The Experts below are selected from a list of 25809 Experts worldwide ranked by ideXlab platform
Azaroual Mohamed - One of the best experts on this subject based on the ideXlab platform.
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Well injectivity during CO2 storage operations in deep saline aquifers - Part 2: Numerical simulations of drying, salt deposit mechanisms and role of capillary forces
international journal of Greenhouse Gas Control, 2008Co-Authors: Andre Laurent, Peysson Yannick, Azaroual MohamedAbstract:The injection of CO2 into geological reservoirs or deep saline aquifers is being studied to control global warming by limiting greenhouse gas emissions. CO2 is captured from exhaust gases in power plants or industrial units and stored in underground geological reservoirs. Return on experience with CO2 injection in the oil industry clearly shows that injectivity problems can be encountered due to several mechanisms including mineral dissolution/precipitation and Physical Alteration due to the complete desaturation of the near-wellbore zone. This study describes numerical modelling that is able to reproduce the experimental results of drying of brine-saturated sandstone cores by gas injection in the laboratory. The evolution of water and gas saturation profiles and the precipitation of salt inside the samples are followed with injection time. Numerical results agree well with experimental observations highlighting the key role played by capillary forces during the desiccation process (see the companion paper; Peysson et al., 2013). A tentative extrapolation of experimental results from laboratory scale to the near-well field scale is proposed. This approach is of major importance because it makes it possible to determine the optimal CO2 injection flow rate according to both the intrinsic petroPhysical properties of the porous medium and initial brine salinities.
Brigitte Bazin - One of the best experts on this subject based on the ideXlab platform.
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Impact of porous medium desiccation during anhydrous CO2 injection in deep saline aquifers: up scaling from experimental results at laboratory scale to near-well region
Energy Procedia, 2010Co-Authors: Laurent André, Mohamed Azaroual, Yannick Peysson, Brigitte BazinAbstract:Injection of CO2 in geological reservoirs or deep aquifers is nowadays studied to regulate the global warming by limiting the amount of greenhouse gases emitted by human activity into the atmosphere. CO2 is captured from exhaust gas in power plants or industrial units and then stored in underground geological reservoirs. The experience available in the oil industry concerning CO2 injection clearly shows that injectivity problems can occur due to several mechanisms like mineral dissolution but also Physical Alteration due to complete water desaturation of near wellbore through drying. This study presents experimental evaluations of drying of brine in sandstone samples and numerical modelling of the saturation profile evolution with two phase flow model integrating thermal effects. An up scaling/extrapolation of experimental results at laboratory scale to near-well zone is proposed highlighting the key role of injection flow rate and capillary properties on the desiccation mechanisms.
Andre Laurent - One of the best experts on this subject based on the ideXlab platform.
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Well injectivity during CO2 storage operations in deep saline aquifers - Part 2: Numerical simulations of drying, salt deposit mechanisms and role of capillary forces
international journal of Greenhouse Gas Control, 2008Co-Authors: Andre Laurent, Peysson Yannick, Azaroual MohamedAbstract:The injection of CO2 into geological reservoirs or deep saline aquifers is being studied to control global warming by limiting greenhouse gas emissions. CO2 is captured from exhaust gases in power plants or industrial units and stored in underground geological reservoirs. Return on experience with CO2 injection in the oil industry clearly shows that injectivity problems can be encountered due to several mechanisms including mineral dissolution/precipitation and Physical Alteration due to the complete desaturation of the near-wellbore zone. This study describes numerical modelling that is able to reproduce the experimental results of drying of brine-saturated sandstone cores by gas injection in the laboratory. The evolution of water and gas saturation profiles and the precipitation of salt inside the samples are followed with injection time. Numerical results agree well with experimental observations highlighting the key role played by capillary forces during the desiccation process (see the companion paper; Peysson et al., 2013). A tentative extrapolation of experimental results from laboratory scale to the near-well field scale is proposed. This approach is of major importance because it makes it possible to determine the optimal CO2 injection flow rate according to both the intrinsic petroPhysical properties of the porous medium and initial brine salinities.
Ali Boularbah - One of the best experts on this subject based on the ideXlab platform.
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How Physical Alteration of technic materials affects mobility and phytoavailabilty of metals in urban soils?
Chemosphere, 2016Co-Authors: Hicham El Khalil, Christophe Schwartz, Ouafae El Hamiani, Catherine Sirguey, Jochen Kubiniok, Ali BoularbahAbstract:One fundamental characteristic distinguishing urban soils from natural soils is the presence of technic materials or artefacts underlining the influence of human activity. These technic materials have different nature (organic or inorganic) and origins. They contribute to the enrichment of the soil solution by metallic trace elements. The present study aims to determine the effect of Physical Alteration of the technic coarse fraction on the bioavailability of metallic trace elements in urban Technosols. In general, results show that Physical Alteration increases the metallic trace elements water extractible concentrations of technic materials. The ability of lettuce to accumulate metallic trace elements, even at low concentrations, underlines the capacity of technic materials to contaminate the anthropised soil solution by bioavailable metals. The highest metal levels, accumulated by the various organs of the lettuce (leaves and roots), were measured in plants grown in presence of metallic particles mixtures. This indicates that the majority of metallic trace elements released by this technic constituent is bioavailable and explains the low plant biomass obtained. The abundant part of metallic trace elements released by the other technic constituents (building materials, bones, wood, plastic and fabric-paper) remains less bioavailable. Under anthropised soil conditions, technic materials have a significant effect on the metallic trace elements behavior. They impact the flow of these metallic elements in Technosols, which can increase their bioavailability and, therefore, the contamination of the food chain
Philippe Landrein - One of the best experts on this subject based on the ideXlab platform.
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Environmental and climatic controls of the clay mineralogy of Albian deposits in the Paris and Vocontian basins (France).
Cretaceous Research, 2020Co-Authors: Pauline Corentin, Jean-françois Deconinck, Pierre Pellenard, Francis Amédro, Ludovic Bruneau, Elise Chenot, Bertrand Matrion, Emilia Huret, Philippe LandreinAbstract:High-resolution clay mineral analyses were performed on lower and middle Albian deposits from the Paris and Vocontian basins in order to specify the weathering conditions that prevailed at that time. The clay mineral assemblages are composed of small proportions of chlorite and vermiculitic clays associated with abundant illite, R0 type illite-smectite mixed-layers (smectite) and kaolinite. Clay minerals originated from the Physical Alteration and chemical weathering of rocks and soils outcropping on the Variscan massifs bordering the studied areas. In the Paris Basin, the covariation of illite and kaolinite suggests the reworking of these latter minerals from palaeoAlterations and saprolites coupled with an intense runoff on the London-Brabant Massif under a warm-temperate climate. In comparison with the Paris Basin, the lower Albian series deposited in the Vocontian Basin are enriched in smectite because of the preferential deposition of this mineral in deep offshore environments. In this basin, illite and kaolinite did not show any covariation suggesting that kaolinite is rather the chemical weathering product of rocks exposed in the French Massif Central. The stratigraphic distribution of clay minerals in both studied areas is consistent with a cooler and dryer climate around the Aptian/Albian transition. An enhanced precipitation rate is suggested by an increasing proportion of kaolinite from the Douvilleiceras mammillatum Zone upward. This humid interval ended in the Anahoplites intermedius Zone contemporaneous with the smectite-rich sedimentation in the Paris Basin revealing semi-arid conditions consistent with palynological data. This semi-arid interval encompassing the Dimorphoplites niobe and D. biplicatus zones (and possibly the Dipoloceras cristatum Zone) is interrupted at the base of the Mortoniceras pricei Zone by a return to a more humid climate.