Applied Microbiology and Biotechnology

, Volume 97, Issue 13, pp 5979–5991 | Cite as

Core flooding tests to investigate the effects of IFT reduction and wettability alteration on oil recovery during MEOR process in an Iranian oil reservoir

  • Arash Rabiei
  • Milad Sharifinik
  • Ali Niazi
  • Abdolnabi Hashemi
  • Shahab Ayatollahi
Applied microbial and cell physiology

Abstract

Microbial enhanced oil recovery (MEOR) refers to the process of using bacterial activities for more oil recovery from oil reservoirs mainly by interfacial tension reduction and wettability alteration mechanisms. Investigating the impact of these two mechanisms on enhanced oil recovery during MEOR process is the main objective of this work. Different analytical methods such as oil spreading and surface activity measurements were utilized to screen the biosurfactant-producing bacteria isolated from the brine of a specific oil reservoir located in the southwest of Iran. The isolates identified by 16S rDNA and biochemical analysis as Enterobacter cloacae (Persian Type Culture Collection (PTCC) 1798) and Enterobacter hormaechei (PTCC 1799) produce 1.53 g/l of biosurfactant. The produced biosurfactant caused substantial surface tension reduction of the growth medium and interfacial tension reduction between oil and brine to 31 and 3.2 mN/m from the original value of 72 and 29 mN/m, respectively. A novel set of core flooding tests, including in situ and ex situ scenarios, was designed to explore the potential of the isolated consortium as an agent for MEOR process. Besides, the individual effects of wettability alteration and IFT reduction on oil recovery efficiency by this process were investigated. The results show that the wettability alteration of the reservoir rock toward neutrally wet condition in the course of the adsorption of bacteria cells and biofilm formation are the dominant mechanisms on the improvement of oil recovery efficiency.

Keywords

Microbial enhanced oil recovery (MEOR) Wettability alteration Amott test Core flooding tests Biosurfactant Interfacial tension 

Notes

Acknowledgments

The authors would like to thank the EOR Research Center and Biotechnology Institute of Shiraz University for providing the technical and financial support. Also, special thanks are due to Amin Ramezani and Farzaneh Aram for their technical help in this study.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Arash Rabiei
    • 1
  • Milad Sharifinik
    • 2
  • Ali Niazi
    • 3
  • Abdolnabi Hashemi
    • 1
  • Shahab Ayatollahi
    • 4
    • 5
    • 6
  1. 1.Department of Petroleum EngineeringPetroleum University of TechnologyAhwazIran
  2. 2.Department of Petroleum Engineering, Science and Research BranchIslamic Azad UniversityFarsIran
  3. 3.Institute of BiotechnologyShiraz UniversityShirazIran
  4. 4.Enhanced Oil Recovery Excellence Research CenterShiraz UniversityShirazIran
  5. 5.School of Chemical and Petroleum EngineeringShiraz UniversityShirazIran
  6. 6.Sharif University of TechnologyTehranIran

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