摘要
在管道全线配泵方案不变的情况下,漠大原油管道输量异常下降,由2 300 m^3/h逐渐降低至2 100 m^3/h,管道运行效率降低,影响输油任务。通过计算各管段单位摩阻损失,发现摩阻异常增大出现在漠河站与加格达奇泵站之间,对比分析了油品物性、管道沿线油温、地温数据、减阻剂添加效果和站场工艺变更等影响因素,经过现场调研,确定原因为:1为塔河站新投用的轴流式单向阀对减阻剂产生剪切导致减阻剂失效;2该管段存在结蜡。通过采取切换塔河站流程和站间清管两方面措施,管道输量恢复正常状态,降低了漠河首站库存增加的风险。基于上述,针对管道冬季定期清管,以及俄油冬季动火施工引起结蜡和增输改造的相关研究提出了建议。
The flow rate of Mohe-Daqing Oil Pipeline declined abnormally from 2 300 m^3/h to 2 100 m^3/h while the deployment of pumps along the pipeline was constant. As a result, the pipeline operation efficiency reduced, impacting the performance of oil transportation. In order to find out the reasons for the decline of flow rate, the unit frictional resistance losses of each pipeline section was calculated. It is shown that the frictional resistance between Mohe station and Jiagedaqi pump station increased dramatically. Then, the influential factors were comparatively analyzed, including physical properties of oil product, oil temperature and ground temperature along the pipeline, effects of drag reduction agent（DRA） addition and process change at stations. Based on field investigation, it is indicated that there are two reasons for the decline of flow rate. On the one hand, the shear effect on DRA from axial-flow one-way valve which was newly put into operation in Tahe station led to DRA failure. On the other hand, wax deposition existed in this pipeline section. After two measures were taken, i.e. process switch of Tahe station and pigging between stations, the flow rate is recovered to the normal level and the risk of inventory increasing in Mohe station is reduced. Based on the above analysis and research, a series of suggestions were proposed to deal with periodic pigging in winter, wax deposition caused by hot work of Russia oil in winter and research of flow-enhancement reform.
作者
王中良
WANG Zhongliang(PetroChina Oil ＆ Gas Pipeline Control Cente)
出处
《油气储运》
CAS
北大核心
2017年第3期354-360,共7页
Oil & Gas Storage and Transportation
关键词
原油管道
流量降低
减阻剂失效
结蜡
流程切换
清管
oil pipeline
flow rate decline
DRA failure
wax deposition
process switch
pigging
