Investigations on the Effect of Biosurfactants on the Wettability of Carbonate Rocks via Interactions with Rock and Fluid in Ex-Sito MEOR

Adelzadeh, Mohammad Reza | 2010

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 41782 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Roosta Azad, Reza; Kamali, Mohammad Reza; Shadizadeh, Reza
  7. Abstract:
  8. The effects of biosurfactants on sandstone rocks are known in the literature. However, there are few examples of experimental works in Iranian carbonate reservoirs dealing with the effects of biosurfactants under reservoir conditions. This thesis discusses the effect of an efficient biosurfactant produced from Pseudomonas aeroginosa MRo1, a bacterial strain isolated from oil excavation areas in southern Iran, on the recovery of residual oil trapped within carbonate rocks was investigated. The MRO1 could reduce surface tension from 72 to 28 dyne/cm. It also could reduce Interfacial tension from 18.382 to 5.646 dyne/cm.
    In a core holder set-up bearing four limestone- and dolomite-containing core samples from bibihakimeh, water flooding experiments demonstrated that the oil recovery efficiencies were about 50%. Biosurfactant injection in less permeable rocks in a range of 0.5 to 32 md was more successful in terms of oil production. The core holder biosurfactant flooding resulted in oil recoveries as large as 10% to 15% residual oil (RO). In the case of the least oil recovery via biosurfactant flooding, incubation of the core with a biosurfactant solution at reservoir conditions increased the recovery from 13% residual oil at zero resting time to 15% after a resting time of one week and to about 30% after a resting time of about two weeks. Based on interfacial tension measurements, salinity and to a larger extent biosurfactant reduced interfacial tension. When salinity increased from 170000 to 200000 ppm, the fraction of residual oil production increased to about 20%. In this work, the effects of wettability and the impacts of ambient and reservoir temperature on relative permeability curves were studied
  9. Keywords:
  10. Wetting ; Capillary Pressure ; Biosurfactant ; Oil Recovery

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