The additive transport technology of crude oil is widely used in pipeline transportation,and the mechanism of the effect of additives on wax deposition in crude oil pipeline is very complicated.The effects of nano-viscosity reducers on wax deposition characteristics of waxy crude oil under different experimental conditions were studied by using a self-cooling finger device.DHR rheometer and differential scanning calorimeter were used to analyze the effects of nano-viscosity reducers on the rheological and depositional properties of waxy crude oil.The results showed that adding nano-viscosity reducers to waxy crude oil could effectively reduce the apparent viscosity,gel temperature and freezing point of waxy crude oil,and enhance the fluidity of waxy crude oil.The addition of nano-viscosity reducers could inhibit the formation of waxy crude oil deposits and reduce the rate of wax deposition,but cause the texture of wax deposits to harden.In addition,with the increase of nano-viscosity reducers,the wax extraction point of wax deposits increased and the wax content increased.
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