• Open Access

Interfacial velocities and capillary pressure gradients during Haines jumps

Ryan T. Armstrong and Steffen Berg
Phys. Rev. E 88, 043010 – Published 22 October 2013

Abstract

Drainage is typically understood as a process where the pore space is invaded by a nonwetting phase pore-by-pore, the controlling parameters of which are represented by capillary number and mobility ratio. However, what is less understood and where experimental data are lacking is direct knowledge of the dynamics of pore drainage and the associated intrinsic time scales since the rate dependencies often observed with displacement processes are potentially dependent on these time scales. Herein, we study pore drainage events with a high speed camera in a micromodel system and analyze the dependency of interfacial velocity on bulk flow rate and spatial fluid configurations. We find that pore drainage events are cooperative, meaning that capillary pressure differences which extend over multiple pores directly affect fluid topology and menisci dynamics. Results suggest that not only viscous forces but also capillarity acts in a nonlocal way. Lastly, the existence of a pore morphological parameter where pore drainage transitions from capillary to inertial and/or viscous dominated is discussed followed by a discussion on capillary dispersion and time scale dependencies. We show that the displacement front is disperse when volumetric flow rate is less than the intrinsic time scale for a pore drainage event and becomes sharp when the flow rate is greater than the intrinsic time scale (i.e., overruns the pore drainage event), which clearly shows how pore-scale parameters influence macroscale flow behavior.

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  • Received 5 June 2013

DOI:https://doi.org/10.1103/PhysRevE.88.043010

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

©2013 American Physical Society

Authors & Affiliations

Ryan T. Armstrong* and Steffen Berg

  • Shell Global Solutions International BV, Kesslerpark 1, 2288 GS Rijswijk, The Netherlands

  • *Ryan.Armstrong@shell.com

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Vol. 88, Iss. 4 — October 2013

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