A5034907105- Enhanced Oil Recovery Techniques
- Hydrocarbon exploration and reservoir analysis
- CO2 Sequestration and Geologic Interactions
- Seismic Imaging and Inversion Techniques
- Hydraulic Fracturing and Reservoir Analysis
- Groundwater flow and contamination studies
- Reservoir Engineering and Simulation Methods
- Methane Hydrates and Related Phenomena
- Lattice Boltzmann Simulation Studies
- Drilling and Well Engineering
- Mineral Processing and Grinding
- NMR spectroscopy and applications
- Geological Modeling and Analysis
- Computational Physics and Python Applications
- Fluid Dynamics and Vibration Analysis
- Ion-surface interactions and analysis
- Theoretical and Computational Physics
- Boron Compounds in Chemistry
- Atmospheric and Environmental Gas Dynamics
- Nuclear Physics and Applications
- Geological formations and processes
- Radioactive element chemistry and processing
- Mass Spectrometry Techniques and Applications
- Seismic Waves and Analysis
- Integrated Circuits and Semiconductor Failure Analysis
Stanford University
2022-2024
Palo Alto University
2023
Imperial College London
2019-2022
Abstract Successful deployment of geological carbon storage (GCS) requires an extensive use reservoir simulators for screening, ranking and optimization sites. However, the time scales GCS are such that no sufficient long-term data is available yet to validate against. As a consequence, there currently solid basis assessing quality with which dynamics large-scale operations can be forecasted. To meet this knowledge gap, we have conducted major validation benchmark study. achieve reasonable...
Abstract Representative elementary volumes (REVs) are an important concept in studying subsurface multiphase flow at the continuum scale. However, fluctuations currently not represented scale models, and their impact REV‐scale is unknown. Previous pore‐scale imaging studies on these were limited to small samples with mm‐scale diameters order of ∼0.5 cm 3 . Here, we image steady‐state co‐injection experiments a one‐inch diameter core plug sample, nearly two orders magnitude larger volume (21...
Subsurface fluid flow is ubiquitous in nature, and understanding the interaction of multiple fluids as they within a porous medium central to many geological, environmental, industrial processes. It assumed that pathways each phase are invariant when modeling subsurface using Darcy's law extended multiphase flow, condition be valid during steady-state flow. However, it has been observed intermittent exist at steady state even low capillary numbers typically encountered subsurface. Little...
Understanding multi-scale heterogeneity in porous media has become increasingly critical as the world transitions from fossil fuel production to geological storage of CO2 and H2 for climate change mitigation. This commentary examines why small-scale heterogeneities have taken on a heightened importance modeling subsurface fluid migration. We identify three key factors: increased public scrutiny stricter permitting requirements projects, different risk tolerances requiring long-term...
Abstract Many subsurface fluid flows, including the storage of CO 2 underground or production oil, are transient processes incorporating multiple phases. The fluids not in equilibrium meaning macroscopic properties such as saturation and pressure vary space time. However, these flows traditionally modeled with (or steady‐state) flow properties, under assumption that pore‐scale dynamics equivalent. In this work, we used fast synchrotron X‐ray tomography 1 s time resolution to image...
Successful deployment of geological carbon storage (GCS) requires an extensive use reservoir simulators for screening, ranking and optimization sites. However, the time scales GCS are such that no sufficient long-term data is available yet to validate against. As a consequence, there currently solid basis assessing quality with which dynamics large-scale operations can be forecasted. To meet this knowledge gap, we have conducted major validation benchmark study. achieve reasonable scales,...
The use of Darcy's law to describe steady-state multiphase flow in porous media has been justified by the assumption that fluids continuously connected pathways. However, a range complex interface dynamics have observed during macroscopically flow, including intermittent pathway where pathways periodically disconnect and reconnect. physical mechanisms controlling this behavior remained unclear, leading uncertainty concerning occurrence different regimes. We observe fraction is dependent on...
Wettability is a key factor influencing multiphase flow in porous media.In addition to the average contact angle, spatial distribution of angles along medium important, as it directly controls connectivity wetting and non-wetting phases.The controlling factors may not only relate surface chemistry minerals but also their texture, which implies that length-scale range from nanometres centimetres has be considered.So far, an integrated workflow addressing wettability consistently through...
Abstract We use fast synchrotron X‐ray microtomography to understand three‐phase flow in mixed‐wet porous media design either enhanced permeability or capillary trapping. The dynamics of these phenomena are key importance subsurface hydrology, carbon dioxide storage, oil recovery, food and drug manufacturing, chemical reactors. study the a water‐gas‐water injection sequence carbonate rock. During initial waterflooding, water displaced from pores all size, indicating system with local contact...
Abstract Understanding the interaction between competing fluids in pore space of rocks is key for predicting subsurface flow and trapping, such as with CO 2 a saline aquifer. These processes occur over large span timescales (from seconds to thousands years), length scales microns kilometers). link these temporal spatial will enable us interpolate observations made at different resolutions. In this work we explore present during macroscopically steady‐state multiphase porous carbonate rock...
Abstract Complex pore‐scale dynamics have been observed during multiphase flow through porous rocks. These are not incorporated in large scale models for the migration and trapping of subsurface fluids such as CO 2 or hydrogen. We show that fluctuations pressure measured at core‐scale (centimeters) can reflect fluid displacements (millimeters). The spectral characteristics data shown to depend on dynamics, size rock sample, heterogeneity pore space. results data, transformed into...
High molecular weight polymers are widely used in oilfield applications, such as chemical enhanced oil recovery (cEOR) technique for hydrocarbon recovery. However, during flow a porous rock, polymer retention is usually major challenge, it may result the decrease of concentration or lead to plugging pores with significant permeability reduction and injectivity loss. Hence, an understanding mechanisms will have profound effect optimizing process flooding, particular, carbonate rocks, which...
Subsurface fluid flow is ubiquitous in nature, and understanding the interaction of multiple fluids as they within a porous medium central to many geological, environmental, industrial processes. It assumed that pathways each phase are invariant when modelling subsurface using Darcys law extended multiphase flow; condition be valid during steady-state flow. However, it has been observed intermittent exist at even low capillary numbers typically encountered subsurface. Little known about pore...
Many subsurface fluid flows, including the storage of CO underground or production oil, are transient processes incorporating multiple phases. The fluids not in equilibrium meaning macroscopic properties such as saturation and pressure vary space time. However, these flows traditionally modelled with (or steady-state) flow properties, under assumption that pore scale dynamics equivalent. In this work, we used fast synchrotron X-ray tomography 1s time resolution to image transitioned...
The need for accurate, consistent and fast image processing has become an important part of the investigation multiphase flow through porous media. We describe open-source workflow written in python, using sci-kit toolbox. demonstrate methodology to segment multiple fluids (gas brine), rock grains a Bentheimer sandstone. This can be adapted many applications.
The use of Darcys law to describe steady-state multiphase flow in porous media has been justified by the assumption that fluids continuously connected pathways. However, a range complex interface dynamics have observed during macroscopically flow, including intermittent pathway where pathways periodically disconnect and reconnect. physical mechanisms controlling this behaviour remained unclear, leading uncertainty concerning occurrence different regimes. We observe fraction is dependent on...
The injection of CO2 into subsurface reservoirs provides a long term solution for anthropogenic emissions. A variable rate (such as ramping the flow up or down) flexibility to sites, and could influence amount residual trapping. Observations made in cm-scale samples showed that starting at low established pathway across core, leading reduction pore space utilization, increases flux were accommodated with little change saturation. In this work we assess scalability these observations by...
Understanding multiphase flow through porous media is integral to geologic carbon storage or hydrogen storage. The current modelling framework assumes each fluid present in the subsurface flows its own continuously connected pathway. restriction caused by presence of another modelled using relative permeability functions. However, dynamic interfaces have been observed experimental data, and these are not accounted for In this work, we explore occurrence fluctuations context sizes, locations,...