Pore-scale displacement mechanisms as a source of hysteresis for two-phase flow in porous media Public Deposited

http://ir.library.oregonstate.edu/concern/articles/d217qv372

Access to this item has been restricted by repository administrators at the request of the publisher until September 30, 2016.

This is the publisher’s final pdf. The article is copyrighted by American Geophysical Union and published by John Wiley & Sons, Inc. It can be found at:  http://sites.agu.org/

Supporting Information is available online at:  http://onlinelibrary.wiley.com/doi/10.1002/2015WR018254/abstract

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • The macroscopic description of the hysteretic behavior of two-phase flow in porous media remains a challenge. It is not obvious how to represent the underlying pore-scale processes at the Darcy-scale in a consistent way. Darcy-scale thermodynamic models do not completely eliminate hysteresis and our findings indicate that the shape of displacement fronts is an additional source of hysteresis that has not been considered before. This is a shortcoming because effective process behavior such as trapping efficiency of CO₂ or oil production during water flooding are directly linked to pore-scale displacement mechanisms with very different front shape such as capillary fingering, flat frontal displacement, or cluster growth. Here we introduce fluid topology, expressed by the Euler characteristic of the nonwetting phase (χ[subscript]n), as a shape measure of displacement fronts. Using two high-quality data sets obtained by fast X-ray tomography, we show that χ[subscript]n is hysteretic between drainage and imbibition and characteristic for the underlying displacement pattern. In a more physical sense, the Euler characteristic can be interpreted as a parameter describing local fluid connectedness. It may provide the closing link between a topological characterization and macroscopic formulations of two-phase immiscible displacement in porous rock. Since fast X-ray tomography is currently becoming a mature technique, we expect a significant growth in high-quality data sets of real time fluid displacement processes in the future. The novel measures of fluid topology presented here have the potential to become standard metrics needed to fully explore them.
Resource Type
DOI
Date Available
Date Issued
Citation
  • Schlüter, S., Berg, S., Rücker, M., Armstrong, R. T., Vogel, H. J., Hilfer, R., & Wildenschild, D. (2016). Pore‐scale displacement mechanisms as a source of hysteresis for two‐phase flow in porous media. Water Resources Research, 52(3), 2194-2205. doi:10.1002/2015WR018254
Series
Keyword
Rights Statement
Funding Statement (additional comments about funding)
Publisher
Peer Reviewed
Language
Replaces

Relationships

In Administrative Set:
Last modified: 10/27/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items