Thixotropy tests of waxy crude oil under different rheometers and test systems

This paper carries out thixotropy tests for Daqing-Jidong Mixed Crude Oil by utilizing step jump loading mode of shear rate with different rheometers and testing systems, and performes comparison analysis for experimental results. Anton Paar rheometer is better in repeatability than HAAKE VT550 rotational rheometer, so crude rheology data obtained from Anton Paar rheometer is more stable and less variable, but the experimental error in yield value and balance value of gelled crude oil obtained from both rheometers are less than 23%. The experimental error in yield value and balance value of gelled crude oil obtained for different test systems with similar inner and outer cylinder diameter ratio are less than 25%, but the smaller the clearance is between outer and cylinder diameters, the faster the wax crystal structure breaks down, the more unstable the obtained experimental data is.