Summary The variation of the rheological properties of Daqing waxy crudes with their thermal history and their time effect are discussed. Rheological properties of Daqing crude were determined in the laboratory with rotational viscometers and U-tube devices. The feasibility of using the proper heat treatment to improve the low-temperature flow property of Daqing crude was studied. Field tests on three long-distance heated-crude pipelines showed good agreement with laboratory measurement. A mathematical model for determination of the optimum operation parameters of pipeline transportation is also given.
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Dafan et al. (1987) studied this question.
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