The dependence of shale permeability on confining stress and pore pressure

Bhandari, A. R.; Flemings, P. B.; Hofmann, Ronny

doi:10.1016/j.jngse.2021.104008

Cited by 4 publications

(5 citation statements)

References 33 publications

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“…Another study also gave the same reason. Under a low pore radius and low pore pressure, the slippage effect of shale is significantly enhanced …”

Section: Resultsmentioning

confidence: 99%

“…Under a low pore radius and low pore pressure, the slippage effect of shale is significantly enhanced. 8 The relationship between the apparent permeability of the shale sample and the pore pressure can be fitted with a power function, and a satisfactory fitting effect can be obtained. The fitting equations are expressed below…”

Section: Sample Preparationmentioning

confidence: 96%

“… 4 − 6 The permeability of shale fractures is affected by the effective stress along different paths. 5 , 7 , 8 The internal pressure remains unchanged, and the increase in the external pressure can help effectively reduce the permeability of shale fractures. 5 , 9 , 10 The relationship between the effective stress and shale fracture permeability can be characterized using the exponential model and power model.…”

Section: Introductionmentioning

confidence: 99%

“…The Brazilian splitting method is used to create microfractures in shale, and shale samples containing natural fractures are used to study the change law of the gas permeability in the fractures. − The permeability of shale fractures is affected by the effective stress along different paths. ,, The internal pressure remains unchanged, and the increase in the external pressure can help effectively reduce the permeability of shale fractures. ,, The relationship between the effective stress and shale fracture permeability can be characterized using the exponential model and power model. ,− In addition to the effective stress, the permeability of shale fractures is affected by the external temperature , and gas adsorption characteristics. , The fracture characteristics of the shale itself cannot be ignored. The fracture conductivity is positively correlated with the penetration and opening of fractures. ,,− The permeability of shale fractures is affected by the roughness and tortuosity of the fractures and also by the gas slippage phenomenon. − As a result, the measured permeability is greater than the actual value.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Experimental Study on the Effects of Pore Pressure and Slippage on the Permeability of a Fracture Network during Depressurization of Shale Gas Reservoir Production

Zhao

Sun

et al. 2022

ACS Omega

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Hydraulic fracturing technology is an important technical means to increase shale gas production. The seepage channels formed in the hydraulic fractures during hydraulic fracturing can help increase reservoir permeability. Therefore, it is of significance to study the seepage law of the fracture network after reservoir hydraulic fracturing. In this study, hydraulic fracturing is used to fracture full-diameter shale cores, and three typical forms of hydraulic fracture networks are obtained. The characteristics of the fracture networks are analyzed by X-ray CT scanning. The effects of pore pressure and slippage on the permeability of the fracture networks are simulated by conducting experiments. The experimental results show that in the direction of gas seepage, hydraulic fractures completely penetrate the sample, and the greater the diameter and volume of the fracture, the better the hydraulic fracture conductivity. When the confining pressure remains unchanged at 50 MPa, the apparent permeability values of the hydraulic fractures with the worst and best fracture morphologies increase by 44.4 times and 2.8 times, respectively, with the decrease in the pore pressure from 30 to 2 MPa. The apparent permeability of the shale samples has a power function relationship with the pore pressure. The test results also show that the absolute permeability is positively correlated with the number of effective seepage channels in the hydraulic fractures and the number of hydraulic fractures, whereas the Klinkenberg coefficient is negatively correlated. Our research results can provide a basis for shale gas production model research and for on-site production capacity improvement. The qualitative understanding and scientific explanation of the effects of pore pressure and slippage on fracture network permeability in the process of depressurization of reservoir production have been realized.

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“…Another study also gave the same reason. Under a low pore radius and low pore pressure, the slippage effect of shale is significantly enhanced …”

Section: Resultsmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Study on the Effects of Pore Pressure and Slippage on the Permeability of a Fracture Network during Depressurization of Shale Gas Reservoir Production

Zhao

Sun

et al. 2022

ACS Omega

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show abstract

“…At last, the MD simulation method was used to explore the process of the adsorbed CH 4 displaced by CO 2 and N 2 in shale organic nanopores at the subsurface condition. [39][40][41], CH 4 adsorption in in situ reservoir is particularly complex, which has become the bottleneck of shale gas occurrence mechanism research. To reveal the occurrence and transport characteristics of CH 4 , the influence of temperature and pressure at the subsurface condition will be evaluated in our simulation work.…”

Section: Simulation Detailsmentioning

confidence: 99%

Molecular Simulation of CH4 Nanoscale Behavior and Enhanced Gas Recovery in Organic-Rich Shale

Zhu

et al. 2022

Geofluids

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Occurrence and transport are two important nanoscale behaviors in the exploitation of shale gas. Nanopores in a realistic shale organic matrix are composed of kerogen molecules, which will have a great impact on surface-gas interactions and gas nanoconfined behavior. Although there are previous studies, the physics of gas transport through shale systems remains ambiguous. In this work, cylindrical nanopore models representing different pore sizes and organic-rich shale were constructed. By applying the molecular dynamics simulation method, the occurrence characteristics and transport characteristics of CH4 in the nanopores of organic-rich shale were studied. At last, the process of the adsorbed CH4 displaced by CO2 and N2 in shale nanopores at the subsurface condition was explored. This work can provide a better understanding of gas nanoscale behavior in shale systems and assist the future design of the CO2 sequestration and enhanced gas recovery technique.

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The impact of supercritical CO2 exposure time on the effective stress law for permeability in shale

Tian,

Zhou,

Xian

et al. 2023

Energy

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The dependence of shale permeability on confining stress and pore pressure

Cited by 4 publications

References 33 publications

Experimental Study on the Effects of Pore Pressure and Slippage on the Permeability of a Fracture Network during Depressurization of Shale Gas Reservoir Production

Experimental Study on the Effects of Pore Pressure and Slippage on the Permeability of a Fracture Network during Depressurization of Shale Gas Reservoir Production

Molecular Simulation of CH4 Nanoscale Behavior and Enhanced Gas Recovery in Organic-Rich Shale

The impact of supercritical CO2 exposure time on the effective stress law for permeability in shale

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