a moving boundary to separate the dissociated and non-dissociated regions. Chen et al (2022) proposed an analytical vertical well model in NGH reservoirs; the typical flow regimes are identified by pressure behavior. In summary, current analytical and semi-analytical models of NGH focus on vertical wells.…”

Section: Introductionmentioning

confidence: 99%

A new semi-analytical flow model for multi-branch well testing in natural gas hydrates

Chu

Zhang

et al. 2023

Adv. Geo-Energy Res.

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This paper presents a new semi-analytical solution and the related methodology to analyze the pressure behavior of multi-branch wells produced from natural gas hydrates. For constant bottom-hole pressure production, the transient flow solution is obtained by Laplace transforms. The interference among various branches is investigated using the superposition principle. A simplified form of the proposed model is validated using published analytical solutions. The complete flow profile can be divided into nine distinct regimes: wellbore storage and skin, vertical radial flow, linear flow, pseudo-radial flow, composite flow, dissociated flow, transitional flow, improvement flow and stress-sensitive flow. A well's multi-branch structure governs the vertical radial and the linear flow regimes. In our model, a dynamic interface divides the natural gas hydrates deposit into dissociated and non-dissociated regions. Natural gas hydrates formation properties govern the compositeeffect, dissociated, transitional, and improvement flow regimes. A dissociation coefficient governs the difference in flow resistance between dissociated and non-dissociated natural gas hydrates regions. The dissociated-zone radius affects the timing of these flow regimes. Conversion of natural gas hydrates to natural gas becomes instantaneous as the dissociation coefficient increases. The pressure derivative exhibits the same features as a homogeneous formation. The natural gas hydrates parameter values in the Shenhu area of the South China Sea cause the prominent dissociated flow regime to conceal the later transitional and improvement flow regimes. Due to the maximum practical well-test duration limitation, the first five flow regimes (through composite flow) are more likely to appear in practice than later flow regimes.

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Rate transient analysis for multilateral horizontal well in natural gas hydrate: superposition principle and reciprocity

Ma,

Chu,

et al. 2024

Int J Coal Sci Technol

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Due to high energy density, clean combustion products and abundant resources, natural gas hydrates (NGHs) have been regarded as an important clean energy source with the potential for large-scale development and utilization. However, pilot tests in NGHs show that their production rates are far below commercial needs. Multilateral well technology may lead to a solution to this problem because it can dramatically expand the drainage area of production wells. This paper presents the practical rate transient analysis for multilateral horizontal wells in NGHs. In developing solution to the diffusivity equation of multilateral horizontal wells in NGHs, the superposition principle and reciprocity are applied. We wrote the governing equation in cylindrical coordinates to describe the NGH flow process. We used the moving boundaries and dissociation coefficients to model the solid-to-gas transition process in hydrates. To obtain solutions for flow in hydrate reservoirs, we used Laplace transforms and the Stehfest numerical inversion method. Superposition principle and Gaussian elimination are applied to obtain the desired solution for multilateral horizontal wells. We validated our proposed model with a commercial numerical simulator. By performing sensitivity analyses, effects on production behavior of the number of branches, dissociation coefficient, radius of the region with dissociated hydrate, and dispersion ratio are determined. A synthetic case study is conducted to show the typical production behaviors.

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A well-test model for gas hydrate dissociation considering a dynamic interface

Cited by 11 publications

References 35 publications

Interfacial thermal transport in combustion-dissociation process at different environments for methane hydrate

Interfacial thermal transport in combustion-dissociation process at different environments for methane hydrate

A new semi-analytical flow model for multi-branch well testing in natural gas hydrates

Rate transient analysis for multilateral horizontal well in natural gas hydrate: superposition principle and reciprocity

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