THE TIME-TEMPERATURE-STRESS EQUIVALENCE OF CREEP BEHAVIOR OF GELLED CRUDE OIL
胶凝原油蠕变的时间-温度-应力等效性

The security of waxy crude oil pipeline in the process of stop-restart is severely affected by the rheological properties of gelled crude oil, expecially the viscoelastic creep property. The parameters such as stress, time and temperature have to be considered at the same time in describing the viscoelastic behavior Of gelled crude oil. Creep experiments are conducted under different stresses and temperatures. The results indicate that the changes of stress and time have similar effects on the creep characteristic time of gelled crude oil. Nonlinear creep behavior is analyzed by means of the equivalence principle of time-temperature-stress. The main creep curve under reference stress and reference temperature is obtained, by fitting with the viscoelastic rheological model. So the long-term creep behavior under lower temperature and stress can be predicted by short-term creep behavior under higher temperature and stress.