Effects of stress and oscillatory frequency on the structural properties of Daqing gelled crude oil at different temperatures
Effects of stress and oscillatory frequency on the structural properties of Daqing gelled crude oil at different temperatures
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DOI：
10.1016/j.petrol.2008.12.018
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发表时间：
2009-04
影响因子：
--
通讯作者：
Chuanxian Li;Qinzheng Yang;Mingzhen Lin
中科院分区：
文献类型：
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作者：
Chuanxian Li;Qinzheng Yang;Mingzhen Lin
利用可控应力流变仪在振荡剪切模式下研究了大庆胶凝含蜡原油的结构特性。结果表明，胶凝含蜡原油具有粘弹性。原油的线性粘弹区和屈服区不仅可以由临界线性剪应力（τcl）和屈服应力（τy）确定，而且可以分别由临界线性剪应变（γcl）和屈服应变（γy）确定。随着试验温度的降低，τ c_l和τ_y显著增大，γ c_l和γ_y逐渐减小。原油在较低温度下表现出更大的弹性。在所测范围内，频率对原油结构影响不大。
The structural properties of Daqing gelled waxy crude oil were studied with a controlled-stress rheometer under oscillatory shear mode. Our results demonstrate that the gelled waxy crude oil shows viscoelastic properties. The linear viscoelastic region and yielding of crude oil can be determined not only by the critical linear shear stress (τcl) and yield stress (τy), but also by the critical linear shear strain (γcl) and yield strain (γy) respectively. With the decrease of test temperature, τcland τyincreased greatly while γcland γydecreased gradually. The crude oil showed more elastic at lower temperatures. The frequency had little effect on the structure of crude oils in the measured range.