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Microorganisms Effects on Interfacial Tension and Wettability During Smart Water Injection in Oil Reservoirs

Jahanbani Veshareh, Moein | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47567 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ayatollahi, Shahabodin; Massihi, Mohsen
  7. Abstract:
  8. This research was done for feasibility evaluation and understanding correct microbial enhanced oil recovery(MEOR) procedure for carbonate reservoirs. With the aim of cost reduction and possible activation of smart water mechanisms, sea water used as a base for MEOR process. Two biosurfactant producing strains were isolated from oil contaminated water and soil, and one halotolerant strain, from sea water. Optimization of biosurfactant yield was conducted and two new definitions for optimum point, by considering economical and technical facts, were proposed. Partial characterization of produced biosurfactant was carried out through FTIR and NMR analysis and the produced biosurfactant was characterized to be surfactin with minor differences.Then, the effect of sea water, live and dead cells of microorganisms on wettability was evaluated from contact angle measurements. The results show that, only gram negative bacteria can change the wettability of calcite to its original condition and dolomite to neutral wettability. Considering the results, for carbonate reservoirs just in situ MEOR may be successful by stimulation of gram negative indigenous microorganisms. Carbonate reservoirs are target of this research. However, the results could be used for sandstone reservoirs. By considering optimizations proposed in this work for sandstone reservoirs, regardless of the process type, in situ or ex situ, one could reduce operational cost along with preventing formation damage
  9. Keywords:
  10. Wettability ; Interfacial Tension ; Biosurfactant ; Microbial Enhanced Oil Recovery (MEOR) ; Smart Water ; Wetting

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