环道内胶凝原油启动屈服应力计算  

Start-up yield stress calculation of gelled crude oil in loop

作　　者：翟克平 张国忠 刘刚[1] 李晨曦[2] 

机构地区：[1]中国石油大学储运与建筑工程学院,山东青岛266580 [2]新疆石油勘察设计研究院,新疆克拉玛依834000

出　　处：《油气储运》2015年第11期1181-1184,共4页Oil & Gas Storage and Transportation

基　　金：中国石油科技创新基金资助项目"杂质沉积对成品油管线运行可靠性影响机制研究";2014D-5006-0604;中央高校基本科研业务费专项资金资助"基于大震荡剪切(LAOS)作用的胶凝原油非线性流变特性研究";14CX02107A

摘　　要：为了准确计算管内胶凝原油启动屈服应力,进而预测管内凝油启动过程所需压力,以管流环道试验为基础,分析控制流量启动过程中环道沿线的压力变化,重新定义环道内胶凝原油启动屈服应力,并提出相应的计算方法。将环道内胶凝原油启动屈服应力定义为:在某一特定启动流量下,试验环道全线初始启动时刻,环道末端凝油所受的管壁剪切应力。同时,利用多项式拟合获得初始启动时刻沿线压力表达式,对表达式在环道末端极限位置求导计算环道内凝油启动屈服应力,物理意义明确。To accurately predict the start-up pressures required in start-up process of gelled crude oil pipeline, it＇s very important to calculate start-up yield stress of gelled crude oil. On the basis of pipe flow loop experiment, pressures versus time at each location along loop during the controlled flow start-up are analyzed to redefine start-up yield stress of gelled crude oil in loop and propose a new way to calculate it. The start-up yield stress of gelled crude oil in loop can be defined as the shear stress that the gelled crude oil on the wall experienced in the end of experimental loop at start-up time under specific start-up flowrate. Based on the definition of the start-up yield stress, the pressure distribution expression in the start time can be obtained by applying polynomial fitting. In addition, through derivation of the expression at the extreme end of the loop, start-up yield stress of gelled crude oil with well-defined physical significances can be obtained.

关 键 词：试验环道 胶凝原油 启动屈服应力 屈服时刻 初始启动时刻 

分 类 号：TE832[石油与天然气工程—油气储运工程]