Experimental simulation of effect of shear on rheological properties of beneficiated waxy crude oils
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Flow properties such as viscosity and gel point 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 understand quantitatively this shear history effect is necessary to oil pipeline design and operation. For experimental simulation of the shear process during pipelining, shear rates of turbulent pipe flow, and flow through centrifugal pumps and throttle valves are necessary. Stirred vessels are usually used for shear simulation in laboratory, therefore, shear rate in the stirred vessels has to be known before shear simulation. Based on relationship between energy dissipation rate and the shear rate, approaches are developed and presented for calculation of shear rates in the above-mentioned specific flows. Combined with the entropy generation due to viscous flow in the shear process, which has been proved to be a proper parameter for simulation of the shear history effect, the shear history effect on viscosity and gel point of the beneficiated waxy crude oils has been experimentally simulated accurately.
Key wordswaxy crude oil rheology shear history effect simulation shear rate energy dissipation entropy generation
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- BOGER D V. From macroscopic to microscopic flows: something old, something new, and something very new[C]// Lee J W, Lee S J. Proceedings of XIV International Congress on Rheology. Seoul: The Korean Society of Rheology, 2004: PL01-1-PL01-3.Google Scholar
- ZHANG Jin-jun, LIU Zhong-hui, ZHANG Fan, et al. Waxy crude treated with pour-point-depressants: flow behavior and its evaluation[C]// ZHOU Li-xing, LI Xiang-fang. Proceedings of ISMNP’97. Beijing: International Academic Publishers, 1997: 7-15–7-20.Google Scholar
- ZHANG Jin-jun, ZHOU Shu-hui, LI Hong-ying, et al. Entropy generation as a parameter to simulate the shear history effect of the beneficiated waxy crude oils[C]// Lee J W, Lee S J. Proceedings of XIV International Congress on Rheology. Seoul: The Korean Society of Rheology, 2004: SU39-1–SU39-3.Google Scholar
- NENNIGER J. Method and apparatus for measurement and prediction of waxy crude characteristics[P]. US 5959194, 1999-09-28.Google Scholar
- QIAN Jian-hua, ZHANG Jin-jun, WANG Ke-zhong, et al. Pipelining of viscous waxy crude with the pour-point-depressant beneficiation: successful experience in the Lu-Ning pipeline[C]// Proceedings of 5th International Pipeline Conference. Calgary: ASME, 2004: 2047–2054.Google Scholar