Based on the outstanding organic compatibility and the micro spherical morphology of polymethylsilsesquioxane (PMSQ) microspheres

BEM/PMSQ hybrid pour point depressant was prepared by melt blending method. Then

the effect of BEM/PMSQ hybrid pour point depressant on the pour point

viscoelasticity

viscosity and yield value of Qinghai waxy crude oil was evaluated by rheological experiment and the morphology of wax crystals was observed by the polarizing microscope. The results showed that the pour point of the undoped crude oil was 27.0℃; compared with the same dosage of the neat BEM (100 μg·g-1)

BEM/PMSQ 2% hybrid pour point depressant has the best performance

which can further reduce the pour point of 6.0℃

the gelation point of 4.3℃

the apparent viscosity of 39.0% and G' of 62.0%. The dispersion state of PMSQ microspheres and BEM/PMSQ hybrid pour point depressant in the dodecane showed that BEM were adsorbed on the surface of PMSQ microspheres

and acted as the wax crystal nucleation templates in the crude oil

thus resulting in the formation of the compact wax crystal structure and coating with less liquid oil

so as to improve the rheology of crude oil.