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Experimental Study of Improved Oil Recovery by Low-Salinity Waterflooding in Asphaltenic Reservoirs

Rashid, Saeed | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46228 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ayatollahi, Shahaboddin; Vosoughi, Manouchehr
  7. Abstract:
  8. There is increasing evidence that injecting modified brines has a significant impact on the amount of oil recovered, but the exact mechanism by which this occurs is an unsettled issue, and is supposed to be a cause of the complex interactions occurring between the phases insitu. In this thesis, surface chemistry of smart water has been investigated. Fluid/solid and fluid/fluid interactions for Bangestan crude oil in tfhe presence of designed solutions and a set of dilutions of Persian Gulf seawater have been studied and compared. Fluid/solid interactions were investigated through wettability studies. Impact of salinity and ionic composition on this interaction was measured through contact angle measurements and imbibition test. Fluid/fluid interactions were studied by interfacial tension measurements between crude oil and designed solutions using pendant drop method. Further, presence of sulfate reducing bacteria in crude oil and seawater was investigated.
    This study showed wettability alteration to be the major effect of smart water in Bangestan reservoir and a mechanism describing wettability alteration by smart water has been proposed. Contact angle measurements and imbibition tests showed salinity and brine composition to be of major importance for the observed trends. It was indicated that the properties of the oil–water interface are more or less dictated by the properties of the oil, like the acid number rather than smart water composition or salinity. Presence of Sulfate reducing bacteria in Bangestan crude oil and Persian Gulf seawater was denied during microbial study.
  9. Keywords:
  10. Enhanced Oil Recovery ; Carbonate Resrevoirs ; Wetting ; Interfacial Tension ; Sulfate Reduction Bacterias ; Smart Water

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