Evaluation of Thixotropic Models of Waxy Crude

Abstract:

Article Preview

Thixotropy, which is an important rheological behavior of waxy crudes, is very important to the hydraulic characteristics and safety of the restart process of crude oil pipelines. Thixotropic behaviors of four waxy crudes were studied experimentally under three kinds of loading conditions, which were constant shear rate, stepwise increase of shear rate and cyclic change of shear rate, namely hysteresis loop. Eight thixotropic models were evaluated by least-square regressions based on experimental data. The average absolute deviation was taken as the measurement of fitness of a model. It is concluded that the model, which was established on the basis of Houska model and Cheng’s idea that wax crude oil contains both complete and partial reversibility structures, is the most suitable model to describe the thixotropy of wax crude oil

Info:

Periodical:

Advanced Materials Research (Volumes 581-582)

Edited by:

Jimmy (C.M.) Kao, Wen-Pei Sung and Ran Chen

Pages:

85-88

Citation:

L. P. Guo et al., "Evaluation of Thixotropic Models of Waxy Crude", Advanced Materials Research, Vols. 581-582, pp. 85-88, 2012

Online since:

October 2012

Export:

Price:

$41.00

[1] Houska M. Engineering aspects of the rheology of thixotrpic liquids[D], Prague: Czech Technical University of Prague, (1981).

[2] Chen HJ: Study on restart pressure of crude oil pipeline, M. Sc. hesis, China University of Petroleum, Beijing (2002).

[3] Huang C R. A thermodynamic approach to generalized rheological equations of state for time-dependent and time-independent non-Newtonian fluids [J]. The Chemical Engineering Journal, 1972, 3: 100–104.

DOI: https://doi.org/10.1016/0300-9467(72)85011-1

[4] Fang Bo, Jinhao. Studies on constitutive equation of blood hysteresis loop(Ⅰ)Constitutive equation of blood hysteresis loop showing viscoelasticity and thixotropy simultaneously: The sixth rheology academic meeting, Wuhan, 1999[C]. Central China University of Science and Technology Press, (1999).

[20] Fang B, Jin H, Jiang TQ: Proceedings of the Sixth National Conference on Rheology, Wuhan, China (1999).

[5] Fang B, Song DY, Jiang TQ: Study on the novel 7-parameter constitutive equation for viscoelastic-thixotropic fluids. Proceedings of the Sixth National Conference on Rheology, Wuhan, China (1999).

[6] Hou Lei, Zhang Jinjun. Study on thixotropy of waxy crude based on viscoelasticity analysis[J]. China's oil university press(Natural science edition) 2005, 29(4): 84 – 94.

[7] Liu Gang, Zhang Guozhong and Deng Yan. Viscoelasticity-thixotropy constitutive equation for gelled crude oil[J]. China's oil university press (Natural science edition): 2003, 27(6): 72-75.