六参数含蜡原油触变模型  

A six-parameter thixotropic model for waxy crude oil

作　　者：贾邦龙[1,2] 张劲军[1,2] 

机构地区：[1]中国石油大学油气管道输送安全国家工程实验室,北京102249 [2]中国石油大学城市油气输配技术北京市重点实验室,北京102249

出　　处：《石油学报》2012年第6期1080-1085,共6页Acta Petrolei Sinica

基　　金：国家自然科学基金重点项目(No.51134006);北京市优秀博士学位论文指导教师科技项目(YB20081141401)资助

摘　　要：含蜡原油在较低温度下具有典型的触变特征,触变模型是含蜡原油输送管道再启动数值模拟的基础。在分析现有触变模型的基础上,结合含蜡原油的特性以及悬浮体系流变学的相关理论,提出了一个适用于含蜡原油的包含6个参数的黏塑性触变模型,并利用基于剪切率阶跃方法测试的触变数据对该模型进行了检验。结果表明,该模型对触变数据的拟合效果优于目前常用的包含8个参数的Houska模型,与12个参数的双结构参数模型相当。与Houska模型和双结构参数模型相比,所提出的六参数模型因拟合参数少且状态方程形式较为简单,通过优化算法拟合确定的触变参数定性上更为合理,更适用于含蜡原油管道停输再启动数值模拟。Thixotropy is one of the typical rheological characteristics of waxy crude at low temperatures,and a thixotropic model is essential for numerical simulation of pipeline restart.In this paper,based on the analysis of existing thixotropic models and combined with characteristics of waxy crude and related theories of suspension rheology,we proposed a viscoplastic model with six parameters to describe thixotropic behaviors of waxy crude.The capability of this model in fitting experimental data was verified using thixotropic data obtained from tests by the step gradient method of shear rate.The result shows that the fitting effect of this six-parameter model about experimental data is equivalent to that of the double-structural-parameter model with twelve parameters,much better than that of the conventional eight-parameter Houska model.Besides,compared with the two existing models,parameter values obtained from data regression with this proposed model are physically more reasonable thanks to less parameters and simpler state equations.Consequently,this six-parameter model may be more suitable for the numerical simulation of pipeline restart.

关 键 词：含蜡原油 触变性 黏塑性 模型 停输再启动 

分 类 号：TE732[石油与天然气工程]