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PLoS One. 2014 Nov 19;9(11):e113723. doi: 10.1371/journal.pone.0113723. eCollection 2014.

Study on the reutilization of clear fracturing flowback fluids in surfactant flooding with additives for Enhanced Oil Recovery (EOR).

Author information

1
China University of Petroleum (East China), Qingdao, Shandong, 266580, People's Republic of China.
2
China University of Petroleum (East China), Qingdao, Shandong, 266580, People's Republic of China; China National Offshore Oil Corporation Research Institute, Beijing, 100028, People's Republic of China.

Abstract

An investigation was conducted to study the reutilization of clear fracturing flowback fluids composed of viscoelastic surfactants (VES) with additives in surfactant flooding, making the process more efficient and cost-effective. The clear fracturing flowback fluids were used as surfactant flooding system with the addition of α-olefin sulfonate (AOS) for enhanced oil recovery (EOR). The interfacial activity, emulsification activity and oil recovery capability of the recycling system were studied. The interfacial tension (IFT) between recycling system and oil can be reduced by 2 orders of magnitude to 10(-3) mN/m, which satisfies the basic demand of surfactant flooding. The oil can be emulsified and dispersed more easily due to the synergetic effect of VES and AOS. The oil-wet surface of quartz can be easily converted to water-wet through adsorption of surfactants (VES/AOS) on the surface. Thirteen core plug flooding tests were conducted to investigate the effects of AOS concentrations, slug sizes and slug types of the recycling system on the incremental oil recovery. The investigations prove that reclaiming clear fracturing flowback fluids after fracturing operation and reuse it in surfactant flooding might have less impact on environment and be more economical.

PMID:
25409507
PMCID:
PMC4237460
DOI:
10.1371/journal.pone.0113723
[Indexed for MEDLINE]
Free PMC Article

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