A novel mathematical method for evaluating the wellbore deformation of a diagenetic natural gas hydrate reservoir considering the effect of natural gas hydrate decomposition

Zhang, Qiangui; Wang, Zhaoxiang; Fan, Xiangyu; Zhao, Jun; Li, Xinwei; Yao, Bowei

doi:10.1016/j.ngib.2021.04.009

Cited by 6 publications

(4 citation statements)

References 28 publications

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“…With the increase of the fractional order at different distances, the temperature will reach the initial heat injection temperature in a shorter time. The variation of temperature with time during the classical hydrate dissociation model was obtained in [2,4]. The fractional-order model is consistent with the classical dissociation model in terms of temperature variation and is an extension of the classical hydrate model.…”

Section: Discussionmentioning

confidence: 53%

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Hydrate Dissociation Model with Time Fractional Derivative

et al. 2022

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In this paper, we shall investigate fractional partial differential equations with fractional moving boundary condition to study the dissociation of natural gas hydrate under heat injection. The moving boundary separates the hydrate reservoir into the dissociated zone and the hydrate one. By using the self-similar transformation and Wright function, we obtain the explicit solutions for two zones. We present simulations with steam and hot water injection and show the dissociation temperature in graphical mode from injection temperature to reservoir temperature with respect to the time, distance, and fractional order. Our analysis of fractional model turns out to be a successful generalization of the classical one; i.e., it can well describe the dissociation of natural gas hydrate and is theoretically consistent with the existing integer hydrate dissociation model. When the factional order tends to 1, the “limit solution” becomes the classical one.

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Section: Discussionmentioning

confidence: 53%

“…An analytical solution was derived, and results were used to evaluate gas production. Later, the authors in [3][4][5][6][7][8] generalized the analytical model to radial symmetric decomposition model, well structure, etc. For hydrate decomposition model solved numerically, we refer to references [9,10] and their related references.…”

Section: Introductionmentioning

confidence: 99%

Hydrate Dissociation Model with Time Fractional Derivative

et al. 2022

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“…Technology for enhancing reservoir permeability has become a focal point of interest, with numerous scholars conducting research in this area using various technical approaches [15]. With the advancement of coal seam fracturing technology, waterless coal seam fracturing, as an emerging technology, has garnered considerable attention.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effect of Freeze-Thaw Cycles on the Mechanical and Permeability Characteristics of Coal

Gao,

Lu,

Zhang

et al. 2023

Sustainability

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The safe and efficient mining of coal seams with low porosity, low permeability, and high heterogeneity under complex geological conditions is a major challenge, with the permeability of coal seams playing a crucial role in coal mine gas extraction. The development of coal seam permeability enhancement technology can help coal mines produce safely and efficiently, while the extracted coal bed methane can be utilized as green energy. To study the effect of freezing and thawing on the evolution of the mechanical and permeability properties of coal, triaxial permeability tests were conducted on low-permeability coal under two different confining pressures. Simultaneously, dry, saturated, and freeze-thaw coal samples were set up for comparison, and the effects of water and freeze-thaw were isolated from each other. The triaxial mechanics and percolation laws of dry, saturated, and freeze-thaw coal rocks were obtained; the results show that saturated coal has the lowest initial permeability, while freeze-thawed coal has the highest initial permeability. Through analyzing the effects produced by water, freezing and thawing on coal specimens, the mechanism of the influence of freeze-thaw on the permeability evolution of coal was revealed. The research results can provide theoretical guidance for the development of gas extraction technology for low-permeability coal seams.

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“…In addition, mass numerical models were established to illustrate the gas production mechanism from hydrate reservoirs by many scientists and groups from different perspectives. [ 29–31 ] Till now, many investigations and field hydrate production tests have been performed; meanwhile, some novel exploitation methods were proposed continually to enhance gas recovery efficiency. Fortunately, many excellent achievements have been made in the past decades, and there were many reviews to summarize the hydrate area from different angles (such as fundamental research, application, and environmental).…”

Section: Introductionmentioning

confidence: 99%

Research Development in the Traditional Methods and Water Flow Erosion for Natural Gas Hydrate Production: A Review

Sun

Chen

Zhu³

et al. 2022

Energy Tech

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Natural gas hydrates are considered a possible sustainable energy source. Various methods have been proposed and developed in the past few decades to exploit hydrate. The purpose of this paper is to review the research advances, application potential, and limitations of hydrate production methods, including four traditional methods (depressurization, thermal stimulation, inhibitor injection, and CO2 replacement), and novel water flow erosion. For the four traditional methods, there still exist many bottlenecks to achieve commercial hydrate production owing to a series of problems such as vast sand production, ice generation, hydrate reformation, lower energy efficiency, and huge water production. For the water flow erosion method, it can be a novel strategy to promote hydrate decomposition by introducing the chemical potential difference and accelerating mass transfer. Significantly, if the traditional methods assist with water flow erosion, the problems such as insufficient decomposition driving force and ice generation are prevented. However, there is always a gap between the experimental results and the practical application of the water flow erosion method. Therefore, future work should be undertaken to investigate the selection criteria of suitable water flow rates for different reservoirs and the ecological security of the hydrate reservoir during the water flow erosion process.

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A novel mathematical method for evaluating the wellbore deformation of a diagenetic natural gas hydrate reservoir considering the effect of natural gas hydrate decomposition

Cited by 6 publications

References 28 publications

Hydrate Dissociation Model with Time Fractional Derivative

Hydrate Dissociation Model with Time Fractional Derivative

Experimental Study on the Effect of Freeze-Thaw Cycles on the Mechanical and Permeability Characteristics of Coal

Research Development in the Traditional Methods and Water Flow Erosion for Natural Gas Hydrate Production: A Review

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