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Flow properties of waxy crude oils,particularly the beneficiated waxy crude oils,are sensitive to shear history that the crude oil experienced,called the shear history effect.To simulate this shear history effect accurately is vital to pipeline design and operation.It has been demonstrated by our previous that the energy dissipation or entropy generation due to viscous flow in the shear process is a suitable parameter for simulating the shear history effect.In order to further verify the reliability of this approach,experimental simulations were conducted for three PPD-beneficiated waxy crude oils transported through the China West Crude Oil Pipeline,a most complicated long-distance-crude-oil-pipeline technically and operationally so far in China.The simulations were made by using a stirred vessel and with the energy dissipation of viscous flow as the shear simulation parameter.Comparison between the flow properties of crude oils obtained from field test and experimental simulations,it is found that the gel points and viscosities from experimental simulations are in good agreement with the field data. 相似文献
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六参数含蜡原油触变模型 总被引:4,自引:0,他引:4
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。 相似文献
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