关键词: 大庆原油, 蜡沉积, 输油管道, 蜡沉积速率, 数学模型

Abstract: A wax deposition model of Daqing crude oil was developed on the basis of theoretical analysis and laboratory experiment.The effects of oil temperature,flow velocity and temperature gradient of pipeline wall on wax deposition of Daqing oil were studied.When the temperature difference between crude oil and wall of pipeline is same,the wax deposition rate is different.There is wax deposition peak along a pipeline.At the same temperature of pipeline wall,the wax deposition rate increases with increase of oil temperature.At the same oil and wall temperature,the wax deposition rate increases with increase of flow velocity.The wax deposition model was used to predict wax deposition profile along Tieling-Qinhuangdao pipeline at different seasons.The results show that there is an area where wax deposition rate is serious between pump stations in winter.In autumn and spring,the wax deposition rate is the highest in outlets of pump stations.In summer,the variation of wax deposition rate is little along the Tieling-Qinhuangdao pipeline.

Key words: Daqing crude oil, wax deposition, oil transportation pipeline, wax deposition rate, mathematical model