A pore-scale study of flow and transport across the sediment–water interface: From dispersive to turbulent regimes

2021 ◽  
Vol 33 (12) ◽  
pp. 126601
Author(s):  
Yilin Chen ◽  
Guangqiu Jin ◽  
Pei Zhang ◽  
Qihao Jiang ◽  
Silin Wu ◽  
...  
Keyword(s):  
Water Interface ◽  
Pore Scale ◽  
Flow And Transport

scholarly journals Pore-scale statistics of flow and transport through porous media

2018 ◽  
Vol 98 (1) ◽  
Author(s):  
Soroush Aramideh ◽  
Pavlos P. Vlachos ◽  
Arezoo M. Ardekani
Keyword(s):  
Porous Media ◽  
Pore Scale ◽  
Flow And Transport

COUPLING MULTIPHASE PORE-SCALE MODELS TO ACCOUNT FOR BOUNDARY CONDITIONS: APPLICATION TO 2D QUASI-STATIC PORE NETWORKS

2011 ◽  
Vol 03 (03) ◽  
pp. 109-131 ◽  
Author(s):  
ROBERT THOMAS PETERSEN ◽  
MATTHEW THOMAS BALHOFF ◽  
STEVEN BRYANT
Keyword(s):  
Boundary Conditions ◽  
Flow Behavior ◽  
Network Modeling ◽  
Network Models ◽  
Coupling Scheme ◽  
Pore Scale ◽  
Nuclear Waste Storage ◽  
Flow And Transport ◽  
Transport Behavior ◽  
Macroscopic Properties

Accurate predictions of macroscopic multiphase flow properties (relative permeability and capillary pressure) are necessary for modeling flow and transport in subsurface applications, such as hydrocarbon recovery, carbon sequestration and nuclear waste storage. These properties are usually measured experimentally, but pore-scale network modeling has become an efficient alternative for understanding fundamental flow behavior and predicting macroscopic properties. In many cases, network modeling gives excellent agreement with experiment by using models physically representative of real media. Void space within a rock sample can be extracted from high resolution images and converted to a topologically equivalent network of pores and throats. Multiphase fluid transport is then modeled in the network and macroscopic properties extracted from the model. Advancements continue to be made in making multiphase network models (both quasistatic and dynamic) predictive, but one limitation is that arbitrary (e.g., constant pressure) boundary conditions are usually assumed; they do not reflect the local saturations and pressure distributions that are affected by flow and transport in the surrounding media. In this work we demonstrate that transport behavior at the pore scale, and therefore, upscaled macroscopic properties are directly affected by the boundary conditions. Pore-scale drainage in 2D quasi-static networks is modeled by direct coupling to other pore-network models so that the boundary conditions reflect local variations of transport behavior in the surrounding media. Phase saturations are coupled at model boundaries to ensure continuity between adjacent models. Macroscopic petrophysical properties are shown to be largely dependent upon the surrounding media, which are manifested in the form of boundary conditions. The predictive ability of network simulations is thus improved using the novel network coupling scheme.

scholarly journals NUMERICAL SIMULATING THE CHEMICAL INTERACTION OF FLUID WITH ROCK AT THE PORE SCALE

2021 ◽  
Vol 2 (3) ◽  
pp. 46-54
Author(s):  
Tatyana S. Khachkova ◽  
Vadim V. Lisitsa
Keyword(s):  
Porous Medium ◽  
Fluid Flow ◽  
Reactive Transport ◽  
Chemical Interaction ◽  
Pore Space ◽  
Heterogeneous Reactions ◽  
Pore Scale ◽  
Active Components ◽  
Flow And Transport ◽  
The Finite Difference Method

The article presents a numerical algorithm for modeling the chemically reactive transport in a porous medium at a pore scale. The aim of the study is to research the change in the geometry of the pore space during the chemical interaction of the fluid with the rock. First, fluid flow and transport of chemically active components are simulated in the pore space. Heterogeneous reactions are then used to calculate their interactions with the rock. After that, the change in the interface between the liquid and the solid is determined using the level-set method, which allows to handle changes in the topology of the pore space. The algorithm is based on the finite-difference method and is implemented on the GP-GPU.

scholarly journals Pore-Scale Modeling of Multiphase Flow and Transport: Achievements and Perspectives

2012 ◽  
Vol 94 (2) ◽  
pp. 461-464 ◽  
Author(s):  
V. Joekar-Niasar ◽  
M. I. J. van Dijke ◽  
S. M. Hassanizadeh
Keyword(s):  
Multiphase Flow ◽  
Pore Scale ◽  
Flow And Transport ◽  
Scale Modeling ◽  
Pore Scale Modeling

3-D Microscopic Measurement and Analysis of Chemical Flow and Transport in Porous Media

1996 ◽  
Vol 118 (3) ◽  
pp. 470-480 ◽  
Author(s):  
Mehdi Rashidi ◽  
Andrew Tompson ◽  
Tom Kulp ◽  
Loni Peurrung
Keyword(s):  
Porous Medium ◽  
Three Dimensional ◽  
Pore Geometry ◽  
Pore Scale ◽  
Volume Data ◽  
Geometric Flow ◽  
Particle Volume ◽  
Flow And Transport ◽  
Solute Fluxes ◽  
Microscopic Measurement

Chemical flow and transport have been studied at the pore-scale in an experimental porous medium. Measurements have been taken using a novel nonintrusive fluorescence imaging technique. The experimental setup consists of a cylindrical column carved out of a clear plastic block, packed with clear beads of the same material. A refractive index-matched fluid was pumped under laminar, slow-flow conditions through the column. The fluid was seeded with tracer particles or a solute organic dye for flow and chemical transport measurements, respectively. The system is automated to image through the porous medium for collecting microscopic values of velocity, concentration, and pore geometry at high-accuracy and high-resolution. Various geometric, flow, and transport quantities have been obtained in a full three-dimensional volume within the porous medium. These include microscopic (pore-scale) medium geometry, velocity and concentration fields, dispersive solute fluxes, and reasonable estimates of a representative elementary volume (REV) for the porous medium. The results indicate that the range of allowable REV sizes, as measured from averaged velocity, concentration, and pore volume data, varies among the different quantities, however, a common overlapping range, valid for all quantities, can be determined. For our system, this common REV has been estimated to be about two orders of magnitude larger than the medium’s particle volume. Furthermore, correlation results show an increase in correlation of mean-removed velocity and concentration values near the concentration front in our experiments. These results have been confirmed via 3-D plots of concentration, velocity, pore geometry, and microscopic flux distributions in these regions.

Hysteresis in the electrical resistivity of partially saturated sandstones

Geophysics ◽  
1991 ◽  
Vol 56 (12) ◽  
pp. 2139-2147 ◽  
Author(s):  
Rosemary Knight
Keyword(s):  
Electrical Resistivity ◽  
Unsaturated Zone ◽  
Geophysical Data ◽  
Fluid Distribution ◽  
Water Interface ◽  
Pore Scale ◽  
Laboratory Measurements ◽  
Partially Saturated ◽  
Air Water Interface ◽  
Saturation History

Laboratory measurements of the resistivity of three sandstone samples collected during imbibition (increasing Sw) and drainage (decreasing Sw) show pronounced hysteresis in resistivity throughout much of the saturation range. The variation in resistivity can be related to changes in pore‐scale fluid distribution caused by changes in saturation history. The form of the hysteresis is such that resistivity measured during imbibition is consistently less than that measured, at the same saturation, during drainage. This can be attributed to the presence of conduction at the air/water interface in partially saturated samples; an effect that is enhanced by fluid geometries associated with the imbibition process. The results of this study suggest that the dependence of geophysical data on saturation history should be considered when interpreting data from the unsaturated zone.

scholarly journals Understanding hydraulic fracturing: a multi-scale problem

2016 ◽  
Vol 374 (2078) ◽  
pp. 20150426 ◽  
Author(s):  
J. D. Hyman ◽  
J. Jiménez-Martínez ◽  
H. S. Viswanathan ◽  
J. W. Carey ◽  
M. L. Porter ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Multiple Scales ◽  
Element Model ◽  
Fracture Network ◽  
Working Fluid ◽  
Pore Scale ◽  
Network Modelling ◽  
Flow And Transport ◽  
Fractured Well ◽  
The Impact

Despite the impact that hydraulic fracturing has had on the energy sector, the physical mechanisms that control its efficiency and environmental impacts remain poorly understood in part because the length scales involved range from nanometres to kilometres. We characterize flow and transport in shale formations across and between these scales using integrated computational, theoretical and experimental efforts/methods. At the field scale, we use discrete fracture network modelling to simulate production of a hydraulically fractured well from a fracture network that is based on the site characterization of a shale gas reservoir. At the core scale, we use triaxial fracture experiments and a finite-discrete element model to study dynamic fracture/crack propagation in low permeability shale. We use lattice Boltzmann pore-scale simulations and microfluidic experiments in both synthetic and shale rock micromodels to study pore-scale flow and transport phenomena, including multi-phase flow and fluids mixing. A mechanistic description and integration of these multiple scales is required for accurate predictions of production and the eventual optimization of hydrocarbon extraction from unconventional reservoirs. Finally, we discuss the potential of CO 2 as an alternative working fluid, both in fracturing and re-stimulating activities, beyond its environmental advantages. This article is part of the themed issue ‘Energy and the subsurface’.

Numerical Efficiency Assessment of IB–LB Method for 3D Pore-Scale Modeling of Flow and Transport

2015 ◽  
Vol 109 (1) ◽  
pp. 1-23 ◽  
Author(s):  
M. Benioug ◽  
F. Golfier ◽  
A.-J. Tinet ◽  
M. A. Buès ◽  
C. Oltéan
Keyword(s):  
Pore Scale ◽  
Numerical Efficiency ◽  
Flow And Transport ◽  
Scale Modeling ◽  
Efficiency Assessment ◽  
Pore Scale Modeling
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