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Letteratura scientifica selezionata sul tema "Gas migration in porous media"

Autore: Grafiati

Pubblicato: 19 aprile 2025

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Articoli di riviste sul tema "Gas migration in porous media"

Mahabadi, Nariman, Xianglei Zheng, Tae Sup Yun, Leon van Paassen e Jaewon Jang. "Gas Bubble Migration and Trapping in Porous Media: Pore-Scale Simulation". Journal of Geophysical Research: Solid Earth 123, n. 2 (febbraio 2018): 1060–71. http://dx.doi.org/10.1002/2017jb015331.

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Van De Ven, C. J. C., e Kevin G. Mumford. "Visualization of gas dissolution following upward gas migration in porous media: Technique and implications for stray gas". Advances in Water Resources 115 (maggio 2018): 33–43. http://dx.doi.org/10.1016/j.advwatres.2018.02.015.

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Wang, Yang, Ping Liu, Yangwen Zhu, Guanli Xu, Zijing Cui e Ruotong Du. "Effect of Janus nanoparticles on foam snap off in porous media". Tenside Surfactants Detergents 61, n. 3 (1 maggio 2024): 240–49. http://dx.doi.org/10.1515/tsd-2023-2573.

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Abstract Nanoparticles can be adsorbed at the gas-liquid interface to improve the stability of foam. However, homogeneous nanoparticles exhibit low surface activity, and their migration to the gas-liquid interface requires significant energy input. This leads to harsh foaming conditions and severely limits the application of homogeneous nanoparticles in foam stability. A microfluidic visualisation model for the study of Janus nanoparticle complex systems was used to investigate the formation behaviour of trapped bubbles in a single connected pore-throat model. The foam generated in the pore showed reduced quantities, sizes, improved quality, and enhanced stability compared to both surfactant systems and hydrophilic nanoparticle complex systems.

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Jung, Jongwon, Hongsig Kang, Shuang Cindy Cao, Riyadh I. Al-Raoush, Khalid Alshibli e Joo Yong Lee. "Effects of Fine-Grained Particles’ Migration and Clogging in Porous Media on Gas Production from Hydrate-Bearing Sediments". Geofluids 2019 (23 maggio 2019): 1–11. http://dx.doi.org/10.1155/2019/5061216.

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The migration of fine particles in porous media has been studied for different applications, including gas production from hydrate-bearing sediments. The clogging behavior of fine particles is affected by fine particle-pore throat size ratio, fine particle concentration, ionic concentration of fluids, and single/multiphase fluid flow. While previous studies presented valuable results, the data are not enough to cover a broad range of particle types and sizes and pore throat size in natural hydrate-bearing sediments. This paper presents a novel micromodel to investigate the effects of fine particle-pore throat size ratio, fine concentration, ionic concentration of fluid, and single/multiphase fluid flow on clogging or bridging in porous media. The results show that (1) the concentration of fine particles required to form clogging and/or bridging in pores decreased with the decrease in fine particle-pore throat size ratio, (2) the effects of ionic concentration of fluid on clogging behaviors depend on the types of fine particles, and (3) fine particles prefer to accumulate along the deionized water- (DW-) CO2 interface and migrate together, which in turn easily causes clogging in pores. As a result, multiphase fluid flow during gas production from hydrate-bearing sediments could easily develop clogging in pore throats, where the relative permeability of DW-CO2 in porous media decreases. Accordingly, the relatively permeability of porous media should be evaluated by considering the clogging behavior of fines.

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Peng, Zhigao, Shenggui Liu, Songlei Tang, Yuechao Zhao e Yingjun Li. "Multicomponent Lattice Boltzmann Simulations of Gas Transport in a Coal Reservoir with Dynamic Adsorption". Geofluids 2018 (12 luglio 2018): 1–13. http://dx.doi.org/10.1155/2018/5169010.

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Gas adsorption occurs when the dynamic adsorption equilibrium conditions of the local adsorptive sites are broken. In the overall process of unconventional natural gas generation, enrichment, storage, and production, this phenomenon plays a significant role. A double-distribution Lattice Boltzmann model for solving the coupled generalized Navier-Stokes equation and advection-diffusion equation with respect to the gas-solid dynamic adsorption process is proposed for multicomponent gas migration in the unconventional reservoir. The effective diffusion coefficient is introduced to the model of gas transport in the porous media. The Langmuir adsorption rate equation is employed to control the adsorption kinetic process of gas-solid adsorption/desorption. The model is validated in two steps through fluid flow without and with gas diffusion-adsorption between two parallel plates filled with porous media, respectively. Simulation results indicate that with other parameters being equal, the rate of gas diffusion in the porous material and the area of the dynamic adsorption equilibrium-associated region increase with the matrix porosity/permeability. Similar results will happen with a greater saturation adsorption amount or a lower Langmuir pressure. The geometric effect on adsorption is also studied, and it is found that a higher specific surface area or free flow region can enhance the gas transport and the rate of adsorption.

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MEAKIN, PAUL, GERI WAGNER, VIDAR FRETTE, JENS FEDER e TORSTEIN JØSSANG. "FRACTALS AND SECONDARY MIGRATION". Fractals 03, n. 04 (dicembre 1995): 799–806. http://dx.doi.org/10.1142/s0218348x95000709.

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The process of secondary migration, in which oil and gas are transported from the source rocks, through water saturated sedimentary carrier rocks, to a trap or reservoir can be described in terms of the gravity driven penetration of a low-density non-wetting fluid through a porous medium saturated with a wetting fluid. This process has been modeled in the laboratory and by computer simulations using homogeneous porous media. Under these conditions, the pattern formed by the migrating fluid can be described in terms of a string of fractal blobs. The low density internal structure of the fractal blobs and the concentration of the transport process onto the self-affine strings of blobs (migration channels) both contribute to the small effective hydrocarbon saturation in the carrier rocks. This allows the hydrocarbon fluids to penetrate the enormous volume of carrier rock without all of the hydrocarbon being trapped in immobile isolated bubbles. In practice, heterogeneities in the carrier rocks play an important role. In some cases, these heterogeneities can be represented by fractal models and these fractal heterogeneity models provide a basis for more realistic simulations of secondary migration. Fractures may play a particularly important role and migration along open fractures was simulated using a self-affine fractal model for the fluctuating fracture aperture.

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Ezeuko, C. C., e S. R. McDougall. "Modeling Flow Transitions during Buoyancy-Driven Gas Migration in Liquid-Saturated Porous Media". Vadose Zone Journal 9, n. 3 (agosto 2010): 597–609. http://dx.doi.org/10.2136/vzj2009.0037.

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Masum, S. A., P. J. Vardon, H. R. Thomas, Q. Chen e D. Nicholson. "Multicomponent gas flow through compacted clay buffer in a higher activity radioactive waste geological disposal facility". Mineralogical Magazine 76, n. 8 (dicembre 2012): 3337–44. http://dx.doi.org/10.1180/minmag.2012.076.8.46.

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AbstractAt the post-closure stage of a geological disposal facility for higher activity radioactive waste several species of gas are likely to be generated in the near-field environment. These could alter the sealing and chemical properties of the bentonite buffer and the local geochemical environment significantly. The authors' attempt to simulate multicomponent gas flow through variably saturated porous media is presented. Governing equations have been developed for a reactive gas-flow model to simulate the thermo-hydro-gas-chemical-mechanical behaviour, with specific reference to the performance of highly compacted bentonite buffer subjected to repository gas generation and migration. The developed equations have been included in the bespoke numerical model COMPASS and some generic simulations are also presented. The model presented extends current capability to assess buffer performance.

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Munholland, Jonah L., Kevin G. Mumford e Bernard H. Kueper. "Factors affecting gas migration and contaminant redistribution in heterogeneous porous media subject to electrical resistance heating". Journal of Contaminant Hydrology 184 (gennaio 2016): 14–24. http://dx.doi.org/10.1016/j.jconhyd.2015.10.011.

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An, Huaming, Ruyue Gong, Xingxing Liang e Hongsheng Wang. "Numerical Simulation Study on Gas Migration Patterns in Ultra-Long Fully Mechanized Caving Face and Goaf of High Gas and Extra-Thick Coal Seams". Fire 8, n. 1 (31 dicembre 2024): 13. https://doi.org/10.3390/fire8010013.

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The purpose of this study is to understand the law of gas migration in the goaf and reduce the gas on the working face. Taking the N2105 working face of the coal mining industry as the research object, the mathematical model of gas seepage in the goaf was established based on the percolation theory of porous media, and the model was solved. Using Fluent software to simulate the initial pressure, the working face airflow, and gas concentration distribution, different ventilation modes of gas concentration distribution and migration law with different wind speeds after the initial gas pressure. It is concluded that for the first time, the effect of gas on the working face is insignificant, and the influence of the initial pressure on the working surface is gradually revealed. The influence of airflow speed on the goaf is mainly concentrated in the 20~30 m area near the working face, which is affected by the airflow speed of the working face. The gas concentration in the goaf is low, and the fluctuation is obvious. The types of ventilation directly affect the seepage law of goaf gas. The U + I and U + L type ventilation can reduce the gas concentration in the upper corner and f gas seepages from goaf to the working face.

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Tesi sul tema "Gas migration in porous media"

Awan, Faisal Ur Rahman. "Electrokinetic investigation of coal fines in fractured and porous media". Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2022. https://ro.ecu.edu.au/theses/2523.

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Coal seams are unconventional subsurface formations that host methane and are weaker (relative to conventional subsurface) formations. Coal seams are prone to coal fines generation within the fractured porous space throughout the life of the reservoir. These coal fines damage the permeability, deliverability and productivity of coal seams. Furthermore, the coal fines mobility/blockage in the hydraulically induced fractures and proppant packs negatively impacts the proppant conductivity. In this work, a comprehensive study has been conducted to augment the understanding of coal fines and their behaviour within porous and proppant pack systems. Systematic experiments were conducted to address the coal fines by developing various approaches presented in this work. The approaches adopted to achieve the study objectives were: i) streaming zeta potential on coal and sandstone, ii) nano-treated proppant surface modification for coal fines adsorption, and iii) coal fines mobility/attachment in the proppant packs. One of the electrokinetic parameters that is crucial in releasing/mobilising coal fines is coal’s zeta potential. The coal surface is generally hydrophobic and possesses negative zeta potential. Researchers have used the electrophoretic zeta potential technique to indicate charge identification of coal particles, denoting repulsion or attraction of the particle. In chapter 3, a robust study investigates streaming zeta potential measurements of an in-situ sub-bituminous coal core saturated with saline water of 0.1, 0.3 and 0.6 mol.dm-3 NaCl salinities. Thus, the novel study determines the charge carried by percolating fluid when passing through coal rock. The zeta potential is directly proportional to saline water salinity. The trends found in the research were consistent with reported zeta potential measured using other techniques, while the magnitude varied. The findings reported in the study apply to subsurface coal seams at salinity up to 0.6 mol.dm-3 NaCl. Coal seams are hydraulically fractured for commercial production, and sand-based proppants occupy the fractured space. Before understanding the electrokinetics of coal fines, the behaviour of these sand-based proppants should be determined. Sand-based proppants are predominantly silica, and so are sandstones. Furthermore, the selection of sandstone was further motivated by two reasons, i) for comparison and benchmarking, and ii) correlation with coals (as sandstone and coal both are negatively charged). The research presented in chapter 4 considered clay-rich (i.e. clay ≥ 5 wt.%) sandstones for the first time (as coal can have clay ingredients). Specifically, streaming potential measurements were conducted on Bandera Grey sandstone (clay-rich and -poor) saturated with saline water in pressurised environments. Additionally, the streaming potential was determined at identical conditions for the effect of two surfactants, sodium dodecylbenzene sulfonate (SDBS) and cetrimonium bromide (CTAB), at concentrations of 0.01 and 0.1 wt. % on the clay-poor sample. Moreover, a comparison of electrophoretic and streaming zeta potentials was conducted. Accordingly, the work analyses the effects of mineralogy and surfactants within this process. Clay-rich sandstone possessed lower zeta-potentials than clay-poor sandstone at the two tested salinities. SDBS reduced zeta-potential and yielded higher repulsive forces rendering the rock more hydrophilic. Additionally, electrophoretic zeta-potentials were higher when compared to streaming zeta-potentials. Mechanisms for the observed phenomena are also provided. Following the observations from the two studies, proppant column experiments with glass bead proppant and high volatile bituminous were conducted and are presented in chapter 5. One of the approaches to handling coal fines is its dispersal within the aqueous suspension. Proppant column experiments were conducted to test various schemes. It was found that coal zeta potential using SDBS reaches a maximum, and regardless of the pH, it effectively delivers the maximum output of coal fines in the effluent. Thus, a 0.001 wt.% SDBS could effectively disperse coal fines suspension through proppant packs. Nano-treated proppant surface modification was developed to investigate coal fines mobility/attachment within the proppant packs. Succinctly, four (alumina, magnesia, silica and zirconia) nanoparticles (NPs) were adsorbed onto synthetic porous media (glass bead) using a robust pseudo-continuous fixed-bed (PCFB) adsorption method in work presented in chapter 6. A wide range of salinity (0 to 10.5 wt.% NaCl), temperature (298.15 to 348.15 K), NPs loading (0.01 to 0.2 wt.%), and injection rate (1 to 50 mL.min-1) were tested. Results showed that PCFB adsorption of NPs with higher specific surface area resulted in faster adsorption (adsorbed in ~25 mins) with > 99% immobilisation of NPs on the proppant pack. Adsorption kinetics showed reasonable conformity with the pseudo-first-order model, where isothermal adsorption followed the Sips model. The adsorption capacity of magnesia NPs (specific surface area 50 to 80 m2.g-1, 7 wt.% NaCl) at 298.15 K was higher than silica NPs. Accordingly, the newly developed PCFB method can be used for onsite treatment of proppants with nanoparticles, which can then be injected into a fractured formation to achieve multiple objectives such as fines fixation, wettability alteration and sand control. In this work, another study explored the application of nano-treated proppant packs on the adsorption of coal fines, presented in chapter 7. In this study, the objective was to identify silica nano-formulations (0 – 0.1 wt.%), and coal fines concentration of 0.1 to 1 wt.% were examined to determine the fixation of coal fines within the glass bead synthetic proppant pack. The quantitative results showed that the proppant pack with nanoparticle treatment strongly affects the fixation ability of coal fines. The non-NP treated pack yielded 30% adsorption, whilst the NP treated pack yielded 74% adsorption. It was noted that greater adsorption is also related to the higher zeta potential of silica NPs (i.e. nearer to iso-electric point). A set of laboratory experiments on industrial-grade proppants was conducted as the definitive work, presented in chapter 8. The work involved sensitivity experiments as a function of coal rank, pH, salinity, and surfactants. These conductivity results were compared with established analytical models to interpret the mechanistic coal-proppant interaction in the presence of an electrolyte. It was found that fines dispersion and its mobility within the proppant pack is easier at high pH, low salinity, temperature, anionic surfactants, and lower concentration of coal fines. However, fines mobility is reduced at neutral pH, high salinity, temperature, and cationic surfactants.

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Bahlouli, Mohamed Haythem. "Modélisation couplée des écoulements liquide-gaz et de l'hydro-mécanique dans un stockage géologique de déchets radioactifs". Electronic Thesis or Diss., Université de Toulouse (2023-....), 2025. http://www.theses.fr/2025TLSEP028.

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Le stockage géologique profond constitue la solution internationale la plus prometteuse pour la gestion des déchets les plus radioactifs et à durée de vie longue sur de très longues échelles de temps. En France, le projet Cigéo vise à stocker les déchets dits de haute activité (HA), principalement issus des combustibles usés des centrales nucléaires après retraitement et les déchets de moyenne activité à vie longue (MA-VL), qui correspondent aux structures métalliques qui entourent le combustible ou aux résidus liés au fonctionnement et à la maintenance des installations nucléaires. La sûreté du stockage est assurée par un système multi-barrières composé de barrières ouvragées et une roche hôte. Grâce à sa très faible conductivité hydraulique, sa faible diffusion moléculaire et sa capacité significative de rétention des radionucléides, l’argilite du Callovo-Oxfordien (COx) est considérée comme la formation géologique potentielle pour la réalisation du projet. Or, après la fermeture et le scellement de l'installation souterraine, une quantité significative de gaz (principalement de l’hydrogène) peut être générée en raison de plusieurs processus tels que la corrosion anaérobie des métaux, la radiolyse de l'eau et les réactions microbiennes. Si le transitoire hydraulique-gaz des installations souterraines a été très étudié au cours des deux dernières décennies, la représentation de certains processus fortement couplés tels que les écoulements diphasiques multi-composants dans des matériaux poreux très faiblement perméables, à des différentes échelles spatiales et l'hydro-mécanique restent potentiellement complexe. La présente étude a été réalisée à l’Unité d’expertise et de modélisation des installations de stockage, à l'Institut de radioprotection et de sûreté nucléaire. L'objectif était d'améliorer la robustesse des modélisations du comportement hydrodynamique des phases liquide-gaz et traiter la problématique des impacts mécaniques des déformations de la roche et des scellements sur le transport de gaz et vice versa. Seules des simulations numériques sont capables de rendre compte de l’ensemble des phénomènes sur les échelles d’espace et de temps à considérer. Pour cela, deux approches ont été suivies. Une étude analytique de l'écoulement monophasique gaz a été effectuée afin d'évaluer la sensibilité des phénomènes d'écoulement du gaz aux divers paramètres physiques, y compris la compressibilité et l'effet Klinkenberg. Parallèlement, des simulations numériques ont été réalisées sur un modèle d'alvéole de déchets HA. Elles ont permis de mettre en évidence l'évolution de la pression du gaz et la désaturation de la roche hôte et des scellements. Ces simulations prennent en compte la présence de l'air dans la phase gaz, afin d’appréhender le poids d'une atmosphère explosive en lien avec l'inflammabilité de l'hydrogène dans l'air. Ces études étaient aussi le terrain pour introduire des améliorations dans le code TOUGH2 et de développer des outils de pre- et de post- processing qui facilitent l'utilisation de ce code et l'analyse des résultats. Concernant le couplage hydromécanique, une revue bibliographique approfondie est réalisée, et a permis d'isoler les problèmes soulevés par le couplage poro-élastique en présence de gaz. Un modèle d'élasticité linéaire avec un couplage HM basé sur la théorie de Biot est ensuite étudié et implémenté dans le logiciel COMSOL Multiphysics en utilisant la méthode des éléments finis. Des simulations numériques de tests hydro-mécaniques drainés ou non-drainés ont été réalisés. Le couplage a permis de capturer l'interaction entre la variation de pression du fluide et les contraintes et déformations dans la roche poreuse. Un des résultats est la mise en évidence de la production fluide
As a safe long-term management of nuclear waste, deep geological disposal was proposed and is the widely accepted approach to deal with high-level radioactive waste. It is currently being under study in several countries. The long-term safety in a deep geological repository (DGR) is ensured through a multi-barrier system provided by engineered barrier and natural barrier systems. In most multi-barrier system concepts in crystalline and clay rock, argillaceous materials (clay rock or bentonite) are envisaged to use for barrier elements. Due to its very low hydraulic conductivity, low molecular diffusion and significant radionuclide retention capacity, COx claystone is considered as a potential geological host formation for an industrial radioactive waste repository in France. The performance of the host rock and engineered barriers in the construction phase and in a long-term perspective (thousands to million of years) is of primary importance for predicting the risk of dissemination of radioactivity. After the deep geological repository is closed and sealed, significant gas quantity can be generated due to several processes such as the anaerobic metal corrosion, water radiolysis and microbial reactions. Predicting gas flow in low-permeable, saturated materials is a challenging but important task in the risk assessment of a deep geological repository. Pressure build-up and gas migration in host rock and engineered barriers constitute a highly coupled hydro-mechanical (HM) process, and may contribute to the development of preferential gas pathways either by gas-induced micro-fracturing or macro-fracturing. In current numerical studies some behaviors still cannot be well represented, in particular, it is challenging to explain the gas migration behavior in the gas injection tests conducted on the clayey rock and barriers materials. Therefore, to better represent the actual physical process of gas flow, several modeling frameworks are proposed in the present thesis: single-phase gas flow (H2), two-phase water-gas multi-component flow (air, H2), and hydro-mechanical coupling (poro-elasticity). Two-phase gas-water flow in the waste cell model at different scales (a single waste cell contains several High Level Waste containers) is used here to quantitatively study transient hydraulic water-gas phenomena, such as gas pressure evolution and clayey rock desaturation. A wide range of scenarios and hypotheses is tested to assess significant differences between different scenarios in controlling gas migration and the transition from single phase water saturated conditions to two-phase and single phase gas. Although efficient in studying gas migration in presence of hydrogen only, the proposed models has presented a major limitation because of the difficulty in assessing gas phase evolution in presence of air. Multiphase flow of water with a gas phase (hydrogen and air) together with consideration of dissolved hydrogen, air and water vapor diffusion, is studied using equation of state EOS7R (water, brine, RN1, RN2, air) of the TOUGH2 family of codes. We have implemented code enhancements and post-processing scripts, which enhanced our capabilities in analyzing and interpreting results. A separate study of single phase gas flow was developed in order to assess analytically the sensitivity of gas flow phenomena to various rock parameters, including for instance the Klinkenberg effect due to gas slippage at low pressure in tight pores. Concerning the hydromechanical coupling, an extensive review was developed, including poroelastic coupling in the presence of gas. A linear poroelastic model based on Biot theory is studied and implemented in the Finite Elements software COMSOL Multiphysics. The coupling allows us to capture the interaction between fluid pressure variation and the stresses and strains in the porous rock (drained and undrained tests)

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Kampel, Guido. "Mathematical Modeling of Fines Migration snd Clogging in Porous Media". Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19764.

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Mathematical Modeling of Fines Migration and Clogging in Porous Media Guido Kampel 87 Pages Directed by Dr. Guillermo H. Goldsztein A porous medium is a material that contains regions filled with fluid embedded in a solid matrix. These fluid filled regions are called pores or voids. Suspensions are fluids with small particles called fines. As a suspension flows through a porous material, some fines are trapped within the material while others that were trapped may be released. Filters are an example of porous media. We model filters as networks of channels. As a suspension flows across the filter, particles clog channels. We assume that there is no flow through clogged channels. In the first part of this thesis, we compute a sharp upper bound on the number of channels that can clog before fluid can no longer flow through the filter. Soil mass is another example of porous media. Fluid in porous media flows through tortuous paths. This tortuosity and inertial effects cause fines to collide with pore walls. After each collision, a particle looses momentum and needs to be accelerated again by hydrodynamic forces. As a result, the average velocity of fines is smaller than that of the fluid. This retardation of the fines with respect to the fluid may lead to an increase of the concentration of fines in certain regions which may eventually result in the plugging of the porous medium. This effect is of importance in flows near wells where the flow has circular symmetry and thus, it is not macroscopically homogeneous. In the second part of this thesis we develop and analyze a mathematical model to study the physical effect described above. In the third and last part of this thesis we study particle migration and clogging as suspension flows through filters by means of numerical simulations and elementary analysis. We explore the effect that network geometry, probability distribution of the width of the channels and probability distribution of the diameter of the particles have on the performance of filters.

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Kampel, Guido. "Mathematical modeling of fines migration and clogging in porous media". Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19764.

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Thesis (Ph.D)--Mathematics, Georgia Institute of Technology, 2008.
Committee Chair: Goldsztein, Guillermo; Committee Member: Dieci, Luca; Committee Member: McCuan, John; Committee Member: Santamarina, Juan; Committee Member: Zhou, Haomin.

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Jamiolahmady, Mahmoud. "Mechanistic modelling of gas-condensate flow in porous media". Thesis, Heriot-Watt University, 2001. http://hdl.handle.net/10399/532.

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SANTOS, MARCOS PAULO PEREIRA C. DOS. "PORE NETWORK MODEL FOR RETROGRADE GAS FLOW IN POROUS MEDIA". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2017. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=32319@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
A produtividade de poços produtores de gás, que operam com pressões de fundo inferiores à pressão de orvalho, é afetada pelo aparecimento da saturação de líquido em seus entornos. Para entender esse fenômeno, conhecido como bloqueio por condensado, os simuladores em escala de poros são ferramentas úteis na investigação dos parâmetros que influenciam na quantidade e na distribuição da saturação de condensado, assim como seus efeitos na redução do fluxo de gás. Esse trabalho apresenta um modelo de rede de capilares composicional e isotérmico para o estudo do escoamento de gás retrógrado em meios porosos. Forças capilares e gravitacionais não foram consideradas. O escoamento monofásico é comutado para bifásico de padrão anular quando a pressão e a composição do fluido atingem um critério de estabilidade. O método de Newton é aplicado para resolver as equações de fluxo e consistência dos volumes e calcular o transporte de cada um dos componentes ao longo da rede. As propriedades do fluido e o comportamento do escoamento foram testadas contra os resultados de um simulador termodinâmico comercial e soluções analíticas, respectivamente. Após validação, o simulador foi utilizado para obter curvas de permeabilidade relativa gás-líquido através da despressurização de uma rede 2D e alguns resultados são discutidos.
Gas well deliverability in retrograde gas reservoirs is affected by the appearance of liquid saturation around the wellbore when the bottom-hole pressure is below the dew point. Pore-scale simulators are used to model this phenomenon, known as condensate blockage, and to investigate parameters that ifluence the amount and the distribution of condensate saturation, as well as how it chokes the gas flow. Here, a fully-implicit isothermal compositional pore-scale network model is presented for retrograde gas flow in porous media. Capillary and gravitational forces are neglected. The model shifts from single-phase flow to annular flow regime when the pressure and the fluid composition reach a stability criteria. Newton s method is applied on flow and volume consistency equations to calculate the transport of each component through the network. Fluid properties and flow behavior were tested against a commercial thermodynamic simulator and analytical solutions respectively. After validation, the simulator was used to predict gas-liquid relative permeability from a depletion process in a 2D network and some results are discussed.

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Boltze, Uta. "Gas emissions relevant to waste management, through watertables in porous media". Thesis, Imperial College London, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307822.

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Vieira, Rodriguez Cristian. "Calibration of Electrical Methods for Detecting Gas Injection in Porous Media". Paris, Institut de physique du globe, 2013. http://www.theses.fr/2013GLOB1001.

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Gill, Richard T. "Electrokinetic-enhanced migration of solutes for improved bioremediation in heterogeneous granular porous media". Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/12712/.

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Contaminated land is a global problem. Where it presents an unacceptable risk to receptors such as human health or ecosystems, remediation actions must be taken. Current remediation technologies can be ineffective due to mass transfer limitations. A typical scenario where these limitations control remediation efficacy is a physically heterogeneous aquifer where hydraulic conductivity (K) varies spatially. Under these conditions remediation is limited by solute migration across K boundaries. This thesis couples two remediation technologies, in situ bioremediation and electrokinetics (EK), to overcome the mass transfer limitations presented by physically heterogeneous settings. Bioremediation is the transformation of contaminants into less harmful substances by microorganisms; and EK is the application of a direct current to initiate certain transport processes independent of K. Where bioremediation is limited due to the influence of physical heterogeneity, EK transport processes could be applied to initiate an additional flux of solutes across K boundaries. This thesis investigates the influence of physical heterogeneity on EK migration of an amendment designed to enhance bioremediation. The research presented in this thesis advances the current state of knowledge for EK-BIO applications both at the fundamental level and field-scale using laboratory and desk based studies respectively. Laboratory apparatus was designed and built to accommodate physical heterogeneity, electrokinetic transport of solutes and contaminant biodegradation. Broadly, two types of EK experiment were conducted. Firstly, EK amendment migration under abiotic conditions on different arrangements of physical heterogeneity. Secondly, experiments in the same laboratory setup that introduced contaminant and microbial variables. From these experiments a conceptual framework is developed that describes the influence of physical heterogeneity on the EK transport of an amendment. It relates the spatial change in material properties associated with physical heterogeneity with aspects of EK application, such as the voltage gradient, and observes the implications for amendment transport. For example a layered contrast in material type generated a non-uniform electric field when direct current was applied, this led to non-uniform EK transport of the amendment relative to homogeneous settings. When contaminant and microbial variables were introduced to the experimental setup a greater understanding of EK-BIO applications to physically heterogeneous settings was gained. These experiments highlight and discuss the technical issues applying EK to enhance bioremediation by amendment addition versus contaminant removal by EK induced pore fluid movement. Desk based studies included a review of EK-BIO literature and a sustainability assessment that considered EK-BIO at the field scale. The review summarises the practical aspects of the technology in applications to natural environments. It notes that numerous limitations exist to EK-BIO applications in these settings but that there are many different implementation methods that can mitigate these effects. The sustainability assessment compares EK-BIO with conventional remediation technologies against specific criteria for a complex site contaminated with BTEX and MTBE. EK-BIO compares well to other technologies however characteristics of the site will determine the potential sustainability benefits of applying EK.

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Shiko, Elenica. "NMR and gas sorption studies of structure-transport relationships in porous media". Thesis, University of Bath, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.582800.

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The work in this thesis is focused on testing the accuracy of the gas sorption and NMR cryoporometry characterization techniques to estimate the key pore descriptors which affect the activity of porous materials used as catalyst supports and drug delivery systems. Both techniques, though, assume independent pores, neglecting advanced adsorption and melting phenomena that can specifically skew the pore size distribution and subsequently lead to inaccurate predictions of catalytic or therapeutic efficiency of the porous system. Firstly, the independent domain theory for both processes was studied by breaking down the pore-filling process of a mesoporous catalyst support, into steps. The system was partially saturated with water or cyclohexane at different pressures, via adsorption and desorption, followed by a cryoporometry experiment at each saturation fraction. Moreover, scanning curves and loops, together with PFG NMR and relaxometry were employed to ascertain the spatial arrangement of the liquid ganglia at each partial saturation and for certain molten fractions. It was shown that the configuration of the liquid condensates varied with position around the hysteresis loop, deviating from the single pore hysteresis mechanism for both adsorbates. Advanced melting of water was associated with a percolation-type transition in the connectivity of the ganglia, which could be curtailed to some extent by sample fragmentation. Also, some pores filled via advanced adsorption at lower pressures. On the contrary, advanced melting of cyclohexane arose from the liquid bridging the pore cross-sections of the partially filled pores. Secondly, an integrated nitrogen-water-nitrogen experiment was employed to test the source of sorption hysteresis and to compare the extent of advanced adsorption phenomena for nitrogen and water sorption, by isolating a subset of pores. It was found that the Kelvin-Cohan equations and the DFT algorithm overestimate the width of the sorption hysteresis in independent pores of the catalyst support studied in this work. Moreover, the adsorption mechanism of nitrogen differs to that of water, and advanced adsorption of nitrogen is less severe than that of water. Thirdly, cryodiffusometry and gas sorption techniques were used to estimate the pore space descriptors (surface area, pore size, tortuosity, porosity) of two different types of mesoporous silicas, candidates for drug delivery. The structure-transport relationships in these materials were investigated to interpret the drug release profiles obtained for release studies carried out in simulated gastrointestinal fluids. It was found that the release rate was mainly controlled by the size of the silica particles and the silica solubility itself in the environment present. Also, different synthesis routes were tested to optimize the drug loaded PLGA nanoparticles, for convection-enhanced drug delivery into the brain. Various model and real hydrophobic and hydrophilic drugs were tested. In-vitro and in-vivo studies showed that the dialysis method led to production of particles with the desirable characteristics, which were successfully distributed in the mice brain. The sensitivity of the cryoporometry melting, gas sorption and imaging techniques was found inadequate to resolve the inner structure of the polymer matrix. Last, the experimental time for the cryodiffusometry experiments in this work was long due to the high recycle delay times required to maximise the signal to noise ratio. It is though found that high delay times are unnecessary when BBP-LED pulse sequence is used, even when the fluid is imbibed in a mesoporous systems.

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Libri sul tema "Gas migration in porous media"

Li, Dang, e Junbin Chen. Mechanics of Oil and Gas Flow in Porous Media. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-7313-2.

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Koponen, Antti. Simulations of fluid flow in porous media by lattice-gas and lattice-Boltzmann methods. Jyväskylä: University of Jyväskylä, 1998.

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Stanisław, Jucha, a cura di. The Flows of fluids in the porous media: Proceedings of the international symposium = Przepływy płynów w ośrodkach porowatych materiały : miedzynarodowego sympozjum. Kraków: Wydawn. AGH, 1986.

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Guo, Weixing. Numerical simulation of coupled heat transfer and gas flow in porous media with applications to acid mine drainage. University Park, PA: Dept. of Geosciences, Pennsylvania State University, 1993.

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Thomas, Lee W. Three-phase dynamic displacement measurements of relative permeability in porous media using three immiscible liquids: A thesis in Petroleum and Natural Gas Engineering. Springfield, Va: Available from the National Technical Information Service, 1991.

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Ho, Clifford K., e Stephen W. Webb. Gas Transport in Porous Media. Springer London, Limited, 2006.

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Ho, Clifford K., e Stephen W. Webb, a cura di. Gas Transport in Porous Media. Springer Netherlands, 2006. http://dx.doi.org/10.1007/1-4020-3962-x.

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Ho, Clifford K., e Stephen W. Webb. Gas Transport in Porous Media. Springer, 2008.

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Ho, Clifford K., e Stephen W. Webb. Gas Transport in Porous Media. Springer Netherlands, 2010.

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Khilar, Kartic C. Migration of fines in porous media. 1998.

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Capitoli di libri sul tema "Gas migration in porous media"

Meakin, Paul, Geri Wagner, Vidar Frette, Torstein Jøssang, Jens Feder e Aleksandar Birovljev. "Gradient-Driven Migration in Porous Media: Experiments and Simulations". In North Sea Oil and Gas Reservoirs — III, 297–305. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0896-6_26.

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Wu, Lei. "Porous Media Flow". In Rarefied Gas Dynamics, 209–16. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2872-7_12.

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Marcelis, Fons, e Steffen Berg. "North Netherlands Gas Reservoir". In Album of Porous Media, 39. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-23800-0_27.

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Alhosani, Abdulla, Branko Bijeljic e Martin Blunt. "Disconnected Gas Flow in Hydrophobic Porous Media". In Album of Porous Media, 110. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-23800-0_90.

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Chakraborty, Nirjhor, e Zuleima Karpyn. "Adsorption Enhanced Gas Uptake in Nanodarcy Permeability Shale". In Album of Porous Media, 105. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-23800-0_85.

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Gao, Ying, Ab Coorn, Niels Brussee, Hilbert van der Linde e Steffen Berg. "Gas Trapped in the Pore Space of a Sandstone". In Album of Porous Media, 108. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-23800-0_88.

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Singh, Ashok, e Olaf Kolditz. "Gas Flow". In Thermo-Hydro-Mechanical-Chemical Processes in Porous Media, 149–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27177-9_8.

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Chen, Qiang, Shaobo Diao e Yuguang Ye. "Detecting Hydrate in Porous Media Using Electrical Resistance". In Natural Gas Hydrates, 127–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31101-7_4.

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Chen, Qiang, Shaobo Diao e Yuguang Ye. "Thermophysical Properties of Gas Hydrate in Porous Media". In Natural Gas Hydrates, 141–67. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31101-7_5.

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Niblett, Daniel, Vahid Niasar, Adrian Mularczyk e Jens Eller. "Droplet Detachment from a gas Diffusion Layer of a Pem Fuel Cell". In Album of Porous Media, 136. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-23800-0_113.

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Atti di convegni sul tema "Gas migration in porous media"

Lopuh, Nazariy, e Yaroslav Pyanylo. "Simulation of Gas Filtration Processes in Fractured-Porous Media". In 2024 14th International Conference on Advanced Computer Information Technologies (ACIT), 107–11. IEEE, 2024. http://dx.doi.org/10.1109/acit62333.2024.10712605.

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Albaba, Mhd Taisir, Jamal Hannun e Riyadh Al-Raoush. "Impact of Pore Morphology on Colloid Migration at Variable Saturation Levels of Natural Porous Media". In The 2nd International Conference on Civil Infrastructure and Construction. Qatar University Press, 2023. http://dx.doi.org/10.29117/cic.2023.0167.

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The migration of colloids within porous media has a critical impact on many important industrial processes such as oil production and groundwater recharge. Colloids can clog the pore space and hence impair the permeability of fluids which adversely impacts the efficiency of fluids movement through such media. Therefore, understanding the mechanisms of pore clogging at the pore-scale is critical to develop efficient remediation methodologies for permeability reduction at different physio-chemical conditions. To study pore clogging at a pore-scale, microfluidic chips were fabricated to mimic geometries of natural porous media extracted from tomographic scans of sand packs. A colloidal suspension was injected in three phases into the system. The phases consisted of an initial imbibition of the suspension, followed by drainage of the suspension from the system, and finally, a second imbibition. During each phase, a series of images are taken of a section of the porous media. Findings reveal that pore-clogging considerably impairs saturation levels of the porous media through blocking the flow from reaching the gas phase within the system. Considerably increasing the time the gas is trapped in the pore-space, which in turn develops higher irreducible water saturation. This was also observed in the case of drainage of the colloidal suspension from the pore-space where colloids blocked pathways of the gas phase and prevented its migration through the pore space. In contrast, the migration of colloids was also impacted by the presence of the gas phase. Gas provided a clogging surface while forcing colloids to migrate through the pore space and accumulate at other pores. This implies that gas phase presence within a low porosity system can increase pore clogging at a significant rate. This is also supported by the short period between the clogging of two pores and the clogging of a dozen pores within the observed system.

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Hannun, Jamal, e Riyadh Al-Raoush. "Retention of Hydrophobic Colloids in Unsaturated Porous Media using Microfluidics". In The 2nd International Conference on Civil Infrastructure and Construction. Qatar University Press, 2023. http://dx.doi.org/10.29117/cic.2023.0177.

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Water recharge wells can provide a solution for 3.5 billion people, living in regions suffering from water scarcity. Due to fines migration, freshwater wells that are used to recharge aquifers, often experience expedited deterioration. Colloidal clay fine particles can be mobilized from within aquifers due to hydrodynamic forces or the sweeping of gas-water interface (GWI). The released colloids concentration increases then starts to retain and clog at the pores within the aquifer formation. Although fines migration is responsible for decommissioning many recharge wells, yet there is a lack of pore scale observations that uncover clogging mechanisms within porous media. Thus, this study utilizes wide-field optical macroscopy and microfluidic models with pore morphology of sandstone, to investigate the clogging mechanisms of hydrophobic colloids. The aim is to discover how interfacial surfaces within porous media retain colloids. Hence imbibition and drainage of colloidal suspension were carried to vary water saturation. Flow experiments were imaged at a resolution of 1µm/pixel, while colloids diameter was 5 µm. Images were segmented into solid, water, gas and colloids. Then the amount of colloids retained on each interface was quantified. Findings revealed that hydrophobic colloids retained mainly on the GWI. For colloids suspension in deionized water, affinity of colloids to GWI was high enough to cause bubble stabilization. In both hydrophobic and hydrophilic porous media, colloids disconnected the gas phase to create larger GWI surface. More than 90% of hydrophobic colloids were cleaned from the media after drainage, uncovering an efficient remediation technique for water aquifer.

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Tanaka, Yukihisa. "Development of Numerical Simulation Method for Gas Migration Through Highly-Compacted Bentonite Using Model of Two-Phase Flow Through Deformable Porous Media". In ASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2010. http://dx.doi.org/10.1115/icem2010-40012.

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In the current concept of repository for radioactive waste disposal, compacted bentonite will be used as an engineered barrier mainly for inhibiting migration of radioactive nuclides. Hydrogen gas can be generated inside of the engineered barrier by anaerobic corrosion of metals used for containers, etc. It is expected to be not easy for gas to entering into the bentonite as a discrete gaseous phase because the pore of compacted bentonite is so minute. Therefore it is necessary to investigate the effect of gas pressure generation and gas migration on the engineered barrier, peripheral facilities and ground. In this study, a method for simulating gas migration through the compacted bentonite is proposed. The proposed method can analyze coupled hydrological-mechanical processes using the model of two-phase flow through deformable porous media. Validity of the proposed analytical method is examined by comparing gas migration test results with the calculated results, which revealed that the proposed method can simulate gas migration behavior through compacted bentonite with accuracy.

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Zhang, Zheng, Zhenhua Rui, Yueliang Liu e Yang Zhao. "Monitoring and Quantification of Trapped CO2 in Porous Media: A Low-Field Online NMR Investigation on CO2 Flooding And Sequestration of Low Permeability Reservoir". In International Petroleum Technology Conference. IPTC, 2025. https://doi.org/10.2523/iptc-24967-ms.

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Abstract Low-field online Nuclear Magnetic Resonance (LF-NMR) technology has been extensively used to describe hydrogen content in pores during CO2 injection. However, spatial migration and existence form of injected CO2 in porous media are still unclear. NMR combined with micro-gas measurement was used to quantify CO2 of different states to evaluate the capacity and security of CO2 sequestration. Moreover, fluid-rock interactions and mass transfer were considered to reveal the migration and evolution mechanism of injected CO2. In this work, quantitative CPMG scanning was done and T2 distribution of hydrocarbon in porous media was obtained and CO2 produced was measured to quantify CO2 in free and dissolved state during constant rate CO2 injection. Considering pressure variation from injectors to producers in reservoir condition, pressure-dependent CO2 injection was designed to obtain CO2 migration law and mass transfer in pores of different radius. On the other hand, depressurizing experiment was done to simulate CO2 exsolution from hydrocarbon and determine dissolubility trapped CO2. For low permeability rock sample, CO2 first occupied medium pores and macropores after injection, and then expanded to micropores with smaller radius. It was shown that injection pressure is the main factor that controls the direction of CO2 migration because pressure condition reflects phase behavior of CO2. For gaseous CO2 (pressure lower than critical point), only large pores were swept. When the system pressure is much higher than supercritical pressure, micropores were activated for CO2 sequestration. More interestingly, the volume of CO2 in free state increased rapidly when gaseous CO2 was transforming to supercritical phase. Compared with free state CO2, dissolved CO2 in liquid phase depends on saturation pressure. When the pressure was much higher than saturation pressure, solubility trapping in porous media showed great stability. As the pressure was decreased to a value lower than saturation pressure of fluid in pores, CO2 started to exsolve from liquid phase in large volume. Moreover, CO2 preferentially exsolve from micropores first. This work proposes a method to quantify the states of CO2 exists in porous media and illustrates that injection pressure was dominant to control migration and evolution of CO2. In this work, equipped with NMR technology, CO2 injection and depressurizing experiments were done to monitor and characterize dynamic dissolution and exsolution of CO2 in different pores.

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Zhang, Jian, Zhe Sun, Xiujun Wang e Xiaodong Kang. "Study on the Oil Displacement Effect and Application of Soft Microgel Flooding Technology". In SPE Middle East Oil & Gas Show and Conference. SPE, 2021. http://dx.doi.org/10.2118/204764-ms.

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Abstract Due to the reservoir heterogeneity, there is still a lot of remaining oil that cannot be displaced by water flooding. Therefore, taking the whole injection-production flow field as the research object, the dominant channel is divided into macro and micro channel. Then the corresponding oil displacement system is adopted to realize the continuous flow diversion and effective expansion of swept volume. For micro channels, the soft microgel particle dispersion can be used. It is a novel flooding system developed in recent years. Due to its excellent performance and advanced mechanism, the oil recovery rate can be greatly improved. Soft microgel particle dispersion consists of microgel particles and its carrier fluid. After coming into porous media, its unique phenomenon of particle phase separation appears, which leads to the properties of "plugging large pore and leave the small one open", and the deformation and migration characteristic in the poros media. Therefore, particle phase separation of soft microgel particle dispersion is studied by using the microfluidic technology and numerical simulation. On this basis, by adopting the NMR and 3D Printing technology, the research on its oil displacement mechanism is further carried out. Furthermore, the typical field application cases are analyzed. Results show that, soft microgel particles have good performance and transport ability in porous media. According to the core displacement experiment, this paper presents the matching coefficient between microgels and pore throat under effective plugging modes. Also, the particle phase separation happens when injecting microgels into the core, which makes the particles enter the large pore in the high permeability layer and fluid enters into small pore. Therefore, working in cooperation, this causes no damage to the low permeability layer. On this basis, theoretically guided by biofluid mechanics, the mathematical model of soft microgel particle is established to simulate its concentration distribution, which obtained the quantitative research results. Furthermore, the micro displacement experiment shows that, microgels has unique deformation and migration characteristic in the poros media, which can greatly expand swept volume. The macro displacement experiment shows that, microgels have good oil displacement performance. Finally, the soft microgel particle dispersion flooding technology has been applied in different oilfields since 2007. Results show that these field trials all obtain great oil increasing effect, with the input-output ratio range of 2.33-14.37. And two field application examples are further introduced. Through interdisciplinary innovative research methods, the oil displacement effect and field application of soft microgel particle dispersion is researched, which proves its progressiveness and superiority. The research results play an important role in promoting the application of this technology.

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Nishad, Safna, e Riyadh Al-Raoush. "Micromodel Study on Pore Scale Mechanisms associated with Permeability Impairment in Porous Media". In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0071.

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Recently, researchers have been attracted towards the gas production from hydrate bearing sediments considering its abundance in marine continental margins and persisting demand for alternate energy. Dissociation of hydrate into gas and water is the preliminary technique for gas production in hydrate bearing sediments. Expanded fluid volume and gas pressure upon dissociation detach the fines from the grain surface and result in pore throat entrapment. Migration of fines associated with gas flow greatly influence the alteration of permeability of the sediment by clogging pore throats in the flow path. A pore-scale visualization study was implemented to provide a clear insight into the actual mechanisms associated with mobilization and clogging of fines during two-phase flow through a microfluidic chip. Carboxylate modified polystyrene latex particles deposited in the porous media were migrated during drainage with CO2 gas. The detachment of fine particles from the grain surfaces was observed and were retained on the new interface; gas-water interface. The images and videos captured during the experiment were helpful in observing additional pore scale mechanisms responsible for permeability impairment in the porous media. Interface pinning, deformation and resistance to coalescence were found to be other mechanisms in addition to pore clogging.

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Zhang, Ruihua, Guohua Chen e Si Huang. "A Multiphase Mixture Flow Model and Numerical Simulation for the Release of LPG Underground Storage Tank in Porous Environment". In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26415.

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A physical process and mechanism of liquefied petroleum gas (LPG) flow dispersion in porous media for the releases at vapor and liquid region of Underground Storage Tank (UST) was analyzed. On the basis of the mixture model principle, a mathematical model was developed to simulate LPG flow dispersion in porous media. The gravity, capillary force, viscous force, interior resistance of porous media and gas-liquid interaction were incorporated into this model. And the non-Darcy coefficient of multiphase flow which is variable with Reynolds number was taken into account in the model, which was according with actual flow state. For LPG is insoluble in water, the formulation of LPG volumetric concentration was deduced, which simplifies computation process. The model was carried out to simulate a propane gas migration process in sand pond for UST release. From the simulation results, a detailed analysis was performed to investigate the effect of various influencing factors on infiltration flow: the direction of gas infiltration diffusion is influenced distinctly by gravity, release direction and the position of outlet in tank pond; the flow about release site and outlet is more active where the non-Darcy effect is obvious; the pressure drive is crucial for LPG infiltration; the gravity is a main factor to water infiltration; the saturation and viscous force of water can restrain the infiltration speed of propane. The model can lead to a good understanding of flow development and field effects of LPG in unsaturated porous media and can offer boundary conditions for modeling the subsequent fire explosion accidents.

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Elrahmani, Ahmed, e Riyadh I. Al-Raoush. "The Dependent Clogging Dynamics and Its Impact on Porous Media Permeability Reduction". In The 2nd International Conference on Civil Infrastructure and Construction. Qatar University Press, 2023. http://dx.doi.org/10.29117/cic.2023.0152.

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The dynamics of fine particle entrapment, transport, and deposition within pore systems, particularly the ability of mobile fines to impair permeability within porous media, are critical to a variety of natural and manmade phenomena, impacting oil and gas recovery, slope stability, filter capacity, and the efficiency of lab-on-chip diagnostics in medical disciplines. According to the research, clogging of pore throats in the porous media is not a random process; clogged throats, in particular, modify flow conditions and promote subsequent clogging nearby which is called dependent clogging. Over the last several decades, significant efforts have been made to identify and parameterize the role of dependent clogging in permeability reduction, with studies applying a combination of physical investigation and numerical simulation to this objective. In this work, we deploy a coupled computational fluid dynamics-discrete element method-based framework to investigate fines migration and consequent pore-throat clogging within a geologically realistic pore system extracted from an x-ray microtomographic image of a sand pack. The analysis of the simulation results revealed a spatial correlation between the clogged throats, implying that throats in close proximity became clogged dependently around the same time. Furthermore, dependent clogging was observed to be more frequent than independent clogging and it impacts system permeability more efficiently. This suggests that the distribution of clogged throats has a significant impact on the system's permeability reduction other than the total number of clogged throats.

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Dai, Q., Y. Meng, K. Duan e C. Y. Kwok. "Development of Multiphase Flow Simulation Method in DEM Under a Fixed-Grain Condition". In 57th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2023. http://dx.doi.org/10.56952/arma-2023-0532.

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ABSTRACT Understanding multiphase flow mechanisms in porous media is vital for many engineering practices, such as geo-logical carbon sequestration. Existing numerical models that use the explicit pressure-solving scheme can only advance multiphase flow with a small timestep. None of them manages fast fluid transport due to a stability issue limiting timestep selection. This paper focuses on developing a fluid flow model that can quickly and efficiently capture fluid–fluid displacement patterns. We incorporate the implicit finite volume approach that is unconditionally stable to transport fluid with a remarkable timestep. To enhance interface–motion capture under various capillary number and viscosity ratio combinations, we set a flow front advancement criterion to reduce timestep when the injected fluid invades beyond front–line pores. Additionally, we update the flow front, pore pressure, and capillary entry pressure at every timestep to reveal more flow pattern details. We validate the model through a Darcy flow test and a fluid injection test based on existing Hele–Shaw tests. Numerical results agree well with the analytical solutions and experimental observations, confirming that the developed model is reliable for analyzing fluid migration problems and evaluating dynamic multiphase flow interactions in porous media. INTRODUCTION Geological CO2 sequestration is a crucial strategy for achieving carbon neutrality that stores greenhouse gas in geological formations, such as deep saline aquifers and depleted oil/gas reservoirs (Bradshaw et al., 2007; Bachu, 2008). Understanding how the injected CO2 migrates in geological media is vital to ensure successful CO2 geological storage. The injected CO2 will build up pore pressure and replace the existing pore fluid, remarkably altering the material properties (Sun et al., 2016) and pore structure (Yu et al., 2019). The pressure build-up during the injection process may trigger disasters, such as fault reactivation (White et al., 2014) and even earthquakes (Zoback and Gorelick, 2012), leading to CO2 leakage. To optimize CO2 injectivity and storage safety, it is thus essential to study multiphase flow mechanisms of fluid injection in porous media.

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Rapporti di organizzazioni sul tema "Gas migration in porous media"

Oldenburg, Curtis M. EOS7CA Version 1.0: TOUGH2 Module for Gas Migration in Shallow Subsurface Porous Media Systems. Office of Scientific and Technical Information (OSTI), marzo 2015. http://dx.doi.org/10.2172/1225362.

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S. Finsterle, J. T. Fabryka-Martin e J. S. Y. Wang. Migration of Water Pulse Through Fractured Porous Media. Office of Scientific and Technical Information (OSTI), giugno 2001. http://dx.doi.org/10.2172/786566.

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Noordally, E., J. M. Przybylski e J. J. Witton. Porous Media Combustors for Clean Gas Turbine Engines. Fort Belvoir, VA: Defense Technical Information Center, dicembre 2004. http://dx.doi.org/10.21236/ada429813.

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Abriola, Linda M., Avery H. Demond e Robert Glass. The Migration and Entrapment of DNAPLs in Physically and Chemically Heterogeneous Porous Media. Office of Scientific and Technical Information (OSTI), giugno 1999. http://dx.doi.org/10.2172/827039.

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ABRIOLA, Linda M., e Avery H. DEMOND. THE MIGRATION AND ENTRAPMENT OF DNAPLS IN PHYSICALLY AND CHEMICALLY HETEROGENEOUS POROUS MEDIA. Office of Scientific and Technical Information (OSTI), giugno 2000. http://dx.doi.org/10.2172/827041.

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Hudson, G. B., e J. E. Moran. Delineation of Fast Flow Paths in Porous Media Using Noble Gas Tracers. Office of Scientific and Technical Information (OSTI), marzo 2002. http://dx.doi.org/10.2172/15006862.

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Abriola, L. M., e A. H. Demond. The migration and entrapment of DNAPLs in physically and chemically heterogeneous porous media. 1998 annual progress report. Office of Scientific and Technical Information (OSTI), giugno 1998. http://dx.doi.org/10.2172/13605.

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Foh, Stephen, N. Poonawala e J. Pritchett. PR-4-172-R01 Modeling of Mixing in Porous Media. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), novembre 1985. http://dx.doi.org/10.55274/r0011433.

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The objective of this work was to define potential problems for storage field operators who stored non-traditional (supplemental) gas supplies (imported LNG, synthetic natural gas, peakshaving gases, etc.) in reservoirs originally using natural gas from traditional sources. Findings indicated that changes in storage field performance could be expected, including changed field inventory, deliverability and base gas requirements. The degree to which supplemental and traditional gases mix in storage reservoirs was identified as the key issue with respect to accounting for and dealing with these changes. The development of a reservoir simulator capable of handling gas-phase mixing in porous media was recommended. Such a model should account for mixing due to gravity segregation and hydrodynamic dispersion.

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Abbas Firoozabadi. WETTABILITY ALTERATION OF POROUS MEDIA TO GAS-WETTING FOR IMPROVING PRODUCTIVITY AND INJECTIVITY IN GAS-LIQUID FLOWS. Office of Scientific and Technical Information (OSTI), dicembre 2003. http://dx.doi.org/10.2172/834360.

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