THIXOTROPY OF WAXY OIL FLOWING THROUGH PIPELINE

An experimental instrument for researching pipe flow is used to study thixotropy of waxy oil flowing in pipeline. The results show that the effects of histories, including shear process before shut up of pipeline and the contract of crude oil in the shut up course, on the recovery of the waxy structure are uncertain. The uncertainty has little influence on equilibrium shear stress after restart up of oil flowing.