Abstract:

It is very difficult to measure rheological parameters accurately because of the complicated components of waxy crude oils and the rheological parameters depending on the thermal history, shear history and other uncertain factors. The crude oil from Xinmiao, Daqing oilfield, is used as a sample. The effects of cooling and shear rate, test time and cooling rate on its static yield stress and rheological curve at low temperature respectively, the influence of heat treatment temperature, cooling methods and cooling rate on its viscositytemperature curve are all discussed by using the rheological test and analysis methods. The results indicate that the rheological parameters of a nonNewtonian waxy crude oil highly depend on the experimental conditions. Then a decision thinking that such experimental conditions as cooling rate, shear rate and test time should be decided by simulation calculation and reasonable design based on various test purposes is proposed, which provides a reference to the measurement of rheological parameters of other waxy oils.
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Key words: waxy crude oil, non newtonian fluid, rheological parameters, measurement conditions, experimental methods.