Experimental investigation of the influence of differential stress on permeability of a lower permian (rotliegend) sandstone deformed in the brittle deformation field

Heiland, J.; Raab, Siegfried

doi:10.1016/s1464-1895(01)00019-9

Cited by 66 publications

(34 citation statements)

References 3 publications

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“…min -1 and 0.1 MPa . min -1 , low enough to be close to quasi-static conditions (HEILAND and RAAB, 2000). Deviatoric loadings are performed at a low confining pressure of 3 MPa, which insures the sealing of the sleeve, while a ''uniaxial'' stress state is imposed.…”

Section: Experimental Set-up and Proceduresmentioning

confidence: 99%

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Axial and Radial Permeability Evolutions of Compressed Sandstones: End Effects and Shear-band Induced Permeability Anisotropy

Dautriat

Gland

Guélard

et al. 2009

Pure appl. geophys.

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The influence of hydrostatic and uniaxial stress states on the porosity and permeability of sandstones has been investigated. The experimental procedure uses a special triaxial cell which allows permeability measurements in the axial and radial directions. The core sleeve is equipped with two pressure samplers placed distant from the ends. They provide mid-length axial permeability measure as opposed to the overall permeability measure, which is based on the flow imposed through the pistons of the triaxial cell. The core sleeve is also equipped to perform flows in two directions transverse to the axis of the sample. Two independent measures of axial and complementary radial permeability are thus obtained. Both Fontainebleau sandstone specimens with a porosity of about 5.8% to 8% and low permeability ranging from 2.5 mD to 30 mD and Bentheimer sandstone with a porosity of 24% and a high permeability of 3D have been tested. The initial axial permeability values obtained by each method are in good agreement for the Fontainebleau sandstone. The Bentheimer sandstone samples present an axial mid-length permeability 1.6 times higher than the overall permeability. A similar discrepancy is also observed in the radial direction, also it relates essentially to the shape of flow lines induced by the radial flow. All the tested samples have shown a higher stress dependency of overall and radial permeability than mid-length permeability. The effect of compaction damage at the pistons/sample and radial ports/sample interfaces is discussed. The relevance of directional permeability measurements during continuous uniaxial compression loadings has been shown on the Bentheimer sandstone until the failure of the sample. We can efficiently measure the influence of brittle failure associated to dilatant regime on the permeability: It tends to increase in the failure propagation direction and to decrease strongly in the transverse direction.

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Section: Experimental Set-up and Proceduresmentioning

confidence: 99%

“…For instance, a similar procedure of continuous permeability measurements during triaxial loading is discussed by HEILAND and RAAB (2000). We have measured each continuous directional permeability during two cycles of loading/unloading, taking into account the axial and radial strains of the sample.…”

Section: High Permeability Bentheimer Sandstonementioning

confidence: 99%

Axial and Radial Permeability Evolutions of Compressed Sandstones: End Effects and Shear-band Induced Permeability Anisotropy

Dautriat

Gland

Guélard

et al. 2009

Pure appl. geophys.

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“…Brace et al (1968) measured the permeability of Westerly granite as a function of effective pressure using a transient method. Heiland and Raab (2001) further investigated the influence of differential stress on the permeability of sandstone under triaxial compression. According to Jiang et al (2010), permeability change is closely related to the density and opening of microcracks within the material.…”

Section: Introductionmentioning

confidence: 99%

Permeability Evolution of Granite Gneiss During Triaxial Creep Tests

Liu

Wang

et al. 2016

Rock Mech Rock Eng

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Permeability is an important factor for seepage analysis of rock material, and a key factor in ensuring the safety of underground works. In this study, the permeability evolution of granite gneiss during triaxial creep tests was investigated. In the context of an underground oil storage cavern in China, a series of hydro-mechanical coupling creep tests were conducted on rock cores of granite gneiss at three different pore pressures to reveal the effect of pore pressure on the permeability evolution and to investigate the correlation between the permeability and volumetric strain during the creep process. During the creep tests, the permeability decreases in the initial loading phase. At all deviatoric stress levels, the permeability remains stable in the steady creep stage and increases rapidly in the accelerated creep stage. Based on the test data, the initial permeability, steady permeability and peak permeability at various stress levels are defined. The effect of pore pressure on the permeability is captured by a linear model. In addition, the relationship between permeability and volumetric strain can be described as a process divided into three phases, with different functions in each phase.

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“…These deformations of the porous structures modify the transport properties, and thus the production efficiency [1]. Several extensive experimental studies have investigated the dependency of rock permeability on effective pressure, during the brittle regime and cataclastic flow of sandstones [2,3,4,5,6]. In carbonates, the microstructural control of failure mechanisms is more complex than in sandstones and remains an extended matter of research [7].…”

Section: Introductionmentioning

confidence: 99%

Stress path dependent hydromechanical behaviour of heterogeneous carbonate rock

Gland

Dautriat

Dimanov

et al. 2010

EPJ Web of Conferences

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Abstract. The influence of stress paths, representative of reservoir conditions, on the hydromechanical behavior of a moderately heterogeneous carbonate has been investigated. Multiscale structural heterogeneities, common for instance in carbonate rocks, can strongly alter the mechanical response and significantly influence the evolution of flow properties with stress. Using a triaxial cell, the permeability evolutions during compression and the effects of brittle (fracture) and plastic (pore collapse) deformations at yield, were measured. A strong scattering was observed on the mechanical response both in term of compressibility and failure threshold. Using the porosity scaling predicted by an adapted effective medium theory (based on crack growth under Hertzian contact), we have rescaled the critical pressures by the normalized porosity deviation. This procedure reduces efficiently the scattering, revealing in the framework of proportional stress path loading, a linear relation between the critical pressures and the stress path parameter through all the deformation regimes. It leads to a new formulation for the critical state envelope in the 'mean stress, deviatoric stress' diagram. The attractive feature of this new yield envelope formulation relies on the fact that only the two most common different mechanical tests 'Uniaxial Compression' and 'Hydrostatic Compression', are needed to define entirely the yield envelope. Volumic strains and normalized permeabilities are finally mapped in the stresses diagram and correlated.

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Experimental investigation of the influence of differential stress on permeability of a lower permian (rotliegend) sandstone deformed in the brittle deformation field

Cited by 66 publications

References 3 publications

Axial and Radial Permeability Evolutions of Compressed Sandstones: End Effects and Shear-band Induced Permeability Anisotropy

Axial and Radial Permeability Evolutions of Compressed Sandstones: End Effects and Shear-band Induced Permeability Anisotropy

Permeability Evolution of Granite Gneiss During Triaxial Creep Tests

Stress path dependent hydromechanical behaviour of heterogeneous carbonate rock

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