大庆原油蜡沉积规律研究

Study on wax deposition of Daqing crude oil

在理论分析及室内试验的基础上,系统研究了油温、流速、管壁处温度梯度等参数对大庆原油蜡沉积的影响。在原油与管壁温差相同时,不同温度段蜡沉积速率并不相同,存在蜡沉积高峰区。在壁温相同时,随油温升高,蜡沉积速率逐渐增加。在油温、壁温相同的条件下,随流速增加,蜡沉积速率下降。建立了大庆原油蜡沉积模型,并利用该模型预测了铁岭—秦皇岛输油管线不同季节、不同时间沿线蜡沉积分布。铁—秦线冬季存在蜡沉积高峰区;春、秋季出站时蜡沉积最严重,下一站进站时蜡沉积最轻;夏季蜡沉积速率更小,且沿线变化不大。

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 oumo stations. In summer, the variation of wax deoosition rate is little along the Tieling-Qinhuangdao oioeline.