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Effects of Velocity and Permeability on Tracer Dispersion in Porous Media
- Source :
- Applied Sciences, Volume 11, Issue 10, Applied Sciences, Vol 11, Iss 4411, p 4411 (2021)
- Publication Year :
- 2021
- Publisher :
- Multidisciplinary Digital Publishing Institute, 2021.
-
Abstract
- During micro-scale tracer flow in porous media, the permeability and fluid velocity significantly affect the fluid dispersion properties of the media. However, the relationships between the dispersion coefficient, permeability, and fluid velocity in core samples are still not clearly understood. Two sets of experiments were designed to study the effects of tracer fluid flow velocity and porous medium permeability on the dispersion phenomenon in a core environment, using natural and sand-filled cores, respectively. From experimental data-fitting by a mathematical model, the relationship between the dispersion coefficient, flow velocity, and permeability was identified, allowing the analysis of the underlying mechanism behind this phenomenon. The results show that a higher volumetric flow rate and lower permeability cause a delay in the tracer breakthrough time and an increase in the dispersion coefficient. The core experimental results show that the dispersion coefficient is negatively correlated with the permeability and positively correlated with the superficial velocity. The corresponding regression equations indicate linear relations between the dispersion coefficient, core permeability, and fluid velocity, resulting from the micron scale of grain diameters in cores. The combination of high velocity and low permeability yields a large dispersion coefficient. The effects of latitudinal dispersion in porous media cannot be ignored in low-permeability cores or formations. These findings can help to improve the understanding of tracer flow in porous media, the design of injection parameters, and the interpretation of tracer concentration distribution in inter-well tracer tests.
- Subjects :
- Technology
Materials science
010504 meteorology & atmospheric sciences
QH301-705.5
QC1-999
core permeability
02 engineering and technology
01 natural sciences
Physics::Geophysics
Physics::Fluid Dynamics
porous media
020401 chemical engineering
TRACER
fluid velocity
Dispersion (optics)
Fluid dynamics
General Materials Science
0204 chemical engineering
Biology (General)
Instrumentation
QD1-999
0105 earth and related environmental sciences
Fluid Flow and Transfer Processes
Superficial velocity
Process Chemistry and Technology
Physics
General Engineering
tracer concentration
Mechanics
Engineering (General). Civil engineering (General)
Computer Science Applications
Volumetric flow rate
tracer dispersion
Permeability (earth sciences)
Chemistry
Flow velocity
TA1-2040
Porous medium
Subjects
Details
- Language :
- English
- ISSN :
- 20763417
- Database :
- OpenAIRE
- Journal :
- Applied Sciences
- Accession number :
- edsair.doi.dedup.....11d7d3551199f77efaa2c3e79f6e3ff0
- Full Text :
- https://doi.org/10.3390/app11104411