Comparison test of factors affecting wax deposition of waxy crude oil

Abstract

In order to study the influence of different wax deposition factors on the wax deposition law of Daqing Crude Oil, the influence factors such as different wax deposition time, oil wall temperature difference, temperature range and shear rate were controlled with a single variable method, and the comparison test of wax deposition for Daqing Crude Oil was conducted with a new dynamic wax deposition testing apparatus. The results show that: In case the shear rate is constant, the amount of wax deposition will increase with the wax deposition time increase, while the wax deposition rate will decrease. In case the wall temperature of the wax deposition barrel is kept unchanged and lower than the wax appearance temperature, the amount of oil deposition will increase with temperature rising. In case the temperature difference between oil and pipe wall is maintained constant and the temperature range rises gradually, the amount of wax deposition will decrease. For shear stress is of nonlinear relationship with the amount of sheared and stripped wax, the wax deposition will be washed down by the oil flow when the shear force reaches a critical value. The research results could provide reference and technical support for pipeline transportation of waxy crude oil in future.

Keywords

• waxy crude oil
• wax deposition
• influence factors
• temperature
• shear rate
• wax deposition time