Role of divalent ions, temperature, and crude oil during water injection into dolomitic carbonate oil reservoirs

Mohammad Fattahi Mehraban, Shahab Ayatollahi, Mohammad Sharifi

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)
2 Downloads (Pure)

Abstract

Although wettability alteration has been shown to be the main control mechanism of Low Salinity and Smart Water (LS-SmW) injection, understanding of the phenomena resulting in wettability changes still remains incomplete. Thus, direct measurement of wettability through contact angle measurement at ambient and elevated temperatures (28°C and 90°C) during LS-SmW injection to identify trends in wettability alteration was carried out. Zeta potential measurement was applied as an indirect technique for wettability assessment in rock/brine and oil/brine interfaces in order to validate the contact angle measurements. The results provided a new understanding to the effect of temperature and different ions on the wettability state of dolomite particles during an enhanced oil recovery process. Observations showed that increasing temperature from 28°C to 90°C reduced the contact angle of oil droplets from 140 to 41 degrees when Seawater (SW) was injected. Additionally, changing crude oil from crude-A (low asphaltene content) to crude-B (high asphaltene content) contributed to more negative surface charges at the oil/brine interface. The results suggested that the sulfate ion (SO2-4 ) was the most effective ion for altering dolomite surface properties, leading to less oil wetness. Wettability alteration at ambient and elevated temperatures during LS-SmW injection could be explained by Electrical Double Layer (EDL) theory.

Original languageEnglish
Article number36
JournalOil and Gas Science and Technology
Volume74
Early online date8 Apr 2019
DOIs
Publication statusPublished - 2019

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

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