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The ImproDeProF projectTwo-phase flow in porous media:Improvement of the Mechanistic Model DeProF and implementation in practical applications |
Research project seed-funded by the European Union (European Social Fund) and Greek national resources in the frameworks of the “Archimedes III: Funding of Research Groups in TEI of Athens” (MlS 379389), a RTD project of the “Education & Lifelong Learning” Operational Program
Summary
Two-phase flow in porous media (2ph pm) occupies a central position in physically important processes with practical applications in the energy and environmental sector industries.
To date, the characterization and modeling of multiphase flows in p.m. has delivered promising theoretical and experimental results over a hierarchy of scales (pore-to-production). Nevertheless, integration across those scales remains an outstanding problem. Likewise, technological progress has enabled laboratory studies to expose latent flow mechanisms; pore-scale phenomena and critical interstitial physical quantities can now be identified and assessed digitally, computationally, or experimentally. At the same time, pragmatic sustainability issues on energy production/management shifted “recovery increase” trends into “process efficiency optimization” scopes and targets. As a consequence, new challenges emerge within a wide spectrum of technological problems, extending from laboratory scales, e.g. design systematic protocols for regular/special core analysis (R/SCAL) for data collection/interpretation, to industrial scales, e.g. unconventional/ enhanced oil recovery (EOR) /carbon capture & sequestration (CCS), soil & aquifer pollution & remediation or operation of trickle-bed reactors.
Without neglecting the fact that the majority of industrial applications of two-phase flow in macroscopically heterogeneous porous media are based on inherently transient processes, to understand the physics of such processes in a deeper context, we need first to understand the stationary case, steady-state two-phase flow in p.m.
The DeProF model:
The scope of the ImproDeProF project is to further develop the DeProF model and to extend and improve the associated tentative theory to reveal the latent physics governing the sought process. The associated flow analysis takes into account:
(1) Disconnected flow - A complete, rigorous, and true-to-mechanism modeling of two-phase flow should incorporate the flow of disconnected non-wetting phase (NWP), a substantial and sometimes prevailing flow pattern. The flow of disconnected NWP is observed in artificial, stochastic, and virtual pore network models, as well as in real p.m. and extends over regimes spanning large and small NWP ganglion dynamics, to NPW droplet flow, to emulsion type flows.
(2) Independent variables – The conventional approach of saturation-dependent relative permeability cannot handle a specific-enough representation of the process phenomenology across the entire spectrum of flow conditions. The set of independent variables is reappraised, considering the inherent, flow rate dependencies of the process.
(3) Inherent degrees of freedom - The process itself is a complex hierarchical system, strongly affected by factors residing at several different length scales and/or occurring over widely different time scales. The correlated and cross-dependent behavior of individual small-scale components (e.g. interactions between the pore-scale geometry of the disconnected NWP and the connected WP) induces a dynamic system behavior at the next scale (e.g. core scale) and so on (e.g. formation scales). Ergodicity is nested within the physics of multiphase flows and is reflected in the incessant reconfiguration of interstitial flow structures even under steady-state flow conditions. Recent simulations suggest that inherent degrees of freedom depend strongly on the extent of the NWP disconnectedness.
Below you may find a list of recent publications produced within the framework of the ImproDeProF project, delineating the latest advances, indicative applications, and future challenges in the development of a tentative theory for two-phase flow in porous media, namely the DeProF theory.
News (updated Oct. 2021)
Grants! 2 complementary grants were awarded to M.S. Valavanides (UNIWA) for a 3-month research stay at the Institute of Applied Mechanics (MIB) / Univ. of Stuttgart to deploy the project "Laboratory validation of Flow-Dependent Relative Permeability Scaling for steady-state two-phase flow in micro-fluidic pore networks" in collaboration with Prof. H. Steeb and his group.
Sponsoring foundations:
(a) the German Academic Exchange Service (DAAD - 5752335 Research Stays for University Academics and Scientists, 2021) |
(b) the Society of Petrophysicists and Well Log Analysts (SPWLA 2021 Grants & Scholarship recipients) |
Formation of HINC the Hellenic InterPore National Chapter --> https://www.interpore.org/wp-content/uploads/2019/09/HINC-kick-off-meeting-and-one-day-conference.pdf https://www.interpore.org/interpore-national-chapter-events/
ImproDeProF Project results (updated Sep. 2024)
Working Papers & Theses
Journal Papers
Conference Proceedings
Conference extnd abstracts / posters
Other
Past Events
Minisymposium MS18: "Innovative Methods for Characterization, Monitoring, and In-Situ Remediation of Contaminated Soils and Aquifers", held Online-only within InterPore2020 Aug. 30 - Sep. 4, 2020, Co-organizers: C.D. Tsakiroglou (FORTH/ICE-HT), M.S. Valavanides (UniWA), O. Vizika (IFP-EN), Qi Li (Chinese Academy of Sciences)
The efficacy of methods used for the characterization, monitoring, and remediation of contaminated soils and aquifers is unavoidably associated with the multi-scale properties of unsaturated and saturated zones. The development of innovative, and cost-effective methods for (i) mapping and monitoring polluted soils and surface emissions from spread pollutants, and (ii) in situ soil and aquifer remediation rely on information resulting from lab-, pilot-, and field-scale tests along with process modeling and simulation in porous media. Toward this direction, earlier and new knowledge concerning the multiphase and multi-component transport and reactive processes in multi-scale porous media must be handled in the light of interdisciplinary approaches (e.g. geology, chemistry, chemical engineering, physics, etc.) for understanding, analyzing, and modeling the complex processes involved. For this mini-symposium, we invite experimental and theoretical contributions that focus on the development, application, and interpretation of innovative techniques for the characterization / monitoring / in situ remediation (e.g. biological treatment, thermal treatment, advanced oxidation, electro-remediation, nanoremediation, hybrid technologies, etc.) of soils and aquifers at a broad hierarchy of scales ranging from the pore- to the field-scale.
Minisymposium MS 1.12: "Simulation (Lab, Virtual) As a Source of New Knowledge", held within the 8th International Conference on Porous Media, May 9-12, Cincinnati, Ohio, USA, Co-organizers: M.S. Valavanides (TEI Athens), A. Hansen (NTNU), V.N. Burganos (FORTH/ICE-HT)
The mini-symposium focused on simulations within a virtual or real model domain under pre-selected or controlled conditions, in order to observe and retrieve data and measurable information within flow in porous media phenomena. The purpose is to grasp a representative image and give a better understanding of the physics of the process at the REV scale, provide insight into the pertinent mechanisms, and then integrate this knowledge (not just information) into sound theoretical inferences on the macroscopic description of the processes. Topics addressed: (a) Implementation of current simulation technologies into providing a better understanding of the phenomenology of multi-phase flow in porous medium (understanding by simulating), (b) Design of efficient experimental protocols that will bridge modeling with data interpretation and application into improved functional description and characterization of flow and porous media (synthesis), (c) Other ideas/approaches integrating simulation into new knowledge, for improving tentative theories on multi-phase flows in porous media.
Minisymposium MS 1.3: "Unconventional Modelling of Multi-Phase Flows in Porous Media", held in parallel to the 7th International Conference on Porous Media, May 18-21, Padova, Italy, Co-organizers: M.S. Valavanides (TEI Athens), M. A. Ioannidis (U. Waterloo), C.D. Tsakiroglou (FORTH/ICE-HT), O. Vizika (IFP-REN)
The mini-symposium focused on unconventional modeling of multi-phase flows, with special consideration on disconnected flow regimes, process’ inherent degrees of freedom, a reappraisal of true-to-mechanism independent variables, etc. New approaches integrating current knowledge into a unified theory for multi-phase flow in p.m. have been communicated and emerging research perspectives have been addressed.
Invitation
to join an international effort for Retrospective Examination of Relative Permeability Data (Dec. 2013)
Dear Colleagues and Fellow Researchers,
You are invited to join the ImproDeProF project team efforts in collecting laboratory-measured relative permeability data sets. As a follow-up of the ImproDeProF project, it is planned to establish a data base of relative permeability data sets, and to conduct a retrospective examination focusing on latent critical flow conditions for steady-state two-phase flow in porous media.
So far, the data base comprises a total of 179 relative permeability diagrams pertaining to laboratory runs collected from 35 published works (see [3] and [2] above).
If you have rel-perm data sets that you are willing to share or that could be used in this re-investigation, please contact Dr. Marios Valavanides (marval@uniwa.gr).
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