Presentation materials
We provide an original experimental approach to induce controlled freezing and thawing at a solid-liquid interface in view of imaging the process at nano-scale resolution. The study is framed in the broad context of the assessment of the key drivers promoting ice formation in the presence of a substrate such as minerals. In this sense, observing and quantifying formation and behavior of ice at...
Nuclear Magnetic Resonance (NMR) relaxometry and Magnetic resonance Imagery (MRI) are well-established powerful tools for probing behavior of states of liquid in porous media. For years, the Navier laboratory has developed an innovative methodology to follow water transfer in porous media by this non-invasive and time resolved approach: dynamic NMR relaxometry (fig. (a), [1]), based on the...
Tomographic flow field analysis using positron emission tomography (PET) has become an important method for identifying pore-scale heterogeneities. Diffusive flux [1] and advective transport [2] can be quantified using conservative tracers, and even local flow field changes due to reactions such as dissolution or precipitation can be quantitatively characterized. Reactive tracers, in...
Micro-CT is a unique technology to non-destructively investigate the internal structure of geological samples, spanning a range from centimeter to micrometer scale. The non-destructive nature makes the technique ideal for studying dynamic processes, allowing to visualize geological material behavior when exposed to external conditions like temperature, pressure or to certain fluids. Time...
During the process of geological CO2 storage, the injection of CO2 can lead to the creation of a reservoir environment enriched with carbonic acid. If the reservoir brine contains high concentrations of chloride (Cl-) and sulfate (SO42-) ions, low-pH environments rich in these ions may also develop. Assessing the risk of CO2 leakage through internal cracks in wellbore cement necessitates a...
During the flow of a matrix-dissolving fluid through porous media, positive feedback between flow and reaction generates diverse, evolving structures [1]. These range from intricate, cave-like wormholes to simple surface dissolution patterns. The dynamics of this hydrochemical instability depend on both flow rate and the geometric properties of the pore space. While the effects of flow and...
Nanomaterials have been extensively applied for subsurface science and engineering. Generally, challenges arise due to the aggregation and deposition in the subsurface environments. The retention of the nanomaterials before the target zone reduces the amendment effectiveness and the hydraulic conductivity of the formation being treated. In this study, Pickering nanodroplet is demonstrated as...
Oilwell cement is a weak point in wellbores used for extracting geothermal resources. It can be corroded by acidic gas such as H2S under high-temperature. Previous studies have primarily focused on the immersion corrosion or one-phase corrosion of oilwell cement in H2S solutions, while corrosion along existing cracks requires attention. Given this, this study conducted experiments on the...
Water infiltration in buildings is an increasing issue that has intensified with climate change : weather conditions (floodings, storms) are progressively becoming more intense and may cause a faster deterioration of buildings. In order to analyze the consequences of wind driven rain on built materials, the impact of rainfall on an inclined porous surface is observed at droplet scale. The...
Fluid flows in porous media play a crucial role in both natural and industrial processes, such as underground hydrogen storage for renewable energy and water-gas management in fuel cells. Intricate pore geometries drive complex, multi-scale dynamics in phenomena such as multiphase and viscoelastic flows. Accurate modeling of these flows is challenging however, as numerical simulations are...
Dynamic water pressure caused by tire loads accelerates the deterioration of asphalt pavements, leading to water damages and material failure. Understanding water flow dynamics within the voids of asphalt mixtures during cyclic loading is essential for improving pavement performance in rainy regions.
This study developed an in-situ dynamic water flow testing setup within a Fast CT scanning...
The accurate determination of relative permeability is crucial for characterizing multiphase flow in porous media, with direct implications for reservoir simulation and enhanced oil recovery strategies. Traditional methods, such as the Johnson-Bossler-Naumann (JBN) unsteady-state approach, primarily focus on core outlet measurements. This study introduces an extended JBN method that enables...
Indentation is a commonly encountered boundary value problem in infrastructure, petroleum and manufacturing. It is often utilised as a common way to approach the problem of drilling which is typically decoupled into one of indentation and cutting process. The interrupted indentation tests are generally used to study the deformation at multiple length scales and these are the basic markers for...
Dual-energy computed tomography (DECT), a non-destructive characterization method of geological samples, has been used for estimating the effective atomic number (
