Characterization of the hydromechanical behavior of argillaceous rocks with effective gas permeability under deviatoric stress

Yang, Diansen; Billiotte, Joël; Su, Kun

doi:10.1016/j.enggeo.2010.04.002

Cited by 35 publications

(24 citation statements)

References 15 publications

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“…The dependence of gas permeability on water content has been observed in the past on Cox shale25. The experimental results of Yang et al 25. show that there exists a quasi-linear relationship between log( K a ) and the saturation.…”

Section: Discussionmentioning

confidence: 93%

Experimental investigation on the coupled effect of effective stress and gas slippage on the permeability of shale

Yang

Wang

Chen

et al. 2017

Sci Rep

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Permeability is one of the most important parameters to evaluate gas production in shale reservoirs. Because shale permeability is extremely low, gas is often used in the laboratory to measure permeability. However, the measured apparent gas permeability is higher than the intrinsic permeability due to the gas slippage effect, which could be even more dominant for materials with nanopores. Increasing gas pressure during tests reduces gas slippage effect, but it also decreases the effective stress which in turn influences the permeability. The coupled effect of gas slippage and effective stress on shale permeability remains unclear. Here we perform laboratory experiments on Longmaxi shale specimens to explore the coupled effect. We use the pressure transient method to measure permeability under different stress and pressure conditions. Our results reveal that the apparent measured permeability is controlled by these two competing effects. With increasing gas pressure, there exists a pressure threshold at which the dominant effect on permeability switches from gas slippage to effective stress. Based on the Klinkenberg model, we propose a new conceptual model that incorporates both competing effects. Combining microstructure analysis, we further discuss the roles of stress, gas pressure and water contents on gas permeability of shale.

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Section: Discussionmentioning

confidence: 93%

Experimental investigation on the coupled effect of effective stress and gas slippage on the permeability of shale

Yang

Wang

Chen

et al. 2017

Sci Rep

Self Cite

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“…The steady state method is acceptable and very precise for measuring permeability bigger than 10 −19 m 2 (Yang, Billiotte, & Su, 2010). Thus, this method has been employed to determine the permeability of cataclastic sandstone.…”

Section: Methodsmentioning

confidence: 99%

Creep behaviour and permeability evolution of cataclastic sandstone in triaxial rheological tests

Zhang

Shao

et al. 2014

European Journal of Environmental and Civil Engineering

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This article reports the results of triaxial creep tests of cataclastic sandstone cored from the dam foundation of a hydropower station. Meanwhile, the permeability measurements are performed in course of creep tests under hydro-mechanical coupling. The creep behaviours of studied rock and their effects on the permeability evolution have been analysed in detail. The results show that the studied rock exhibits pronounced irreversible time-dependent deformations. The strain rate increases by exponential functions as the deviatoric stress increased and the confining pressure decreased. The long-term strength can be defined at which the critical point of expansion strain rate is greater than the compression strain rate. In addition, important plastic deformation, obvious dilation and large strain rate are observed in the last stage of experimental tests. The permeability change shows some mutative correlation with the material porosity during the time-dependent deformation. But the trend of change is decreasing with the increase of deviatoric stress for all specimens. During the stage of steady creep, the permeability variation slowly decreases quasilinearly. It indicates that the fluctuation has no significant effect on permeability evolution. These results may provide the basis for the establishment of hydro-mechanical coupling creep model and the long-term stability analysis of structures.

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“…Factors that affect the permeability features, such as stress (Baghbanan and Jing, 2008;Talbot and Sirat, 2001;Yang et al, 2010;Zhang et al, 2007;Zhou et al, 2008), and temperature (Moore et al, 1994;Summers et al, 1978) can also be studied by the methods of field surveys, laboratory experiments and numerical simulations. However, they are beyond the scope of this study.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the permeability anisotropy of 2D fractured rock masses

Ren

et al. 2015

Engineering Geology

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Characterization of the hydromechanical behavior of argillaceous rocks with effective gas permeability under deviatoric stress

Cited by 35 publications

References 15 publications

Experimental investigation on the coupled effect of effective stress and gas slippage on the permeability of shale

Experimental investigation on the coupled effect of effective stress and gas slippage on the permeability of shale

Creep behaviour and permeability evolution of cataclastic sandstone in triaxial rheological tests

Investigation of the permeability anisotropy of 2D fractured rock masses

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