Mass Transfer & Porous Media (MTPM) - Andra

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P/MTPM/201.81.61.41.2upstream compartmentdatainitial guessbest estimate1.00.80.60.40.2downstream compartment0.00 200 400 600 800 1'000 1'200 1'400Figure 1: Experimental set-up (Krooss and Alles, 2006) and measured data, initial simulation and best fitfor the upstream and downstream pressure assuming solely diffusive gas transport through the sample(experiment #3)of water through the sample at early times, and – at later times – advective transport of the injected gas(He or Ar) through the sample and diffusion of both the injected gas (He or Ar) and air (initially presentin the downstream compartment) through the sample in opposite directions.The parameter estimation comprised diffusion coefficients of the dissolved gases and the two phase flowparameters according to van Genuchten’s parametric model of capillary pressure and the van Genuchten/Mualem model of relative permeability.ReferencesHildenbrand, A., Schlömer S., B.M. Krooss, 2002: Gas breakthrough experiments on fine-grainedsedimentary rocks, Geofluids (2002)Krooss, B.M., Alles, S., 2006: Investigation of Gas Transport Processes in the Opalinus Clay, unpublishedMont Terri Report.Marschall, P., Horseman, S., Gimmi T.,2005: Characterisation of gas transport properties of the OpalinusClay, a potential host rock formation for radioactive waste disposal. Oil and Gas Science & TechnologyRevue de l’Institut Français du Pétrole, 60 (No. 1&2, 2005).Pruess, K., Oldenburg C., Moridis G., 1999: TOUGH2 User’s Guide, Version 2.0, Lawrence BerkeleyNational Laboratory Report LBNL-43134, Berkeley, CA, November 1999.Page 462INTERNATIONAL MEETING, SEPTEMBER 17...>...18, 2007, LILLE, FRANCECLAYS IN NATURAL & ENGINEERED BARRIERSFOR RADIOACTIVE WASTE CONFINEMENT
P/MTPM/21CALLOVO-OXFORDIAN FORMATIONAT THE MEUSE/HAUTE-MARNE URL:CONSISTENCY BETWEEN MEASUREDHYDRAULIC CONDUCTIVITYAND THE DRAINAGE EFFECTOF THE EXPERIMENTAL DRIFTSJ. Croisé 1 , J. M. Lavanchy 1 , C.P. Enssle 1 , M. Cruchaudet 21. Colenco Power Engineering AG, Groundwater Protection and Waste Disposal, Täfernstr. 26,CH-5404 Baden- Switzerland, ( jean.croise@colenco.ch )2. Andra, Laboratoire de Recherche Souterrain RD960 BP9 55290 Bure,e-mail: martin.cruchaudet@andra.fr , Web page: http://www.andra.frINTRODUCTIONAndra is currently investigating the Callovo-Oxfordian argillaceous formation as a potential host rock forthe deep disposal of high level radioactive waste at the Meuse/Haute-Marne URL (Andra, 2005). A largenumber of geomechanical and hydraulic measurements are performed in instrumented boreholes (Delay etal., 2006a and b). In particular, hydraulic tests were performed in test intervals of these boreholes andallowed the determination of the hydraulic conductivity and of the formation pressure at small scale (max.of a few decimetres due to the low permeability). Furthermore, the porewater pressures perpendicularly tothe drift wall situated at -490 m bgl were measured continuously at distances between a few decimetresup to 20 meters from the drift wall over more than one year. Figure 1 presents a 3D view of theexperimental boreholes and a schematic of measurements of the quasi-stabilized pressures. The aim of thework was to investigate the consistency of the small scale hydraulic conductivity measurements and theobserved pressure distribution around the drifts GEX and SMR1.1 in the rock mass located outside theE xcavation D amaged/ d isturbed Z one (Measurement points situated at distances larger than 5 m from thedrift wall, floor or roof) with the darceen drainage effect due to the atmospheric pressure in theexperimental drifts.RESULTS AND INTERPRETATIONThe pressure data collected between the end of 2005 and the end of 2006 at the 8 measurement pointsborehole intervals of the PEP, DIR and SUG experiments were carefully examined in terms of degree ofreliability and measurements characteristics; a synthesis of quasi-stabilized pressure values was obtained.The drainage effect of the experimental drifts GEX and SMR1.1 has been investigated by means of 2Dverticalflow simulations.Outside the EDZ/EdZ of the drifts (i.e. at most a few meters from the drift wall) the pressuresmeasurements at PEP, DIR and SUG boreholes show that, once the perturbation impact of drilling declines,a quasi-stabilized pressure profile occurs, with a global pressure gradient directed towards the drift(drainage effect).Transient single-phase (water) 2D vertical flow simulations were performed based on a simplified2 homogeneous zones model: a first zone represents the EDZ/EdZ with an enhanced hydraulic conductivitycompared to the intact rock. The second zone is the intact rock, with permeability values fixed at referencesas determined with the hydraulic tests (5· 10 -13 m/s). The drainage effect due to the drift is simulated byspecifying an atmospheric pressure at the drift wall. Suction effects related to the lowered relative humiditydue to ventilation are neglected, as they only impact the first few decimetres around the drift. Thepreliminary conclusions can be drawn from the flow simulation performed:INTERNATIONAL MEETING, SEPTEMBER 17...>...18, 2007, LILLE, FRANCECLAYS IN NATURAL & ENGINEERED BARRIERSFOR RADIOACTIVE WASTE CONFINEMENTPage 463
Page 1: Poster [MTPM]Mass Transfer & Porous
Page 4 and 5: P/MTPM/1The free energy cost of for
Page 7 and 8: P/MTPM/3DIFFUSION OF IONS IN UNSATU
Page 9: P/MTPM/4POROUS MEDIA CHARACTERIZATI
Page 12 and 13: P/MTPM/5Oxalate ionsQuartzQuartz +P
Page 14 and 15: P/MTPM/6borehole was capped with a
Page 16 and 17: P/MTPM/7Initial state with glass an
Page 18 and 19: P/MTPM/8The mesh of the elementary
Page 20 and 21: P/MTPM/9Moreover, using another sam
Page 22 and 23: P/MTPM/10Figure 1: Horizontal cross
Page 24 and 25: P/MTPM/11n t (mol)as received8 10 -
Page 26 and 27: P/MTPM/1210,9Degree of saturation (
Page 28 and 29: P/MTPM/13RESULTSFirst, we estimated
Page 30 and 31: P/MTPM/142.5Energy (M eV)1.6 1.7 1.
Page 32 and 33: P/MTPM/15C/Co10.90.80.70.60.50.40.3
Page 34 and 35: P/MTPM/16ModelIrmayvG-M1vG-M2vG-M3T
Page 36 and 37: P/MTPM/17Figure 1: Experimental HTO
Page 38 and 39: P/MTPM/18Diffusion experiments were
Page 40 and 41: P/MTPM/19Figure 1: Used mesh for co
Page 44 and 45: P/MTPM/21490Pressure [bar]0 10 20 3
Page 46 and 47: 134P/MTPM/22through-diffusion exper
Page 48 and 49: P/MTPM/23HA (µg/g)3002001000(a):pH
Page 50 and 51: P/MTPM/24through each sample. The p
Page 52 and 53: P/MTPM/25FIRST RESULTSPreliminary c
Page 54 and 55: P/MTPM/26heterogeneous distribution
Page 56 and 57: P/MTPM/27Relative concentration (C-
Page 58 and 59: P/MTPM/280.75m0.25mTable 1: Cross s
Page 60 and 61: P/MTPM/29Figure 1: A. Scheme of the
Page 62 and 63: P/MTPM/30The presented theory is ex
Page 64 and 65: P/MTPM/31Furthermore, Van Loon et a
Page 66 and 67: P/MTPM/32RESULTSResults show that,
Page 68 and 69: P/MTPM/33Clay modellingPore size di
Page 70 and 71: P/MTPM/341.60E-11f H2-d total (kg.m
Page 72 and 73: P/MTPM/350.50η R ()0.400.300.200.1
Page 74 and 75: P/MTPM/36200Bq/g1801601401201008060
Page 76 and 77: P/MTPM/37Argilite (ionic strength 0
Page 78 and 79: P/MTPM/38-Samples cored at 12m were
Page 80 and 81: P/MTPM/39APPLICATIONSCORE 2D has be
Page 82 and 83: P/MTPM/40Figure 1: Sketch drawing o
Page 84 and 85: P/MTPM/41Figure 1: Thermal conducti
Page 86 and 87: P/MTPM/42Figure 2: Model of pore st
Page 88 and 89: P/MTPM/43The available data are con
Page 90 and 91: P/MTPM/44Figure 1: Spatial extensio
Page 92 and 93:
P/MTPM/45Relative concentration / (
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P/MTPM/46Figure 2: Swelling pressur
Page 96 and 97:
P/MTPM/47then used in the transport
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P/MTPM/4820181614121086Gas pressure
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Mass Transfer & Porous Media (MTPM) - Andra

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