Emulsification properties of comb-shaped trimeric nonionic surfactant for high temperature drilling fluids based on water in oil

The emulsification properties of comb-shaped trimeric nonionic surfactant and the stability of emulsion droplet are obtained by low field nuclear magnetic analysis. Relaxation time peak area and relaxation time peak area ratio can be used to characterize the emulsification properties of surfactant, in addition, the relaxation time peak area and peak spacing can be used to characterize the stability of emulsion droplet.