Characterization and identification of the most appropriate nonionic surfactant for enhanced oil recovery

Shilpi Sarmah, Subrata Borgohain Gogoi, Xianfeng Fan, Annanya A. Baruah

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The paper focuses on the behaviour of nonionic surfactants (NISs) for enhanced oil recovery (EOR) processes with special
reference to its applicability in the reservoirs of Upper Assam. The present work specifically studies three NISs, viz. Tergitol
15-s-7(Tg7), Tergitol 15-s-9 (Tg9) and Triton X 405(TX), based on their surface tension (ST), dynamic interfacial tension,
hydrophilic–lipophilic balance, emulsion stability, aqueous stability, particle size analysis and phase behaviour. Simultaneously,
crude oil from an oil field of upper Assam Basin was characterized based on API gravity, kinematic and dynamic
viscosities, pour point and acid number. Core flood studies were conducted in the reservoir core to determine the recovery
of crude oil during secondary water flood and EOR by NISs. It was observed that Tergitol 15-S-7 when mixed with Triton
X-405 (Tg7TX) had the least interfacial tension (IFT) as compared to individual NIS and their mixtures. The recovery was
found to be as high as 25.67% after secondary water flood from the original oil in place when Tg7TX followed by chase water
was used as an exotic fluid for EOR. This work is an attempt to identify NISs mixtures for EOR for Upper Assam Basin.
Original languageEnglish
Pages (from-to)pages115–123
JournalJournal of Petroleum Exploration and Production Technology
Publication statusPublished - 17 May 2019

Keywords / Materials (for Non-textual outputs)

  • Enhanced oil recovery
  • Nonionic surfactant
  • Z-average diameter
  • Nano-sized particle


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