Comprehensive effects of heat and flow on the methane hydrate dissociation in porous media

Zhang, Zhaobin; Xu, Tao; Li, Shouding; Li, Xiao; Montilla, Maryelin Josefina Briceño; Lü, Cheng

doi:10.1016/j.energy.2022.126425

Cited by 23 publications

(12 citation statements)

References 69 publications

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“…In the case of thermal flow stimulation in this work, the dissociation of methane hydrate in porous media is a heat-flow coupling process. In this process, the dissociation rate of methane hydrate is related to the fluid flow resistance and heat supplement . In this work, the same injection temperature was chosen, which means that there is no difference in the heat supply for the two samples; therefore, the rate of hydrate dissociation is mainly determined by the seepage capacity.…”

Section: Resultsmentioning

confidence: 99%

“…In this process, the dissociation rate of methane hydrate is related to the fluid flow resistance and heat supplement. 20 In this work, the same injection temperature was chosen, which means that there is no difference in the heat supply for the two samples; therefore, the rate of hydrate dissociation is mainly determined by the seepage capacity. For the sediment with a larger particle size, the higher permeability means lower fluid flow resistance.…”

Section: Comparison Of Mh Thermal Dissociation For S1 and S2mentioning

confidence: 99%

“…However, as a result of the challenging geological environments, when drilling in the hydrate-bearing formations submerged in deep water, MHs may be partly dissociated due to the heat transfer between the thermal drilling fluids and gas hydrates. , The dissociation can result in wellbore instabilities, sediment deformation, and fine migration, leading to complicate and severe troubles in drilling and production operations. − Regarding MH production, depressurization is considered as the most economically feasible technology. , However, ice and secondary hydrate formation may occur and block the flow channel to reduce the gas/fluid production during the dissociation process when the depressurization method is used individually because the hydrate decomposition is an endothermic reaction. − Thermal-stimulation technology is an effective method to promote hydrate dissociation. Regarding the thermal-stimulation method, improving the thermal efficiency and energy ratio is the key, which is considered to be related to heat supply and heat transfer. − Consequently, it is essential to clarify the heat flow-induced decomposition in different hydrate systems. MH formation and decomposition behaviors in a bulk phase were investigated by numerous researchers. − However, the evolution mechanism of MH formation/decomposition in sediments can be different owing to the intricate hydrate–gas–water phase transition and heat transfer processes .…”

Section: Introductionmentioning

confidence: 99%

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NMR Investigation of Methane Hydrate Formation and Dissociation Behavior Induced by Heat Flow in Sandy Porous Media

Li,

Huang,

Sun

et al. 2024

Energy Fuels

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Clarifying the heterogeneity of methane hydrate (MH) formation and decomposition induced by heat flow in different hydrate deposits is of critical importance for gas hydrate drilling and exploitation operations. In this paper, two sand packing samples with different sizes of 250−270 and 96−109 μm, respectively, were adapted to prepare hydratebearing sediments (HBSs), and a low-field nuclear magnetic resonance (LF-NMR) system was employed and modified by combining a gas/water two-phase flow system to quantitatively and visually study the heterogeneity of MH formation/dissociation in the two sand samples during the heat flow invasion. Results showed that methane hydrate formed heterogeneously in porous media, and MH formation rates were negatively correlated with the particle sizes of the sediments. In the whole process of heat injection, uneven distributions of hydrate saturation with low left and high right were shown in the two samples, suggesting that it was difficult for the heat to transfer over long distances. In this process, the dissociation rate of methane hydrate was related to the fluid flow resistance and heat supplement simultaneously, and hydrate decomposition induced by heat stimulation could be accelerated with the increase in the size of quartz sand, which was composed of HBSs. Additionally, the hydrate dissociation fronts expanded with distinct patterns for the hydrate sediments with different sand sizes. When hot water was injected into the HBS filled with larger grains, MH preferentially dissociated in the bottom and inlet parts of the chamber, and the MH decomposition front expanded with a wedge-shaped pattern. In the sediment with smaller grain size, MH was given priority to dissociate from the middle to the edge sides along the coronal planes (X−Z planes) because injected water could be hindered to transfer along a radial direction by the tight seepage channel.

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Section: Resultsmentioning

confidence: 99%

Section: Comparison Of Mh Thermal Dissociation For S1 and S2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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NMR Investigation of Methane Hydrate Formation and Dissociation Behavior Induced by Heat Flow in Sandy Porous Media

Li,

Huang,

Sun

et al. 2024

Energy Fuels

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“…The recorded gas production and production rates are depicted in Figure , demonstrating a good agreement with the results. Further detailed analysis and validation have been published in relevant articles. , …”

Section: Materials and Methodologiesmentioning

confidence: 99%

“…Further detailed analysis and validation have been published in relevant articles. 13,43 Rutqvist et al 40,44 conducted a settlement analysis on the HBS gas production case in the Gulf of Mexico through the secondary development of FLAC3D and TOUGH + hydrate (hereafter named HydrateFLAC). Jin et al 32 verified the results of this research on the hydrateBiot developed by Jilin University, and the verification results were relatively consistent.…”

Section: Simulator Verificationmentioning

confidence: 99%

Numerical Investigation of the Depressurization Exploitation Scheme of Offshore Natural Gas Hydrate: Enlightenments for the Depressurization Amplitude and Horizontal Well Location

Zhang

et al. 2023

Energy Fuels

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According to the recent test mining of marine natural gas hydrate (NGH), extensive indoor experimental and numerical simulation studies, depressurization is regarded as a relatively economical and mature choice. For the characteristics of NGH-bearing sediments, seabed settlement during the NGH exploitation process is inevitable. It is crucial to work on designing the hydrate exploitation scheme according to the gas production efficiency and subsidence. NGH production involves intricate thermal–hydrodynamic–mechanical phenomena, necessitating the use of numerical simulation tools to evaluate associated geo-mechanical responses. The self-developed numerical simulator repeats the previous research of relevant scholars and verifies the accuracy of the model. Based on the logging data of the Shenhu Sea area in the South China Sea, the research model is established. We investigated the case simulation of long-term production using the horizontal well depressurization method by adjusting the target pressure and wellbore location. The results show that increasing the depressurization amplitude can not only significantly improve the production efficiency but also increase the settling effect of the seabed formation. Increasing the wellbore layout depth can fully use the temperature and pressure conditions of the hydrate reservoir itself, thereby improving production efficiency. However, it also expands the scope of the overall settlement. In addition, it should also pay attention to the boundary effect between the decomposition range of hydrate and the overburden and underburden. The initial findings showcased in this research could enhance our comprehension of production and geomechanical behavior in the process of hydrate mining in the sea area and have a particular guiding significance for future mining scheme design.

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Optimization of the natural gas hydrate hot water injection production method: Insights from numerical and phase equilibrium analysis

Zhang,

Li,

et al. 2024

Applied Energy

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Comprehensive effects of heat and flow on the methane hydrate dissociation in porous media

Cited by 23 publications

References 69 publications

NMR Investigation of Methane Hydrate Formation and Dissociation Behavior Induced by Heat Flow in Sandy Porous Media

NMR Investigation of Methane Hydrate Formation and Dissociation Behavior Induced by Heat Flow in Sandy Porous Media

Numerical Investigation of the Depressurization Exploitation Scheme of Offshore Natural Gas Hydrate: Enlightenments for the Depressurization Amplitude and Horizontal Well Location

Optimization of the natural gas hydrate hot water injection production method: Insights from numerical and phase equilibrium analysis

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