Enhancement of gas production from methane hydrate reservoirs by the combination of hydraulic fracturing and depressurization method

Feng, Yongchang; Chen, Lin; Suzuki, Anna; Kogawa, Takuma; Okajima, Junnosuke; Komiya, Atsuki; Maruyama, Shigenao

doi:10.1016/j.enconman.2019.01.050

Cited by 153 publications

(87 citation statements)

References 41 publications

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“…Therefore, different water molecule models are needed to simulate separately. In the future research, it is still an open research field to explore the water model applicable to the study of NGH in different thermodynamic states (2) The research on the nucleation mechanism of hydrate at the gas-water interface shows that under the conditions of supercooling, high pressure, and gas supersaturation, hydrates are more easily formed. However, the experimental results show that the surface properties of the sediments (such as crystallinity and hydrophilicity) may also influence the formation of hydrates.…”

Section: Discussionmentioning

confidence: 99%

“…NGH is an ice-like solid substance formed by the combination of natural gas (mainly methane) with water under high pressure and low temperature, generally distributed in deep-sea sediments or permafrost [1,2]. As a new energy source in the future, NGH has the advantages of large reserves, wide distribution, low pollution, and high energy density.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Overview of Molecular Dynamics Simulation of Natural Gas Hydrate at Nanoscale

Qin

Bian

et al. 2021

Geofluids

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As a dynamic research method for molecular systems, molecular dynamic (MD) simulation can represent physical phenomena that cannot be realized by experimental means and discuss the microscopic reaction mechanism of things from the molecular level. In this paper, the previous research results were reviewed. First, the MD simulation process was briefly described, then, the applicability of different molecular force fields in the natural gas hydrate (NGH) system was discussed, and finally, the application of MD simulation in the formation and decomposition law of NGH was summarized from the perspective of NGH mining. The results show that the selection of water molecular force field has a great influence on the simulation results, and the evaluation of water model applicable to the simulation of NGH under different thermodynamic states is still an open research field that needs to be paid attention to. The effect of surface properties of porous media (such as crystallinity and hydrophilicity) on hydrate needs to be further studied. Compared with thermodynamic inhibitors, kinetic inhibitors (such as amino acids) have more promising research prospects, and further research can be carried out in the screening of efficient kinetic inhibitors in the future.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Overview of Molecular Dynamics Simulation of Natural Gas Hydrate at Nanoscale

Qin

Bian

et al. 2021

Geofluids

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“…Therefore, the accurate prediction of hydrate formation region in wellbores is very important to ensure the safety of deep-water drilling. It is necessary to make a comprehensive and in-depth study of wellbore temperature fields and pressure fields under different drilling parameters to accurately and reliably predict the hydrate formation region in wellbores of deep-water drilling, as the formation of natural gas hydrate is mainly affected by temperature and pressure (John et al, 1985;Sloan, 2003;Demirbas, 2010;Feng et al, 2019;Kvamme, 2019).…”

Section: Introductionmentioning

confidence: 99%

Wellbore Temperature and Pressure Field in Deep-water Drilling and the Applications in Prediction of Hydrate Formation Region

et al. 2021

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In the process of deep-water drilling, gas hydrate is easily formed in wellbores due to the low temperature and high pressure environment. In this study, a new, systematic, and accurate prediction method of temperature, pressure, and hydrate formation region in wellbores is developed. The mathematical models of wellbore pressure and transient heat transfer are established, the numerical solution method based on fully implicit finite difference method is developed, and the accuracy is verified by comparing with the field measured data. Combined with the hydrate phase equilibrium model, the hydrate formation region in wellbore is predicted, and the sensitivity effects of nine factors on wellbore temperature, pressure, and hydrate formation region are analyzed. Finally, the influence regularities and degree of each parameter are obtained. The increases of circulation time, geothermal gradient, displacement of drilling fluid, and injection temperature will inhibit the formation of hydrate in wellbores, and the influence degree increases in turn; the increases of wellhead backpressure and seawater depth will promote the formation of hydrate in wellbores, and the influence degree increases in turn. The changes of drilling fluid density, well depth, and hole deviation angle have little effect on the formation of hydrate in wellbores.

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“…Researches using the TOUGH-Fx/HYDRATE simulator reported low gas production from dispersed oceanic MH reservoirs with low hydrate saturation upon depressurization, accompanied by high water production, suggesting that gas production from such reservoirs is not economically feasible [53]. Increasingly, MH reservoirs are attracting researchers, who study them deeply through mathematical tools as well as real field or experimental work [54][55][56][57][58][59][60][61].…”

Section: Introductionmentioning

confidence: 99%

Analytical investigation of gas production from methane hydrates and the associated heat and mass transfer upon thermal stimulation employing a coaxial wellbore

Roostaie

Leonenko

2020

Energy Conversion and Management

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In this study, a radial 2D analytical approach has been developed to couple the wellbore heating process and the associated methane hydrate dissociation in the reservoir. A coaxial wellbore is assumed as the heat source where both conduction and convection heat transfers are considered. It consists of an inner tube and an outer structure of casing, gravel, and cement layers. In the reservoir, a similarity solution employing a moving boundary separating the dissociated and undissociated zones is employed to build the analytical solution. Two different operating schemes for water supply into wellbore heat source have been studied: i) from the inner tube; and ii) from the annulus section of the wellbore. Temperature distribution along the wellbore, temperature and pressure distributions in the reservoir, hydrate dissociation rate, and energy efficiency considering various initial and boundary conditions and reservoir properties are evaluated. The two different operating schemes have almost the same results with slightly higher gas production in the case of hot water entry into annulus, which is in direct contact with the reservoir. Increasing the inlet water temperature or decreasing the wellbore pressure increases gas production. Applying them simultaneously results in a greater gas production and energy efficiency. Some of the reservoir's properties, such as porosity, thermal diffusivity, thermal conductivity, and reservoir thickness, have direct relation with the dissociation rate, but the reservoir's permeability and gas viscosity have almost no impact on the process. The wellbore parameters, such as flow rate of hot water, inlet temperature, and wellbore radius except the inner tube radius, have direct impact on the wellbore mean temperature and the associated results in the dissociation process.

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Enhancement of gas production from methane hydrate reservoirs by the combination of hydraulic fracturing and depressurization method

Cited by 153 publications

References 41 publications

Overview of Molecular Dynamics Simulation of Natural Gas Hydrate at Nanoscale

Overview of Molecular Dynamics Simulation of Natural Gas Hydrate at Nanoscale

Wellbore Temperature and Pressure Field in Deep-water Drilling and the Applications in Prediction of Hydrate Formation Region

Analytical investigation of gas production from methane hydrates and the associated heat and mass transfer upon thermal stimulation employing a coaxial wellbore

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