Abstract
Novel comb-shaped trimeric nonionic surfactant was synthesized with diethylenetriamine and organic acids, and then the chemical structure of the trimeric nonionic surfactant was characterized by Fourier transform infrared (FTIR) and elemental analysis. The interfacial film strength and critical micelle concentration (CMC) were measured by interface tension method. The emulsification properties was obtained by emulsification rate experiment and low field nuclear magnetic analysis, and the thermal stability of emulsions were also obtained by microscopic analysis and low field nuclear magnetic analysis. And then the comb-shaped trimeric nonionic surfactant showed an excellent emulsification effect with 2.5wt% adding amount in oil based drilling fluid. The performance of drilling fluids with various emulsifier adding amounts were investigated by rheological measurements, thermal stability analysis and filtration experiment. These results shows that the comb-shaped trimeric nonionic surfactant as an emulsifier improved the application performance of oil based drilling fluids, it was also found that the results in our work maybe provided a new research ideas about structure-performance relationships for the new trimeric nonionic surfactant.
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