Agitator tank device and drag reduction agent evaluation

The device that consists of tank and disk agitator for evaluation drag reduction agents(DRA) was established.The effect of DRA was defined by testing the changes of agitator torque that drives the disk rotation.The HG-DRA for oil pipeline from Linyi to Puyang was studied by agitator tank device.The relationships between the drag reduction rate and Reynolds number,concentration,balance time were studied.The best concentration and the highest Renords number for the best drag reduction rate were confirmed.The results show that the drag reduction rate tested in agitator tank is close to that in pipeline.The maximum error of drag reduction rate between pipeline and agitator tank is 18.3%,which indicates that the agitator tank device is available to evaluate the effect of DRA for pipeline and it also has the advantages of simple,easy to be operated and using small volume of oil.Those are very helpful for operaters to know the properties of DRA and operate pipeline well.     

减阻剂减阻效果的评价与分析

针对临邑-濮阳管道添加HG减阻剂的输油工况,建立并运用旋转圆盘装置进行了管输原油加剂模拟实验。对临濮线加HG减阻剂的减阻效果和影响因素进行了分析,确定了减阻率与雷诺数;减阻率与剪切强度;减阻率与加剂浓度;减阻率与输油温度等关系,为减阻剂减阻效果的评价和研究提供了一种新的方法。     

油田集输系统不稳定流动对进站设施设计的影响

油田集输系统中经常会发生不同程度的段塞流,使集输管线流量发生一定程度的波动,引起集输管网和集中处理站入口装置运行不稳定。在设计入口装置(通常是一级分离器)时需要考虑进站流体波动的影响,以防止入口流量超过一级分离器设计处理量造成停产等事故。在设计分离器时,通过选取合适的设计系数的方法可以在一定程度上减缓集输系统流量波动带来的影响,但是经验系数的选取往往不能从根本上解决不稳定流动问题,必须对集输系统进行动态分析。对中东某油田集输系统中的入口流量、地形起伏和清管等工况进行了模拟,发现现有分离器在集中处理站入口油气不稳定流动的条件下能够保证稳定运行,集中处理站入口一级分离器设计系数为1.4的工况是因产量的波动而造成的。