Effect on Oil Transporting Optimization for Pipeline Caused by Wax Deposition and Various Constraint Values

The effect on oil transporting optimization for pipeline caused by wax deposition and various constraint values is investigated. It is firstly outlined in this paper that there is a dangerous zone for pipeline operation, defined by the thickness of wax deposition on inner pipe wall. The results show that the factors such as states of wax deposition, pressure capacity for pipeline, pump behavior, requirements for oil flow pressure entering or leaving pump station and oil temperature at terminal, and so on, play a very important role in optimization process. They are closely connected and influenced each other. The optimal scheme would be different if a value among them were changed. It is very necessary to determine these constraint values carefully and reasonably before performing analysis in order to obtain a satisfactory transporting scheme from which both operation safety and economy could be guaranteed when it is applied to engineering practice.Another problem to be focused on is that the bottlenecks for oil transporting in pipeline would be generated if the oil temperature at terminal were not properly determined under serious wax deposition condition.