Under stress permeability determination of the Meuse/Haute-Marne mudstone

Escoffier, Sandra; Homand, Françoise; Giraud, Albert; Hoteit, N.; Su, Kun

doi:10.1016/j.enggeo.2005.06.020

Cited by 54 publications

(28 citation statements)

References 7 publications

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“…Several studies (ANDRA 2005(ANDRA , 2012Escoffier et al 2005;Pham 2006; Davy et al 2007;Distinguin & Lavanchy 2007;Boulin et al 2008;Zhang et al 2010;Skoczylas 2011;Cariou et al 2012;M'Jahad 2012) have been conducted by ANDRA and the scientific community to investigate the behaviour of COx argillite under varied thermal, hydric, mechanical and chemical conditions, corresponding to deep underground storage conditions, in terms of water retention properties (Pham 2006;Distinguin & Lavanchy 2007;Cariou et al 2012) and gas transport ability (Escoffier et al 2005;Davy et al 2007;Boulin et al 2008), as well as the possible coupling between water retention and gas permeability (Zhang et al 2010). However, very few studies have simultaneously investigated the pore-size distribution, water retention, and relative gas permeability and gas migration properties of damaged COx argillite that are afforded in this study.…”

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confidence: 99%

Characterization of transport and water retention properties of damaged Callovo-Oxfordian claystone

M’Jahad

Davy

Skoczylas

et al. 2016

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International audienceIn the context of the underground storage of radioactive waste, the aim of this experimental study is to characterize the effect of damage on transport and water retention properties of Callovo-Oxfordian (COx) argillite. The originality of the study is to simultaneously investigate the pore-size distribution, water retention, the dry, effective and relative gas permeability, and the gas breakthrough pressure (GBP) of damaged COx argillite. These different properties are all relevant to characterizing the fluid transport ability of COx argillite.Results show that the damage has a significant impact on the properties of the COx argillite. It induces a decrease in its water retention capacity and GBP, and it increases its gas permeability and apparent porosity available to water owing to the creation of micro-cracks.Another objective is to show which of these properties is the most suitable to detect early damage states in COx argillite, with a potential use being to identify them in situ. GBP appears to be the best ‘detector’ of damage because of its sensitivity to damage even under high confinement pressures. Gas permeability could be a good indicator of damage, as it increases significantly (one or several orders of magnitude) after the damage. Finally, the water permeability curve is a poor indicator of COx argillite damage

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confidence: 99%

Characterization of transport and water retention properties of damaged Callovo-Oxfordian claystone

M’Jahad

Davy

Skoczylas

et al. 2016

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“…Downstream pressure evolution with time was compared to simulations based on the following system of equations according to the water mass balance (3) and the two pressure boundary conditions (4) and (5) (Escoffier et al, 2005):…”

Section: The Pore Pressure Transmission Testmentioning

confidence: 99%

“…Most of the authors dealing with very low permeability measurements use a transient method known as pulse decay (Escoffier et al, 2005). Its principle, illustrated in Figure 1, was first proposed by Brace et al (1968).…”

Section: Introductionmentioning

confidence: 99%

“…Equations are available in Hsieh et al (1981) and their practical application can be found in Neuzil et al (1981). The Heish's expressions are also used, for example, in Escoffier et al (2005). A sensitivity analysis is available in Zhang et al (2000).…”

Section: Introductionmentioning

confidence: 99%

“…However, those approaches can require additional parameters related to the sample geomechanical deformations. Pulse decay experiment durations last from 2 hours for a 90 nD sample (Roy et al, 1993) to 5 hours for a 14 nD sample (Escoffier et al, 2005). It is thus a fast method for permeability measurements.…”

Section: Introductionmentioning

confidence: 99%

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Contribution of the Steady State Method to Water Permeability Measurement in Very Low Permeability Porous Media

Boulin

Bretonnier

Gland

et al. 2012

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Résumé -Contribution de la méthode stationnaire dans les mesures des très faibles perméa-bilités à l'eau -Les milieux très peu perméables (k < 10 nD (10 −20 m 2 )) comme les argiles sont étudiés dans le cadre de problématiques très diverses telles que le stockage du CO 2 , les surpressions en forage profond ou le stockage des déchets radioactifs. La caractérisation pétrophysique de ces roches, et notamment la mesure de leur faible perméabilité, est difficile. La technique en laboratoire la plus répandue est celle du pulse decay. Cette technique consiste à imposer un pulse de pression en amont de l'échantillon puis de suivre l'évolution des pressions amont et aval. La durée de l'essai est supérieure à la journée pour des échantillons d'un nanoDarcy. Le signal est fortement tributaire des fuites dans le système ou des variations de température. La méthode stationnaire consiste à mesurer directement le débit d'eau à travers l'échantillon pour un gradient de pression donné. Cette technique est rarement utilisée pour les milieux très peu perméables car réputée très longue (Hsieh et al., 1981, Int. J. Rock Mech. Min. Sci. Geomech. Abstr. 18, 245-252). Des essais en laboratoire ont été réalisés sur trois échantillons. La méthode stationnaire ainsi que des méthodes transitoires (dont le pulse decay) furent employées. La limitation principale des méthodes transitoires est la difficulté d'interpréter correctement les profils de relaxation. La méthode stationnaire s'est montrée aussi rapide (trois jours pour un échantillon de 0.8 nD (8 × 10 −22 m 2 )), voire plus rapide (moins d'une journée pour un échantillon de 2.6 nD (2.6 × 10 −21 m 2 )), que la méthode du pulse decay. La perméabilité a été plus simple à déterminer et cette méthode peut être rapide avec un équipement adapté. En réalité, la faible compressibilité de la roche permet une propagation rapide des ondes de pression. De ce fait, il ne peut pas être soutenu que les conditions de régime permanent ne soient pas atteintes en un temps raisonnable. La méthode pulse decay reste une alternative intéressante à la méthode stationnaire lorsque la perméabilité est supérieure à 50 nD (5 × 10 −20 m 2 ). Abstract

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Hydrologic issues associated with nuclear waste repositories

2015

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Significant progress in hydrology, especially in subsurface flow and solute transport, has been made over the last 35 years because of sustained interest in underground nuclear waste repositories. The present paper provides an overview of the key hydrologic issues involved, and to highlight advances in their understanding and treatment because of these efforts. The focus is not on the development of radioactive waste repositories and their safety assessment, but instead on the advances in hydrologic science that have emerged from such studies. Work and results associated with three rock types, which are being considered to host the repositories, are reviewed, with a different emphasis for each rock type. The first rock type is fractured crystalline rock, for which the discussion will be mainly on flow and transport in saturated fractured rock. The second rock type is unsaturated tuff, for which the emphasis will be on flow from the shallow subsurface through the unsaturated zone to the repository. The third rock type is clay-rich formations, whose permeability is very low in an undisturbed state. In this case, the emphasis will be on hydrologic issues that arise from mechanical and thermal disturbances; i.e., on the relevant coupled thermo-hydromechanical processes. The extensive research results, especially those from multiyear large-scale underground research laboratory investigations, represent a rich body of information and data that can form the basis for further development in the related areas of hydrologic research. General IntroductionSignificant progress in hydrology, especially in subsurface flow and solute transport, has been made over the last 35 years because of sustained interest in the performance assessment of proposed underground nuclear waste repositories. The present paper attempts to provide an overview of the key hydrologic issues involved and to highlight the advances in their understanding and treatment because of these efforts. This paper is not focused on the development of high-level nuclear waste repositories and their safety assessment; it focuses instead on the advances in hydrologic science which have emerged from such studies. These advances may find applications in other hydrology-related problems of current importance at the national and international levels, such as environmental contamination remediation, carbon dioxide geosequestration, and natural gas production through fracking.In the next section, we present, in a general way, the context for the hydrologic framework related to performance and safety assessment of underground nuclear waste repositories that are proposed to be constructed in three particular rock formations-crystalline rock, unsaturated tuffs, and clays. Then, we discuss some particularly challenging factors concerning the research common to these three formations. This discussion will be followed by three sections devoted to each of these three rock types, respectively, to present a review of hydrologic research in these areas.

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Under stress permeability determination of the Meuse/Haute-Marne mudstone

Cited by 54 publications

References 7 publications

Characterization of transport and water retention properties of damaged Callovo-Oxfordian claystone

Characterization of transport and water retention properties of damaged Callovo-Oxfordian claystone

Contribution of the Steady State Method to Water Permeability Measurement in Very Low Permeability Porous Media

Hydrologic issues associated with nuclear waste repositories

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