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Evaluation of Thixotropic Models for Waxy Crudes

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DOI: 10.4236/ojapps.2015.56031    3,315 Downloads   4,019 Views   Citations
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Liping Guo*, Xu Chen, Shuang Shi, Yu Wang, Xiaoyang Yu

Affiliation(s)

College of Petroleum Engineering, Northeast Petroleum University, Daqing, China.

ABSTRACT

Thixotropy is a great rheological behavior of waxy crudes oils and is of great importance for hydraulic characteristics and security of oil pipeline restart. In this paper, through the experiment of four waxy crudes, three kinds of thixotropic rheology characteristics in the conditions that shear stress decays under a constant shear rate, shear stress decays after shear rate steps up and hysteresis loop of shear rate cycle changes are studied . For eight thixotropic models, experimental data are fitted in the method of least-squares and average deviation is taken as a statistical indicator to evaluate the thixotropic models. It shows that the model with the idea of Cheng that completely reversible and totally irreversible structures both exist in waxy oil products and based on Houska model can describe thixotropic behaviors of waxy crudes most well.

KEYWORDS

Waxy Crude Oils, Thixotropy, Thixotropic Model

Cite this paper

Guo, L. , Chen, X. , Shi, S. , Wang, Y. and Yu, X. (2015) Evaluation of Thixotropic Models for Waxy Crudes. Open Journal of Applied Sciences, 5, 304-312. doi: 10.4236/ojapps.2015.56031.

Conflicts of Interest

The authors declare no conflicts of interest.

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