After oil pipeline was used for a period of time,viscidity molecule in crude oil would deposit on pipe wall and therefore pipe wall was reduced and pressure drop and energy consumption were increased.

• 原油输送管道经过一定时间的使用，由于原油中粘性分子在管壁的沉积，造成实际输油管径减少，压降增大，大大增强了系统能耗。