Daqing Crude Oil is a typical high gelling point,high viscosity and high wax crude,and its fluidity at low temperature is relatively bad.In order to improve its low temperature fluidity,composite nanometer-sized material is added into the crude.Based on XRD scanning experiment and POM photography,the impact of composite nanometer-sized material on crystal form of paraffine in waxy crude oil and wax precipitation point is studied.Dynamic temperature drop XRD scanning comparison testing on Daqing Crude Oil an...