Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (2): 160-166.doi: 10.3969/j.issn.1673-8926.2017.02.020

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Laboratory study on surfactant flooding system based on clean fracturing flowback fluid

ZHOU Wensheng1,2, WANG Kai1,2, LIU Chen1,2, PAN Yue1,2, SHEN Jian1,2, LIU Yifei3   

  1. 1. CNOOC Research Insitute, Beijing 100028, China;
    2. State Key Laboratory of Offshore Oil Exploitation, Beijing 100028, China;
    3. College of Petroleum Engineering, China University of Petroleum, Qingdao 257061, Shandong, China
  • Received:2016-07-09 Revised:2016-09-07 Online:2017-03-21 Published:2017-03-21

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Abstract: Aiming at the large volumes,great treatment difficulties,high treatment cost of fracturing flowback fluid,and its harmfulness for environmental safety,the effective mass fraction,adsorption behavior,interfacial tension behavior,wettability alteration,incremental oil recovery ability and the mechanism of surfactant flooding were studied in laboratory,and a method was established to realize the reutilization of clean fracturing flowback fluid in surfactant flooding. The results show that the effective mass fraction of clean fracturing flowback fluid is 0.3%. The oi/water interfacial tension could be lowered to 10-4 mN/m to 10-3 mN/m with the effective mass fraction ranging from 0.05% to 0.30%. The clean fracturing flowback fluid system has excellent wettability performance and could easily change oil-wet quartz to water-wet. Meanwhile,the dynamic adsorption is about 9.53 mg/g and the dynamic retention amount is about 25%-33% of the dynamic adsorption. The physical model experiments show that the oil recovery value can be enhanced 12.5% under optimal injection project,which confirms its excellent performances on further enhanced oil recovery for the target area after fracturing treatment.

CLC Number: 

  • TE34
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