Study On The Prediction For Residual Life Of Oil Pipeline In Sevice

With the development of oil industry, the length of pipeline is increasing at a great speed.. Pipelines are buried underground for decades, they can unavoidably be corroded due to the corrosive environments around them. This problem becomes worse in pipelines that have a long serving time. The corrosion of pipeline has a great effect on the safety and economic benefits of pipeline administrators. Launching a research of the remaining life of corrosive pipeline will improve the ability to predict the potential dangerous sections, which is meaningful to reliable management and taking predictable maintenance measures of pipeline.Based on extensive collecting information and investigation in oil field, the writer analyses the corrosion types, mechanisms and crrosion effect factors of long-distance transportation pipeline.The basic thought of predicting the remaining life of pipeline, key points that affect the prediction, the emphasis should be laid during prediction and predicting solutions are described.The destination of this study is to solve the quantitative assessment of buried oil-pipeline corrosion residual life.The strength problem related to the prediction of pipeline remaining life is anlysed. This paper analyses the internal pressure along oil-pipiline,and from the explosion equation in B31G, the limit size model of corrosion defects is established;The prediction meas of residul life for many historical inspection data and single inspetion data are offered;The failure of long distance oil-pipeline is maily caused by the corrotin of outer wall,soil electrochemistry erode is the primary mechanism.Corrion defects are classified as three types:general corrosion,local corrosion and piting corrosion, rate of electrochemical corrosion of soil is derived respectively;The residual life prediction model is established on the corrosion rate model and limit size model of corrosion defects;The prediction of long distance oil-pipeline residual life is a system engineering actually,which covers detection ,safety evaluation and residual life assessment,this paper gives a residual life assessment project of buried oil-pipeline wich is based on relating criterions and standards.