Research On Cathodic Protection Technology Of Xiaohe-jingbian Oil Pipeline

Oil pipeline most with steel tube is given priority to, the soil physical andchemical properties of the in homogeneity of the metal material and the electrochemical inhomogeneity, constitute the electrochemical corrosion of buried pipelines conditions, and thesoil bacteria corrosion and stray current corrosion, metal pipe intounderground must suffer from serious corrosion. The yanchang oilfield has established a mediumdiameter of the crude oil pipeline in extensive "coating protection is given priority to,cathodic protection for auxiliary joint protection method, after More than ten years of operation, part of thecrude oil pipeline of protective coating damage and aging cathode system such as theprotection of long-term owe factors, in order to reduce various accidents caused by corrosion and leakage, ensure long-buried pipelines safe and stable operation, Must be carried out systematic study on cathodic protection.This paper through the field test and dataprocessing analysis methods,as the yanchang oil (Group) The oil unit xiaohe-Jingbian crude oil pipeline as the research object.study for buried oil pipeline corrosion mechanism of outside and law. Theresults of the study show that: Pipeline steel corrosion and corrosion speed from potential by soilhumidity and oxygen levels big effect. Along pipeline stray current, soil formation in thevarious corrosion macro battery and conveying sometimes also cause high pressure pipelinecorrosion of the main causes of the leak. Cathodic protection potential measurement methoddefect, protectivecoating quality to the changes and the changes of soil environment can lead to cathodicprotection system failure. In order to reduce the Perforation of xiaohe-jingbian crude oil pipeline corrosion,Cathodic protection according to various parameters should be comprehensive factors make corresponding adjustment, The author puts forward long-term and raise the replacement than electrode, the method of Sacrificial anode and applied current combination, to strengthen the management of cathodic protection systemand monitoring of the optimization scheme.