Displacement of Trapped Oil from Water-Wet Reservoir Rock

Dengen Zhou, Erling H. Stenby

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Displacement of oil trapped in water-wet reservoirs was analyzed using percolation theory. The critical capillary number of the CDC (Capillary Desaturation Curve) was be predicted based on the pore structure of the medium. The mobilization and stability theories proposed by Stegemeier were used to correlate oil cluster length to the capillary number needed to mobilize the trapped oil. Under the assumption that all pore chambers have the same size, a procedure was developed using the drainage capillary pressure curve and effective accessibility function to predict the CDC curve for a given medium. The prediction of critical capillary numbers was compared with the experimental data from 32 sandstone samples by Chatzis and Morrow. Also, the CDC curve of one sandstone sample was calculated using the procedure developed in this work and compared with the measured data. Very good agreements were obtained.
Original languageEnglish
JournalTransport in Porous Media
Volume11
Issue number1
Pages (from-to)1-16
Number of pages16
ISSN0169-3913
DOIs
Publication statusPublished - 1993

Keywords

  • Trapped oil
  • Invasion percolation
  • Capillary pressure
  • Accessibility
  • Capillary desaturation
  • Capillary number
  • Water-wet resevoir

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