The Effect Of Magnetic Field On Viscosity And Wax Deposition Of Waxy Crude Oil

China abounds in waxy oil,When the crude oil temperature is reduced,the viscosity of the oil will rise and with the wax deposition,magnetic treatment technology is a physical treatment technology.In order to study on the influence of magnetic field on the oil rheological properties,viscosity of Daqing crude oil and Nanyang crude oil was measured and the change of viscosity reduction rate was analyzed before and after magnetic treatment.Two kinds of crude oil wax crystals and asphaltenes were observed,and the effects of magnetic field on micro particles was analyzed.The quality of wax deposition was measured and the effect of magnetic field on wax deposition rate was analyzed.Through the viscosity test,when the magnetic treatment condition changes,the viscosity reduction rate of Daqing crude oil and Nanyang crude oil will rise first and then decrease with the increase of test temperature,and the viscosity reduction effect in low temperature area is better than that in high temperature area.The viscosity of oil varies significantly with the magnetic treatment temperature,but smaller with the magnetic treatment time and magnetic field strength.The best magnetic treatment temperature of Daqing and Nanyang oil is higher than wax appearence point 3~6°C,the magnetic field intensity is 50 mT,and the magnetic treatment time is 20 min and 1min respectively.It showed magnetic field has certain viscosity reduction effect on oil.For studying viscosity reduction reason,carrying out the microscopic observation test,it found that the amount and total area of the wax crystals and asphaltene of both crude oil are reduced,and the average area of wax crystals become larger.It shows that magnetic field has inhibited the precipitation of wax and asphaltene,and also promoted the aggregation of these particles.Through the wax deposition test,it found that magnetic treatment of Daqing crude oil and Nanyang oil sediment quality and precipitation of wax quality are reduced,the maximum magnetic wax reduction rate of Daqing oil was 38.7%,the maximum magnetic wax reduction rate of Nanyang oil was 62.3%,the influence of magnetic field on Daqing crude oil was at least 18 h,the influence of Nanyang oil was above 18 h.The magnetic field inhibits the precipitation of wax and asphaltene,and accelerates the aggregation of wax and asphaltene particles,so as to achieve the effect of magnetic wax control and viscosity reduction.