Running scheme optimization of Shikong-Lanzhou Waxy Crude Oil Pipeline

Based on the oil temperature, soil temperature and the physical properties of the oil around Shikong-Lanzhou Waxy Crude Oil Pipeline, three kinds of transport processes, transportation at normal temperature, heating transportation and transportation of agent added integrated heat treatment, are adopted, and the inlet oil temperature downstream should not be less than 22 ℃, 20 ℃ and 17 ℃, respectively. The whole year is divided into four operation periods, spring, summer, autumn, and winter, and the specific operation schemes at different throughputs are refined, which include detailed requirements on oil temperature control, schemes for unusual running conditions and support scheme under the failure of adding system in agent added transportation. The running scheme requires that the inlet oil temperature should be 3 ℃ higher than the solidifying point, the outlet oil temperature for hot oil should be no lower than 50 ℃, the amount of agent for integrated heat treatment should not be less than 25 g/t in January and February, and 12.5 g/t in the rest months. In addition, as to the economical efficiency, agent added integrated heat treatment is much better than the heating transportation.