苏丹3/7区海底装船原油管道的结蜡规律

Wax deposition law of seabed shipment crude oil pipeline in Sudan 3/7 Block

苏丹3/7区海底装船原油管道是一条原油装船与柴油替换交替进行的海底管道,针对其工艺特点,将试验与理论模型相结合,模拟装船期管道沿线结蜡厚度和温度的变化规律,以及无船期柴油替换过程中柴油流速与冲刷溶解蜡量之间的关系。结果表明:装船运行时间长,蜡层厚且单位时间内的结蜡量下降;柴油替换流速越大,对蜡层的冲刷溶解效果越好。综合考虑柴油替换过程中能量消耗和对蜡沉积层的冲刷效果,指出柴油替换的经济流速为2m/s。综合分析蜡沉积规律和蜡层的冲刷溶解规律,是进行类似运行工况管道结蜡规律研究的有效方法。

The seabed shipment crude oil pipeline in Sudan 3/7 Block is a submarine pipeline. The transportation process of the pipeline is alternately replaced by the crude oil shipment and diesel. According to the characteristics of transportation process,the experimental model and theoretical model are integrated to simulate the change laws of wax thickness and temperature along the pipeline in shipment period and the relationship between the dissolved amount of wax and the flowrate of diesel in the substitution process of diesel in non-shipment period. Results show that the longer the time of shiploading is,the thicker the layer of wax deposition is,and the amount of wax deposition per unit time is declined. The greater the displaced flowrate of diesel is,the better the dissolved effectiveness of wax layer is. Considering the energy consumption in the replacing process of diesel and the scouring effectiveness to the wax deposition layer synthetically,the economical replacing flowrate of diesel is 2 m/s. Analyzing the law of wax deposition and decomposition will be an effective way to study the law of wax deposition in the similar pipeline operating conditions.