The Effect of Heat Treatment Temperature on the Microscopic Wax Crystal Structure during Yield Stress Behavior of Waxy Crude Oil
The thermal condition is the main factor affecting the low-temperature rheological properties of waxy crude oil.In this paper,the effect of heat treatment temperature on the microscopic structure of wax crystals during the shear thinning process of waxy crude oil was investigated through microscopic experiments,in order to explore the effect law of thermal conditions on the rheological properties of waxy crude oil gel systems.The experimental results showed that the statistical parameters of the microscopic parameters of wax crystals under different heating temperatures had consistent trends with shear time,and the higher the heat treatment temperature,the larger the mean values of the area,particle size,and perimeter of the microscopic wax crystals at the same time,and the smaller the mean value of the length-to-diameter ratio of the wax crystals.After shear damage,during the dynamic equilibrium stage,the Delaunay triangles formed by the wax crystals re-aggregated with higher heat treatment temperatures were smaller and denser.During the isothermal recovery stage after shear cessation,waxy crude oil with higher heating temperatures exhibited better recovery performance.
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