Heat transfer analysis of methane hydrate dissociation by depressurization and thermal stimulation

Wan, Qing-Cui; Si, Hu; Li, Bo; Li, Gang

doi:10.1016/j.ijheatmasstransfer.2018.07.016

Cited by 69 publications

(36 citation statements)

References 39 publications

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“…Furthermore, data from several studies suggest that the wellbores in the production region mainly consisted of three layers: casing, cement, and gravel (Florez Anaya and Osorio, 2014;Pucknell and Mason, 1992;Xu et al, 2014). On the other hand, among previous mathematical works that have been done in the field of hydrate dissociation up to now (Li et al, 2010;Li et al, 2012a;Wan et al, 2018;Zhao et al, 2016), no analytical study has investigated the impact of heat source structure (i.e., wellbore radius and the associated outer layers) on dissociation upon thermal stimulation using wellbore heating, which might induce unreliable outcomes while comparing to those from experiments or field works. Existing research addresses this gap and recognizes the critical role played by the wellbore structure in hydrate dissociation via wellbore heating.…”

Section: Introductionmentioning

confidence: 99%

Analytical modeling of methane hydrate dissociation under thermal stimulation

Roostaie

Leonenko

2020

Journal of Petroleum Science and Engineering

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In this study, a one-dimensional analytical model to describe heat and mass transfer during methane hydrate dissociation under thermal stimulation in porous media has been developed. The model is based on a similarity solution that considers a moving dissociation boundary which separates the dissociated zone containing produced gas and water from the un-dissociated zone containing only methane hydrate. The results of temperature distribution, pressure distribution, energy efficiency, and parametric study considering various initial and boundary conditions as well as various reservoir properties are presented and compared with previous studies. Sensitivity analysis of gas production on reservoir properties is also presented in this paper. The dissociation boundary moves faster by increasing the heat source temperature while decreasing the heat source pressure simultaneously, but the associated energy efficiency decreases. Increasing the well thickness has a negative effect on the energy efficiency of the process. Among the proposed thermal properties of the system, only the thermal diffusivities and conductivites of the reservoir as well as the porosity of the sediment affect the dissociation. The main contribution of this work is investigating analytically the hydrate dissociation using thermal stimulation by taking into account the effect of wellbore thickness and structure.

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Section: Introductionmentioning

confidence: 99%

Analytical modeling of methane hydrate dissociation under thermal stimulation

Roostaie

Leonenko

2020

Journal of Petroleum Science and Engineering

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“…The interdependent physical and chemical processes of heat and four substances, including hydrate, methane, water, and chemical inhibitors, can be described by this code in four kinds of states (i.e., aqueous liquid, gas, hydrate, and ice). Confidence in the adoption of this code for the modeling and forecasting of methane hydrate phase transition properties grows with successful experimental validations in various laboratory-scale hydrate deposits [ 15 , 16 , 22 , 28 ]. However, the irreversibilities during hydrate development have not been considered in this code due to the absence of a reliable entropy production model.…”

Section: Experimental and Numerical Simulationsmentioning

confidence: 99%

“…For the sake of efficient energy recovery from gas hydrates, several solutions have been suggested based on the principle of destructing the stability situations of NGH systems for fluid extraction [ 15 ], including the depressurization [ 16 , 17 , 18 , 19 ], the thermal stimulation [ 20 , 21 , 22 ], the inhibitor injection [ 23 , 24 , 25 ], and the gas exchange method [ 26 , 27 ]. Due to the technical simplicity and the low external energy demand of the depressurization method, it is widely recognized as the simplest and most promising strategy for hydrate exploitation [ 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

“…It was found that a part of the dissociation heat was provided by the hydrate deposit in the form of sensible heat decline, and this process was affected by the content of water in the pores and the composition of the porous media. Wan et al [ 15 , 31 ] quantitatively calculated various heat flows during hydrate mining under different conditions of depressurizing and wellbore heating in a high-pressure vessel. The heat conducted from the constant-temperature boundary was found to promote the dissociation in the early stage, and it would be weakened quickly once the injected heat played a more dominating role.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation into the Development Performance of Gas Hydrate by Depressurization Based on Heat Transfer and Entropy Generation Analyses

Wei

Wan

et al. 2020

Entropy

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The purpose of this study is to analyze the dynamic properties of gas hydrate development from a large hydrate simulator through numerical simulation. A mathematical model of heat transfer and entropy production of methane hydrate dissociation by depressurization has been established, and the change behaviors of various heat flows and entropy generations have been evaluated. Simulation results show that most of the heat supplied from outside is assimilated by methane hydrate. The energy loss caused by the fluid production is insignificant in comparison to the heat assimilation of the hydrate reservoir. The entropy generation of gas hydrate can be considered as the entropy flow from the ambient environment to the hydrate particles, and it is favorable from the perspective of efficient hydrate exploitation. On the contrary, the undesirable entropy generations of water, gas and quartz sand are induced by the irreversible heat conduction and thermal convection under notable temperature gradient in the deposit. Although lower production pressure will lead to larger entropy production of the whole system, the irreversible energy loss is always extremely limited when compared with the amount of thermal energy utilized by methane hydrate. The production pressure should be set as low as possible for the purpose of enhancing exploitation efficiency, as the entropy production rate is not sensitive to the energy recovery rate under depressurization.

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“…However, it should be noted that the wellbore structure can affect the process, such as the heat transfer mechanism during thermal stimulation method. The analytical works conducted about the hydrate dissociation to present [47,[49][50][51] have not considered the impact of wellbore geometry and the associated structure (i.e., wellbore radius and the associated outer layers) on MH dissociation upon thermal stimulation by wellbore heating, which might induce unreliability while comparing to experiments or field works. Recently, Roostaie and Leonenko [52] mathematically overcame this gap of knowledge and showed that the wellbore structure, consisting of layers: casing, gravel, and cement, can also affect the interactions in the reservoir and the efficiency of the process upon thermal stimulation.…”

Section: Introductionmentioning

confidence: 99%

Gas production from methane hydrates upon thermal stimulation; an analytical study employing radial coordinates

Roostaie

Leonenko

2020

Energy

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In this study, a radial analytical model for methane hydrate dissociation upon thermal stimulation in porous media considering the effect of wellbore structure has been developed. The analytical approach is based on a similarity solution employing a moving boundary separating the dissociated and undissociated zones. Two different heat sources are considered: i) line heat source; and ii) wellbore heat source with specific thickness consisting of casing, gravel, and cement. The temperature and pressure distributions, dissociation rate, and energy efficiency considering various initial and boundary conditions, and reservoir properties are investigated. Direct heat transfer from the heat source to the reservoir without considering the heat conduction in the wellbore thickness causes higher the dissociation rate and gas production in the line heat source model compared to the wellbore heating model. Increasing the heat source temperature or decreasing its pressure increases gas production. However, employing them simultaneously results in greater gas production but reduces energy efficiency. The dissociation rate has direct relation with porosity, thermal diffusivities, and thermal conductivities of the reservoir, but is not dependent on the reservoir's permeability.

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Heat transfer analysis of methane hydrate dissociation by depressurization and thermal stimulation

Cited by 69 publications

References 39 publications

Analytical modeling of methane hydrate dissociation under thermal stimulation

Analytical modeling of methane hydrate dissociation under thermal stimulation

Numerical Investigation into the Development Performance of Gas Hydrate by Depressurization Based on Heat Transfer and Entropy Generation Analyses

Gas production from methane hydrates upon thermal stimulation; an analytical study employing radial coordinates

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