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China Surfactant Detergent & Cosmetics ›› 2024, Vol. 54 ›› Issue (12): 1405-1413.doi: 10.3969/j.issn.2097-2806.2024.12.001

• Basic research •     Next Articles

Performance of branched-chain extended surfactant mixed with zwitterionic or cationic surfactant

Xiaoding Zeng,Yancheng Zheng*(),Guoqing Zhang,Lingchi Zeng,Jian Mu   

  1. College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, Hubei 434023, China
  • Received:2024-08-02 Revised:2024-11-22 Online:2024-12-22 Published:2024-12-25
  • Contact: * E-mail: zhengycg@163.com.

Abstract:

2-Hexyl-1-decanol was used as the main material to prepare a block-polyether sulfonate extended surfactant (IC16P6E6S). The solubility and surface active properties of IC16P6E6S were evaluated, and then the IC16P6E6S was mixed with a cationic surfactant hexadecyl trimethyl ammonium bromide (CTAB) and a zwitterionic betaine surfactant (HAB), respectively. The effects of mixing ratios of IC16P6E6S∶HAB and IC16P6E6S∶CTAB on the hydrodynamic diameter and interfacial properties were discussed. The emulsification, adsorption and laboratory core displacement experiments of the binary system were tested. The results showed that the critical micelle concentration (cmc) of IC16P6E6S in distilled water was 0.1 mmol/L and the surface tension at cmc (γcmc) was 28.53 mN/m. IC16P6E6S showed strong synergistic effects with HAB and CTAB, and the mixed systems could effectively reduce the interfacial tension compared with single surfactants. The mixed systems with n (IC16P6E6S) ∶n (HAB) of 1∶1 and n (IC16P6E6S) ∶n(CTAB) of 1∶3 could maintain ultra-low interfacial tension (in the order of magnitude of 10-3 mN/m) in the salinity range of 1%-7% NaCl and low interfacial tension (in the order of magnitude of 10-2 mN/m) in the salinity range of 3%-7% NaCl, respectively. With the increase of salinity, the emulsion formed by the mixed surfactant system underwent the phase transition process from Winsor Ⅰ to Winsor Ⅲ and then to Winsor Ⅱ. The emulsion of mixed IC16P6E6S/HAB system had more middle-phase emulsion volume than that of the mixed IC16P6E6S/CTAB system, and the former emulsion system was more stable. The mixed IC16P6E6S/HAB system also had good solubilization effect, and the amount of oil solubilization was up to 43 mL/g. Meanwhile, it had good adsorption resistance. Compared with water flooding, the depressurization rate could reach 25.00% and the recovery could be enhanced by 11.75%, indicating that the IC16P6E6S/HAB system was more conducive to the depressurization and injection enhancement for low-permeability reservoirs.

Key words: extended surfactant, interfacial tension, adsorption property, dynamic light scattering, depressurization and enhanced injection

CLC Number: 

  • TQ423