New type of pore-snap-off and displacement correlations in imbibition
- Author
- Kamaljit Singh, Tom Bultreys (UGent) , Ali Q. Raeini, Mosayeb Shams and Martin J. Blunt
- Organization
- Project
- Abstract
- Hypothesis Imbibition of a fluid into a porous material involves the invasion of a wetting fluid in the pore space through piston-like displacement, film and corner flow, snap-off and pore bypassing. These processes have been studied extensively in two-dimensional (2D) porous systems; however, their relevance to three-dimensional (3D) natural porous media is poorly understood. Here, we investigate these pore-scale processes in a natural rock sample using time-resolved 3D (i.e., four-dimensional or 4D) X-ray imaging. Experiments We performed a capillary-controlled drainage-imbibition experiment on an initially brine-saturated carbonate rock sample. The sample was imaged continuously during imbibition using 4D X-ray imaging to visualize and analyze fluid displacement and snap-off processes at the pore-scale. Findings We discover a new type of snap-off that occurs in pores, resulting in the entrapment of a small portion of the non-wetting phase in pore corners. This contrasts with previously-observed snap-off in throats which traps the non-wetting phase in pore centers. We relate the new type of pore-snap-off to the pinning of fluid–fluid interfaces at rough surfaces, creating contact angles close to 90°. Subsequently, we provide correlations for displacement events as a function of pore-throat geometry. Our findings indicate that having a small throat does not necessarily favor snap-off: the key criterion is the throat radius in relation to the pore radius involved in a displacement event, captured by the aspect ratio.
- Keywords
- Colloid and Surface Chemistry, Surfaces, Coatings and Films, Biomaterials, Electronic, Optical and Magnetic Materials, Imbibition, snap-off, pore-filling, multiphase flow, porous media, 4D X-ray imaging, MULTIPHASE FLOW, 2-PHASE FLOW, CARBON-DIOXIDE, CONTACT-ANGLE, POROUS-MEDIA, HAINES JUMPS, FLUID, WETTABILITY, MECHANISMS, HYSTERESIS
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Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-8728234
- MLA
- Singh, Kamaljit, et al. “New Type of Pore-Snap-off and Displacement Correlations in Imbibition.” JOURNAL OF COLLOID AND INTERFACE SCIENCE, vol. 609, 2022, pp. 384–92, doi:10.1016/j.jcis.2021.11.109.
- APA
- Singh, K., Bultreys, T., Raeini, A. Q., Shams, M., & Blunt, M. J. (2022). New type of pore-snap-off and displacement correlations in imbibition. JOURNAL OF COLLOID AND INTERFACE SCIENCE, 609, 384–392. https://doi.org/10.1016/j.jcis.2021.11.109
- Chicago author-date
- Singh, Kamaljit, Tom Bultreys, Ali Q. Raeini, Mosayeb Shams, and Martin J. Blunt. 2022. “New Type of Pore-Snap-off and Displacement Correlations in Imbibition.” JOURNAL OF COLLOID AND INTERFACE SCIENCE 609: 384–92. https://doi.org/10.1016/j.jcis.2021.11.109.
- Chicago author-date (all authors)
- Singh, Kamaljit, Tom Bultreys, Ali Q. Raeini, Mosayeb Shams, and Martin J. Blunt. 2022. “New Type of Pore-Snap-off and Displacement Correlations in Imbibition.” JOURNAL OF COLLOID AND INTERFACE SCIENCE 609: 384–392. doi:10.1016/j.jcis.2021.11.109.
- Vancouver
- 1.Singh K, Bultreys T, Raeini AQ, Shams M, Blunt MJ. New type of pore-snap-off and displacement correlations in imbibition. JOURNAL OF COLLOID AND INTERFACE SCIENCE. 2022;609:384–92.
- IEEE
- [1]K. Singh, T. Bultreys, A. Q. Raeini, M. Shams, and M. J. Blunt, “New type of pore-snap-off and displacement correlations in imbibition,” JOURNAL OF COLLOID AND INTERFACE SCIENCE, vol. 609, pp. 384–392, 2022.
@article{8728234,
abstract = {{Hypothesis
Imbibition of a fluid into a porous material involves the invasion of a wetting fluid in the pore space through piston-like displacement, film and corner flow, snap-off and pore bypassing. These processes have been studied extensively in two-dimensional (2D) porous systems; however, their relevance to three-dimensional (3D) natural porous media is poorly understood. Here, we investigate these pore-scale processes in a natural rock sample using time-resolved 3D (i.e., four-dimensional or 4D) X-ray imaging.
Experiments
We performed a capillary-controlled drainage-imbibition experiment on an initially brine-saturated carbonate rock sample. The sample was imaged continuously during imbibition using 4D X-ray imaging to visualize and analyze fluid displacement and snap-off processes at the pore-scale.
Findings
We discover a new type of snap-off that occurs in pores, resulting in the entrapment of a small portion of the non-wetting phase in pore corners. This contrasts with previously-observed snap-off in throats which traps the non-wetting phase in pore centers. We relate the new type of pore-snap-off to the pinning of fluid–fluid interfaces at rough surfaces, creating contact angles close to 90°. Subsequently, we provide correlations for displacement events as a function of pore-throat geometry. Our findings indicate that having a small throat does not necessarily favor snap-off: the key criterion is the throat radius in relation to the pore radius involved in a displacement event, captured by the aspect ratio.}},
author = {{Singh, Kamaljit and Bultreys, Tom and Raeini, Ali Q. and Shams, Mosayeb and Blunt, Martin J.}},
issn = {{0021-9797}},
journal = {{JOURNAL OF COLLOID AND INTERFACE SCIENCE}},
keywords = {{Colloid and Surface Chemistry,Surfaces,Coatings and Films,Biomaterials,Electronic,Optical and Magnetic Materials,Imbibition,snap-off,pore-filling,multiphase flow,porous media,4D X-ray imaging,MULTIPHASE FLOW,2-PHASE FLOW,CARBON-DIOXIDE,CONTACT-ANGLE,POROUS-MEDIA,HAINES JUMPS,FLUID,WETTABILITY,MECHANISMS,HYSTERESIS}},
language = {{eng}},
pages = {{384--392}},
title = {{New type of pore-snap-off and displacement correlations in imbibition}},
url = {{http://doi.org/10.1016/j.jcis.2021.11.109}},
volume = {{609}},
year = {{2022}},
}
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