Advertisement

Low-temperature flowability characteristic of waxy crude

  • Chen Jun  (陈俊)
  • Zhang Jin-jun  (张劲军)Email author
  • Li Hong-ying  (李鸿英)
Article

Abstract

Viscosity variation with temperature was measured by temperature scanning procedures in a coaxial cylinder viscometer. An eigen-temperature is found in viscosity-temperature chart generated from the temperature sweep experiment. It is the temperature corresponding to the maximum value of the curvature of a non-dimensional viscosity-temperature chart. The experimental results show that the eigen-temperature varies linearly with shear rate and cooling rate. Eigen-temperatures decrease either with decreasing the shear rate or with increasing the cooling rate. The eigen-temperatures of PPD-beneficiated crudes are more sensitive to the shear and cooling rate than those of virgin crudes. The eigen-temperature of virgin crude is almost equal to its pour point, while the eigen-temperature of PPD-beneficiated crude is much lower than its pour point. This indicates that the eigen-temperature may be applied to assess the flowability of waxy crudes with various shear and thermal histories, and may also provide a new means to evaluate the effect of PPD on the low-temperature flowability of waxy crude.

Key words

waxy crude low-temperature flowability viscosity-temperature chart 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    WARDHAUGH L T, BOGER D V. Flow characteristics of waxy crude oils: Application to pipeline design[J]. AIChE Journal, 1991, 37(6): 871–885.CrossRefGoogle Scholar
  2. [2]
    ZHANG Jin-jun, LIU Zhong-hui, ZHANG Fan, et al. Waxy crude treated with pour-point-depressants: Flow behavior and its evaluation[C]// Proceedings of the 1997 International Symposium on Multiphase Fluid, Non-Newtonian Fluid and Physico-Chemical Fluid Flows, ISMNP’97. Beijing: Int Acad Publish, 1997.Google Scholar
  3. [3]
    ASTM D5133-99 standard test method for low temperature, low shear rate, viscosity/temperature dependence of lubricating oils using a temperature-scanning technique[S]. Annual Book of ASTM, 2001.Google Scholar
  4. [4]
    RIGA A T, ROBY S H. Low-temperature properties of crankcase motor oils: A fundamental approach to pumpability phenomena[J]. Lubrication Engineering, 1994(5): 411–417.Google Scholar

Copyright information

© Central South University Press, Sole distributor outside Mainland China: Springer 2007

Authors and Affiliations

  • Chen Jun  (陈俊)
    • 1
    • 2
  • Zhang Jin-jun  (张劲军)
    • 1
    Email author
  • Li Hong-ying  (李鸿英)
    • 1
  1. 1.Beijing Key Laboratory of Urban Oil and Gas Distribution TechnologyChina University of Petroleum(Beijing)BeijingChina
  2. 2.Beijing Huayou Natural Gas Co. LtdBeijingChina

Personalised recommendations