Experimental investigation of foam-assisted N2 huff-n-puff enhanced oil recovery in fractured shale cores

Xiaofei Xiong, J. J. Sheng, Xiaofeng Wu, Jianghua Qin

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Gas huff-n-puff is an effective method of improving recovery factor from shale reservoirs. However, due to the existence of fractures in shale reservoirs, the gas easily flows along the fractures, and the efficiency of enhancing the oil recovery factor is low. In this paper, the foam-assisted N2 huff-n-puff experiment and the N2 huff-n-puff experiment are carried out in fractured shale cores. Compared with the N2 huff-n-puff experiment, the foam-assisted experiment inhibited the gas channeling of fractured cores, prolonged the gas channeling time, and expanded the N2 swept area. At the same time, the foam also has the advantage of viscosity and changing the interfacial tension due to the presence of surfactants, all of which help to improve the oil recovery. From the perspective of microscopic pores, foam-assisted N2 huff-n-puff not only produced oil in macropores, but also produced a small amount of oil in micropores and mesopores. The oil production in the macropores and mesopores contributes the most to the recovery factor. The cumulative recovery factor increased as the cycle number increased.

Original languageEnglish
Article number122597
JournalFuel
Volume311
DOIs
StatePublished - Mar 1 2022

Keywords

  • Enhanced oil recovery
  • Foam-assisted N huff-n-puff
  • Gas channeling
  • Shale oil

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