Yield Behavior of Waxy Crude Gel: Effect of Isothermal Structure Development before Prior Applied Stress

Yield Behavior of Waxy Crude Gel: Effect of Isothermal Structure Development before Prior Applied Stress
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含蜡粗凝胶的屈服行为:预先施加应力之前等温结构发展的影响

DOI:
10.1021/ie301047g
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发表时间:
2012-08
影响因子:
4.2
通讯作者:
Zhang Jinjun
Zhang Jinjun
中科院分区:
工程技术3区
文献类型:
--
作者:
Jia Banglong;Zhang Jinjun

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含蜡原油的流变性能取决于剪切史和热史。不考虑热条件,对含蜡原油的剪切效应进行研究是没有价值的。目前,研究含蜡原油剪切效应的主要方法是采用不同的冷却速率或剪切温度;关于等温构造发育对剪切效应影响的研究报道较少。目前的研究表明,即使在低于蜡样温度的恒定温度下,含蜡粗凝胶的特性也会随着静止时间的延长而发生变化,变得更加坚硬和稳定。在本文中,将一种典型的含蜡原油样品在接近胶凝温度的温度下,在0-60分钟的等温范围内静置,使其结构发育,然后在相同温度下,在1-100 Pa的宽范围内施加恒定应力。在随后冷却至2℃以下后,…
The rheological properties of waxy crude oil are dependent upon the shear and thermal histories. It would not be valuable to study the shear effect of waxy crude oil without consideration of the thermal conditions. Currently, researchers study the shear effect of waxy crude oil mainly with different cooling rates or shear temperatures; few studies have been reported about the influence of isothermal structure development on the shear effect. Present studies show that, even at constant temperature below the wax appearance temperature, the characteristics of the waxy crude gels undergo a change with quiescent duration, becoming harder and more stable. In this paper, a specimen of a typical waxy crude oil was held isothermally and quiescently for a time in the range of 0–60 min for structure development at temperatures close to the gelation temperature, followed by the application of constant stress in a wide range of 1–100 Pa at the same temperature. After subsequent cooling to below a temperature of 2 °C, ...
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