大庆原油凝点温度附近屈服特性研究

为了研究停输后沿线管内原油的屈服应力分布,采用管输模拟的实验方法,研究了大庆原油在凝点温度附近的屈服特性.结果表明,大庆原油的屈服应力与动冷终温的关系曲线存在一拐点温度,此拐点温度为凝点以上2℃;当动冷终温一定时,原油的屈服应力与测量温度之间呈指数关系.通过对实验数据的综合分析,建立了屈服应力与动冷终温和测温的经验关系式,为铁大线管道停输后再启动过程的水力计算提供了基础数据.

Study on yielding behavior of the waxy crude of Daqing Oilfield near condensation point

The shut-off of the long distance pipeline for waxy crude oil often occurs.The gelling and yielding behaviors of waxy crude oil near condensation point temperature are the very important bases for evaluating the safety of the pipeline when the long distance pipeline shuts up.The yielding behavior of the waxy crude oil of Daqing Oilfield near condensation point is studied by simulation experiments.It is shown that there is a flex point on the relation curve between yield stress and end-cooling temperature,the flex point is 2 ℃ above gel temperature;when the end-cooling temperature is constant,there is a exponential relation between yield stress and measuring temperature.The empirical relational expressions between yield stress and end-cooling temperature and measuring temperature are established by the comprehensive analysis of the experimental data.This research provides basic data for the hydraulic calculation of Tieda pipeline in the restarting process after shut-off.