Feasibility Study On The Transforming A Crude Oil Pipeline Into A Water Pipeline In Africa

A crude oil pipeline with a length of 1505 km,a nominal pipe diameter of 610 mm and a design pressure of 8.39 MPa is developed in an African country.With the production of upstream oil fields decreasing year by year,the pipeline will face disposal.Considering that its integrity is in good condition at present,and the country needs long-distance water transportation due to the uneven distribution of water resources,it is of great practical significance to study the feasibility of transforming the pipeline into a water transportation pipeline.In this paper,ANSYS Workbench software is used to establish the residual strength evaluation model of pipeline with corrosion defects,and the accuracy of the model is verified based on the relevant data of the blasting test of pipeline with corrosion defects introduced in the literature.The model was applied to calculate the failure pressures of the pipes with different shapes and sizes of corrosion defects.The results show that the influence of corrosion depth on the failure pressures of pipes is much greater than that of corrosion length and width.Based on the calculation results,the curves of the maximum safe working pressure of the pipeline with different corrosion widths and lengths as a function of corrosion depth were drawn.In order to reduce the investment of the reconstruction project,the original pump station is used as much as possible in the design of the reconstruction project,so the optimization of the process design scheme of the reconstruction project comes down to the optimization of the layout of the pump station based on the candidate position.After the problem is transformed into the shortest path problem,the optimal scheme can be determined by using Dijkstra algorithm.According to a series of set water transport capacity,the present value of the total cost corresponding to the optimal process design of the reformed pipeline and the new pipeline is compared respectively,and the maximum economic water transport capacity of the reformed pipeline is determined to be 55000m~3/d.