The Change Law of Shutdown and Restart for ZhongLuo Oil Pipeline

The throughput rate is obviously reduced in ZhongLuo oil pipeline with the reduction of production in Zhongyuan oilfield. In order to avoid the reverse pumping and decrease production cost, the intermittent transportation process is operated as well as the transportation of adding pour depressant is adopted by ZhongLuo oil pipeline. While operating, the fluctuation of pressure and flow must be noticed while shutdown and restart. Through tracing and analyzing on intermittent operational parameters of ZhongLuo oil pipeline, it is pointed out that "a cold oil length" which entered the pipe in process of the shutdown and restart is an important effect which makes the fluctuation of pressure and flow of the pipe. The dimension of fluctuation have to do with the seasons and time of the shutdown as well as operation of the shutdown and restart, and some measures have been given for the above mentioned problems.