仪长原油管道清管实践

仪长原油管道自2006年5月全线投产直至2012年9月从未进行过清管作业，为了从根本上改善管道的运行状况，先后进行两次清管作业。首次清管采用YY—RGQ型软体清管器，以降低清管风险，保证管道安全运行；第二次清管采用站场自配的安装有跟踪设备的YY—JDQ型清管器。阐述了清管作业过程，包括收发球操作和清管技术要求。清管结果表明：首次清管杂质较多，有加热炉运行的管段，结蜡量相对较少；第二次清管清除的蜡和杂质虽然明显少于首次清管，但蜡沉积已经对管道的经济运行产生了影响，说明清管周期不合理。为此建议：易结蜡管段采用加热输送工艺，使输油温度高于析蜡点；确定最佳清管周期，制定合理的清管计划。（图1，表1，参6）

Pigging practice in Yi-Chang Crude Oil Pipeline

Since Yi-Chang Crude Oil Pipeline put into production in May, 2006, the pigging for it had not been made until Sept. 2012. Then, in order to fundamentally improve the running condition of the pipeline, pigging was carried out twice. In the first pigging operation, YY-RGQ soft pig was used to decrease the risk of pigging and guarantee safe running. While in the second pigging operation, YY-JDQ pig with tracking equipment was used. This paper presents the pigging process including the operation of sending and receiving pigs and technical requirements of pigging. The result shows that in the first pigging, there were lots of impurities and less wax in the pipe section where heater was operating. In the second pigging, although the wax and impurities cleaned out were much less than that in the first time, the wax deposition had already affected the economical running of the pipeline, which indicates that the pigging interval is unreasonable. Therefore, it is suggested that heating transportation should be applied in the wax prone pipeline section to guarantee that the oil temperature is higher than the wax precipitation point and optimum interval of pigging should be figured out to make reasonable pigging plans accordingly. （1 Figure, 1 Table, 6 References）