Abstract: The wax content and freezing point of the high-pour-point-oil in Weibei Oilfield are high. When the temperature
is below the wax precipitation point，the high-pour-point-oil behaves as a non-newtonian fluid which is greatly affected by
shear. Thus，the shear viscosity and pour point reduction experiments of non-newtonian high-pour-point-oil were conducted.
The results show that under the shear function，the viscosity of non-newtonian high-pour-point-oil is reduced greatly；the nonnewtonian
high-pour-point-oil presents shear thinning and the lower the temperature is，the more obvious the shear thinning
is；the shearing rate has greater effect on the freezing point and freezing time of non-newtonian high-pour-point-oil；under the
shear function near freezing point，the freezing point can be reduced by 56 ℃ and the freezing time is obviously prolonged；
the shearing time has little impact on the freezing point and has greater influence in freezing time and when it shears about
20 min（the rotational speed is 100 r/min），the freezing time can be prolonged by 817 min.

Key words: non-Newtonian fluid, high-pour-point-oil, shear, freezing point, freezing time