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Correction of test parameters for magnetic coupling high pressure rheometer testing system
LIU Gang1, ZHOU Ying1, MIAO Qing2, ZHANG Yongxiang3, LI Bingfan1
(1.Shandong Provincial Key Laboratory of Oil & Gas Storage & Transportation Safety in China University of Petroleum(East China),Qingdao 266580, China;2.PetroChina Key Laboratory of Oil & Gas Storage and Transportation, Langfang 065000, China;3.PetroChina Pipeline Engineering Company Limited, Langfang 065000, China)
Abstract:
Due to the magnetic coupling between the internal and external magnetic rings, the rotation of the two rings is not synchronous, therefore the problem of delayed start-up occurs, which results in large deviation of the rheometer test data. In order to solve this problem, according to the torque balance of the internal and external magnetic rings and the coupling characteristics of the internal and external magnetic forces, a physical model of the transmission process of the magnetic coupling rotary rheometer was established. The high pressure rheometer, HAAKE-MARS 60 was used to correct the measurement parameters of the Newtonian fluid under the condition of constant shearing rate.The results show that the true shear stress on the surface of the internal magnetic ring becomes much bigger than that of the external ring, with the increase of the viscosity of the tested material, the decrease of the shear rate, and the increase of the fluctuation amplitude of the internal rotor speed. It is found that the viscosity correction value is close to the true viscosity,as the difference between the motor torque of the rheometer and the load torque acting on the fluid is considered, as well as the difference between the rotational speed of the internal and external magnetic rings during the test. The higher the viscosity, the higher the shear rate, and the better the viscosity correction effect is. Altogether, the problem of "distortion" of rheological test results under the high-pressure rheometer test system has been solved successfully.
Key words:  magnetic coupling  torque transfer  viscosity correction  lags in response