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China Surfactant Detergent & Cosmetics ›› 2020, Vol. 50 ›› Issue (10): 653-659.doi: 10.3969/j.issn.1001-1803.2020.10.001

• Basic research •     Next Articles

Rheological properties of a novel clean fracturing fluid: the micellar system of 25-HP-21/NaSal

CUI Xiu(),FANG Bo(),XU Hai-tao   

  1. Laboratory of Chemical Engineering Rheology, East China University of Science and Technology, Shanghai 200237, China
  • Received:2019-12-31 Revised:2020-09-10 Online:2020-10-22 Published:2020-10-22
  • Contact: Bo FANG E-mail:XIUCUI_JDOI@163.com;fangbo@ecust.edu.cn

Abstract:

Erucamidopropyl dimethylamine, oleamidopropyl dimethylamine and epichlorohydrin were used as the main raw materials to synthesize a novel asymmetric cationic Gemini surfactant, i.e. hydroxypropylene(erucamido-oleamido propyl dimethyl ammonium) chloride acetate (25-HP-21). Then 25-HP-21 was mixed with sodium salicylate (NaSal) to obtain a viscoelastic micellar system. The rheological properties, microrheological properties, temperature-resistance and sand-carrying properties of the micellar system were studied. The effects of NaSal on the aggregate morphology of 25-HP-21 micelles was characterized by1H NMR. The results showed that, when the content of 25-HP-21 in the mixed system was fixed to 2%, the optimized ratio of 25-HP-21/NaSal for this micellar system was 5∶1 (w/w). In addition, when the mass ratio of 25-HP-21/NaSal was fixed to 5∶1, the micellar system of 3.6% 25-HP-21/NaSal showed better viscoelasticity, temperature-resistance and sand-carrying properties and more significant shear thinning and thixotropy. The1H NMR spectrum of the system showed that the addition of NaSal was beneficial to the formation of worm-like micelles, and the arrangement of surfactant molecules were more compact. This micellar system had a simple formula and excellent properties, which was expected to enrich the family of novel clean fracturing fluids.

Key words: Gemini surfactant, clean fracturing fluid, micellar system, rheological property, microrheological property

CLC Number: 

  • TQ423