Insights into scale translation of methane transport in nanopores

Liu, Lingfu; Wang, Yuhang; Aryana, Saman A.

doi:10.1016/j.jngse.2021.104220

Cited by 20 publications

(8 citation statements)

References 55 publications

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“…The relatively reduced flow rate in the pocket channel is due to the surface roughness represented by the series of pocket pores. Similarly, a relevant simulation case study revealing the influence of surface roughness on flow rate shows that the mass flux of methane gas in a nanochannel decreases with increasing surface roughness represented by triangular and rectangular dents …”

Section: Resultsmentioning

confidence: 97%

“…Similarly, a relevant simulation case study revealing the influence of surface roughness on flow rate shows that the mass flux of methane gas in a nanochannel decreases with increasing surface roughness represented by triangular and rectangular dents. 35 To summarize, the influence of channel geometry on the immiscible two-fluid flow dynamics and recovery flow rate has been investigated. The variations in the channel cross section are shown to have a major impact on the evolution of the two-fluid interface as well as flow rate, when the channel inlet and outlet cross sections remain constant.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Insights into Waterflooding in Hydrocarbon-Bearing Nanochannels of Varying Cross Sections from Mesoscopic Multiphase Flow Simulations

Diermyer

Xia

2023

Langmuir

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Waterflooding is one of the geotechniques used to recover fuel sources from nanoporous geological formations. The scientific understanding of the process that involves the multiphase flow of nanoconfined fluids, however, has lagged, mainly due to the complex nanopore geometries and chemical compositions. To enable the benchmarked flow of nanoconfined fluids, architected geomaterials, such as synthesized mesoporous silica with tunable pore shapes and surface chemical properties, are used for designing and conducting experiments and simulations. This work uses a modified many-body dissipative particle dynamics (mDPD) model with accurately calibrated parameters to perform parametric flow simulations for studying the influences of waterflooding-driven power, pore shape, surface roughness, and surface wettability on the multiphase flow in heptane-saturated silica nanochannels. Remarkably, up to an 80% reduction in the effective permeability is found for water-driven heptane flow in a baseline 4.5-nm-wide slit channel when compared with the Hagen–Poiseuille equation. In the 4.5-nm-wide channels with architected surface roughness, the flow rate is found to be either higher or lower than the baseline case, depending on the shape and size of cross sections. High wettability of the solid surface by water is essential for achieving a high recovery of heptane, regardless of surface roughness. When the solid surface is less wetting or nonwetting to water, the existence of an optimal waterflooding-driven power is found to allow for the highest possible recovery. A detailed analysis of the evolution of the transient water–heptane interface in those nanochannels is presented to elucidate the underlying mechanisms that impact or dictate the multiphase flow behaviors.

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Section: Resultsmentioning

confidence: 97%

Section: ■ Results and Discussionmentioning

confidence: 99%

Insights into Waterflooding in Hydrocarbon-Bearing Nanochannels of Varying Cross Sections from Mesoscopic Multiphase Flow Simulations

Diermyer

Xia

2023

Langmuir

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“…The LBM has been successfully utilized in this context 187−189 and has made significant progress in shale gas simulation. 59,174,190 Scholars have made remarkable progress in studying gas transport mechanisms. 19,59,174,190−195 As a mesoscale numerical method, the LBM is capable of effectively simulating gas flow at both the pore scale and the REV scale.…”

Section: Gas Transport Prediction With Lattice Boltzmann Simulationmentioning

confidence: 99%

“…Multiscale modeling has also addressed individual fractures and fracture networks, utilizing the Peng–Robinson equation of state (EOS) within LBM to investigate methane behavior and transport in confined phases within nanopores, as shown in Figure b. The multiple relaxation time–Lattice Boltzmann Method (MRT-LBM) has been employed to study methane transport in nanoporous fissures and pores with complex geometries . These simulations accurately consider intermolecular forces, adsorption effects near solid boundaries, and nonideal fluid behavior.…”

Section: Multiscale Simulation Of Gas Transportmentioning

confidence: 99%

“…The distribution of pore sizes influences the adsorption capacity of gas in coal, while pore connectivity affects the effective diffusion coefficient of the gas in the coal matrix. , There is a need for an approach that can effectively capture the true diffusion characteristics of coalbed methane (CBM). The LBM has been successfully utilized in this context − and has made significant progress in shale gas simulation. ,, …”

Section: Gas Transport Prediction With Lattice Boltzmann Simulationmentioning

confidence: 99%

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Reviews on Simulation Studies of Coalbed Gas Recovery and Transport Processes

Wang,

Lin,

Zhao

2023

Energy Fuels

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Coal and shale contain enormous natural gas resources. The reservoir structures are complex, with an extensive distribution of micropores and nanopores, leading to intricate gas transport mechanisms. Simulation methods play a crucial role in unraveling the complex transport phenomena associated with coal-bed methane and shale gas. This Review examines the recent advances in simulating gas transport in porous media for predicting gas migration. It discusses the fundamental theories of gas transport in nanoscale pores, encompassing the gas transport mechanisms in porous media and the fundamental equations involved in the simulation methods. Furthermore, a review is provided on the molecular dynamics (MD) and lattice Boltzmann methods. Emphasis is placed on the methods of pore reconstruction, including pore volume, pore size, and pore shape, and their application in diffusion and transport. The advantages and limitations of these two simulation modeling methods are also discussed. The application of various coupled methods in the study of gas transport in porous media is explored, with a key focus on appropriately handling scale translations in flow modeling. This work enhances the understanding of coalbed gas transport and dispersion behavior by summarizing simulation methods for coalbed gas and shale gas transport. Coal reservoirs, compared to shale, exhibit different gas pressures and organic compositions. Hence, the gas transport mechanisms in coal nanopores are still not fully understood. Further research and analysis are needed to investigate how shale gas models can be applied to coalbed gas.

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