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ABSTRACT
A novel star-shaped sulfonate surfactant, synthesized with triethanolamine, was identified as a hydrophilic emulsifier which could form a stable water-in-oil emulsion. The interfacial film strength was measured by suspension drop method. The emulsification properties of emulsions were obtained by the emulsification rate experiment and demulsification voltage measurement. The emulsion shows an excellent emulsification effect when the addition of star-shaped anionic surfactant into oil-based drilling fluid was 2.0 wt%. In addition, the properties of surfactant in drilling fluid with different adding amounts were studied by rheological properties, thermal stability analysis and filtration experiments. The results show that star-shaped anionic surfactant used as emulsifier can improve the performance in oil-based drilling fluid, which maybe provides a new idea for this type of surfactant.
GRAPHICAL ABSTRACT
