Non-linear gas transport inside an ultra-tight Longmaxi shale core under thermal stimulation conditions

Chen, Wei; Yang, Yibo; Wang, Tengxi

doi:10.1016/j.energy.2019.07.176

Cited by 18 publications

(4 citation statements)

References 37 publications

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“…Gas apparent permeability models can be used to define the different flow mechanisms in the nanoporous media. Considering Fongmaxi shale core, Chen et al 18 investigated non-linear gas transport under several thermal conditions. The study utilized numerical models incorporating the temperature effects into the final ultimate recovery.…”

Section: Methodsmentioning

confidence: 99%

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CFD estimation of gas production in tight carbonates using single and dual-porosity models

Khadri,

Hussein,

Sadooni

et al. 2023

Sci Rep

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Tight Carbonate reservoirs are regarded as one of the most complex reservoir formations due to the heterogeneity and complexity of their mineral composition, pore structure, and storage model. It is uncommon to study the implementation of a transport model appropriate for such formation. Recent studies focused on tight reservoirs and developed models for shale or coal bed methane reservoirs. This study proposes a single and dual-porosity transport model that solely considers the tight matrix and acidized region to shed light on the transport models for tight carbonates. The numerical model included the effect of transport mechanisms such as Knudsen diffusion, desorption, and viscous flow. The proposed transport model includes the apparent permeability model defining these transport mechanisms. Finite element method analysis was conducted on the numerical model using COMSOL Multiphysics. Due to the presence of nanopores in both shale and tight Carbonate, transport models proposed for the former can be utilized to determine the fluid flow behavior in the latter. The adsorption isotherm, rock density, pore structure, porosity, and permeability of the tight carbonate reservoir, which contrasted with the shale results, were the defining features of the reservoir used in the transport model. The dual-porosity model yielded a peak production of 104,000 m3/day, whereas the proposed model represents a shallow production rate from the single-porosity reservoir. The results were validated with an analytical solution proposed in the literature. Based on the literature findings and the production profile, the desorption did not play a significant role in the total production due to calcite’s low affinity towards CH4.

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Section: Methodsmentioning

confidence: 99%

“…The study did not include a specific numerical solution unique to cores; instead, it utilized gas flow in the shale reservoir model. Gas extraction is an endothermic process, so studying the temperature impact on the final production is essential 18 . …”

Section: Methodsmentioning

confidence: 99%

CFD estimation of gas production in tight carbonates using single and dual-porosity models

Khadri,

Hussein,

Sadooni

et al. 2023

Sci Rep

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“…In addition, the density of 13 CH 4 molecules is slightly higher than that of 12 CH 4 molecules in the adsorption layers for both 2 and 8 nm nanopores since 13 CH 4 molecules with large physical mass are easier to be trapped on the pore surface . Moreover, it requires more energy for 13 CH 4 to be triggered to leave the surface in the endothermic desorption process. , Additionally, there are two adsorption layers in the vicinity of the OP surface, while only one adsorption layer is formed near the IP wall. In addition, the adsorption layer density in OPs is much higher than that in IPs.…”

Section: Results and Discussionmentioning

confidence: 95%

“…13 Moreover, it requires more energy for 13 CH 4 to be triggered to leave the surface in the endothermic desorption process. 13,54 Additionally, there are two adsorption layers in the vicinity of the OP surface, while only one adsorption layer is formed near the IP wall. In addition, the adsorption layer density in OPs is much higher than that in IPs.…”

Section: Resultsmentioning

confidence: 99%

Carbon Isotope Fractionation during Shale Gas Transport through Organic and Inorganic Nanopores from Molecular Simulations

Wang

Zhao

et al. 2021

Energy Fuels

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Carbon isotope fractionation is a promising method to predict gas-in-place content and evaluate the shale gas production stage. In this study, molecular simulations are conducted to investigate fractionation characteristics of 12CH4 and 13CH4 in high-Kn (Knudsen number) flows (Kn > 0.1) within organic and inorganic pores under shale reservoir conditions (353 K, 5–25 MPa). The results show that isotope fractionation is more obvious (i.e., the difference in transport capacities between 12CH4 and 13CH4 is larger) in organic pores than in inorganic pores. Methane adsorption capacity and surface roughness of pore walls are two major reasons. High-coverage adsorption in organic pores reduces the effective pore size, and the Knudsen diffusion becomes significant. Moreover, the specular reflection of molecules occurs frequently on the smooth surfaces of organic pores, which enlarges the difference in isotope diffusion capacity. Indeed, the difference in energy (specific enthalpy) transport of methane isotopes in organic and inorganic pores is the intrinsic reason for fractionation. Furthermore, the fractionation level is positively correlated with Kn due to the enhanced contribution of Knudsen diffusion and surface diffusion in high-Kn flows. In addition, the isotope fractionation level decreases as pore size increases because Kn and the contribution of the adsorbed phase to the total molar flux reduce in a large pore. Our findings and related analyses may help us to understand isotope fractionation in different pore types and sizes from the atomic level and assist future applications in engineering.

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Physical simulation of the nonlinear transient flow behavior in closed high-pressure gas reservoirs. Part II: pressure-depleted flow experiments on fractured cores

Nie

Fan

et al. 2022

Geomech. Geophys. Geo-energ. Geo-resour.

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Non-linear gas transport inside an ultra-tight Longmaxi shale core under thermal stimulation conditions

Cited by 18 publications

References 37 publications

CFD estimation of gas production in tight carbonates using single and dual-porosity models

CFD estimation of gas production in tight carbonates using single and dual-porosity models

Carbon Isotope Fractionation during Shale Gas Transport through Organic and Inorganic Nanopores from Molecular Simulations

Physical simulation of the nonlinear transient flow behavior in closed high-pressure gas reservoirs. Part II: pressure-depleted flow experiments on fractured cores

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