Waterflood Oil Recovery from Mixed-Wet Limestone: Dependence upon the Contact Angle

Magali Christensen, Yukie Tanino (Corresponding Author)

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)
7 Downloads (Pure)


Remaining oil saturation established by waterflooding from maximum initial oil saturation was measured in Indiana limestone under four mixed-wet conditions established using different organic acids. The altered wettability is characterized by the advancing contact angle of the aqueous phase on a calcite substrate submerged in the oil phase, which ranged from θo = 50° to 150°. Remaining oil saturation decayed as a power of time for up to 55 pore volumes of water injected and then reached a constant value. The duration of oil production increased linearly with θo. In contrast, remaining oil saturation decreased and then increased with increasing θo within the range of experimental conditions, with optimal wettability for recovery shifting from θo = 110° to 135° as waterflood progressed.
Original languageEnglish
Pages (from-to)1529-1535
Number of pages7
JournalEnergy & Fuels
Issue number2
Early online date3 Jan 2017
Publication statusPublished - 2017


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