A Dynamic Two-Phase Pore-Scale Model of Imbibition

Kristian Mogensen, Erling Halfdan Stenby

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We present a dynamic pore-scale network model of imbibition, capable of calculating residual oil saturation for any given capillary number, viscosity ratio, contact angle, and aspect ratio. Our goal is not to predict the outcome of core floods, but rather to perform a sensitivity analysis of the above-mentioned parameters, except from the viscosity ratio. We find that contact angle, aspect ratio, and capillary number all have a significant influence on the competition between piston-lice advance, leading to high recovery, and snap-off, causing oil entrapment. Due to significant CPU-time requirements we did not incorporate long-range correlations among pore and throat sizes in our network, but were limited to small-range correlations. Consequently, the gradual suppression of snap-off occurs within one order of magnitude of the capillary number. At capillary numbers around 10(-8)-10(-7), snap-off has been entirely inhibited, in agreement with results obtained by Blunt (1997) who used a quasi-static model. For higher aspect ratios, the effect of rate and contact angle is more pronounced.
Original languageEnglish
JournalTransport in Porous Media
Volume32
Issue number3
Pages (from-to)299-327
ISSN0169-3913
DOIs
Publication statusPublished - 1998
Event18th IEA Workshop and Symposium on Enhanced Oil Recovery - Copenhagen, Denmark
Duration: 1 Sep 19973 Sep 1997

Workshop

Workshop18th IEA Workshop and Symposium on Enhanced Oil Recovery
CountryDenmark
CityCopenhagen
Period01/09/199703/09/1997

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