低输量输油管道的清蜡周期研究

由于东北管网输量逐年下降,管道的热损失,尤其是清蜡结束后一段时间内的热损失相当严重,这已成为管道运行中的一个突出问题。按原有的清蜡工艺对管道进行清蜡已经不能满足管道运行的经济性要求。根据结蜡厚度对输油成本的影响和东北管网的蜡沉积规律,建立了适合低输量含蜡原油管道的清蜡周期模型。提出对于低输量含蜡原油管道需要先确定给定流量下的经济余蜡厚度,再用传统方法计算清蜡周期。用数值方法对模型进行求解。结果表明,对于低输量含蜡原油管道,每次清蜡时保留一定的余蜡厚度是合理的;与传统方法相比,在经济余蜡厚度基础上确定的清蜡周期能更好地满足实际需要。

Pigging Period Study for Oil Pipeline With Low Through- put

Because the throughput of Northeast China pipeline networks is becoming lower, heat loss of pipelines is severe, especially just after paraffin removal. This is a serious problem in pipeline operation. The indigenous paraffin removal process can't meet economical need. According to the effect of wax deposition thickness on oil transportation cost and the paraffin deposit law of Northeast China pipeline networks, a pigging period model was established to meet with the low throughput pipeline that transports waxy crude oil. It was presented, for the low throughput pipeline, that the optimal residuary paraffin deposit thickness should be determined first, then the pigging period calculated by the conventional means. The model can be solved by some numerical techniques. The results show that for a waxy crude oil pipeline with low through-put, retaining some residuary paraffin deposit thickness after each paraffin removal is reasonable; compared to the conventional means, the pigging period based on optimal residuary paraffin deposit thickness can meet the practice well.