Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (5): 1076.doi: 10.7503/cjcu20190670

• Physical Chemistry • Previous Articles     Next Articles

Enhancement of CO2 Foam Stability with Modified Silica Nanoparticles in High Salinity Brine

ZHANG Xuan,ZHANG Tianci,JIANG Ping,GE Jijiang,ZHANG Guicai()   

  1. College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China
  • Received:2019-12-14 Online:2020-05-10 Published:2020-02-24
  • Contact: Guicai ZHANG E-mail:zhanggc@upc.edu.cn
  • Supported by:
    † Supported by the National Key R&D Program of China(2018YFA0702400);the National Natural Science Foundation of China(51574266);the Fundamental Research Funds for the Central Universities of Ministry of Education of China(17CX06012)

Abstract:

The liquid phase stability and CO2 foam stability were studied with mixing cationic surfactant and modified nanoparticles(NPs) solutions. It was concluded that inorganic ions screened the electrostatic attraction force between the NPs and cationic surfactant. Moreover, the ratio of surfactant and NPs determined the solution stability in constant salinity brine. From the interfacial tension(IFT) measurement, when the surfactant concentration was higher than its critical micelle concentration, the IFT was similar before and after adding NPs and the lowest IFT was 6 mN/m, whereas it was not as the surfactant concentration was lower than CMC. The bulk foam stability results shown that the NPs enhanced the foam half-life with more than twice time. However, it depended on the concentration ratio. Furthermore, the apparent viscosity of foam stabilized with mixture was increased from 20 mPa·s to 55 mPa·s, nearly triple higher than that with only surfactant in sand-pack with total injection velocity 2 mL/min and foam quality 70%. In summary, adding NPs to surfactant solution, the foam flooding would be more efficient at specified conditions.

Key words: Modified nanoparticles, Surfactant, CO2 foam, Foam stability

CLC Number: 

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