Study on the Yield-Thixotropy of Waxy Crude Oil under Uniform Sweeping Rate of Share Rate

Abstract:

Yield-thixotropy is an important time dependent rheological behavior of gelled waxy crude oil. In order to study the yield-thixotropic behavior of gelled waxy crude oil under cyclic shearing of linear increasing and decreasing of shear rate, four different types of waxy crude oil were studied experimentally by using RS150H rheometer. It is found that because the recovery rate of wax crystal structure is slow, study should be focus on the first loop. At a certain temperature, the hysteresis loop moves away from the share rate axis and the area of the loop becomes larger with increased rate of share rate sweep; and vice versa, the loop moves toward the share rate axis and the area of the loop becomes smaller with decreased rate of share rate sweep. And the yield stress is also reduced and the yielding time increased with decreased rate of share rate sweep. In addition, based on the experimental results an empirical correlation is developed to describe the relationship of yielding time and rate of share rate sweep.

• Periodical: Advanced Materials Research (Volumes 706-708)
• Pages: 297-300
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.706-708.297
• Online since: June 2013
• Authors: Li Ping Guo, Mo Xiao Liu, Gui Ying Xu
• Keywords: Thixotropy Hysteresis Loop, Waxy Crude, Yielding

References

[1] Visintin RFG, Lapasin R, Vignati E, D'Antona P, Lockhart TP. Rheological behavior and structural interpretation of waxy crude oil gels. J. Langmuir 21, 6240–6249 (2005)

DOI: 10.1021/la050705k

[2] Hou Lei, Zhang Jinjun. An Experimental Study on Yield Characteristics of Waxy Crude Oil .J. Journal of Oil and Gas Technology. 6, 99-102 (2007)