油套管腐蚀与防护技术发展现状

Current Status of Casing/Tubing Corrosion and Protection Technology

介绍了国内外油套管腐蚀与防护的研究现状,分析了油气田开发过程中溶解气体腐蚀、细菌腐蚀、溶解盐腐蚀和温度、pH值及流速对油套管腐蚀的影响,探讨了国内外耐蚀合金、表面涂镀层、阴极保护及加注缓蚀剂等防腐技术的特点及其在油气开采中的应用。最后指出,油气井腐蚀环境不尽相同,每种防腐技术都有其使用条件的局限性,应该建立完善的井下监测系统,准确分析油气井管柱服役环境,针对不同的油气开采环境,选择适当的措施进行综合防护。

The current status of casing/tubing corrosion and protection at home and abroad were introduced.The influence of dissloved gas corrosion, bacterial corrosion, dissolving salt corrosion and temperature, PH value and flow velocity on casing/ tubing corrosion were analyzed during oil and gas field development course, and the characteristics of corrosion resistant alloy , surface coating, cathodic protection and injecting corrosion inhibitor, as well as their application, were discussed. In the end , it pointed that the corrosion environment of oil well is not completely same with that of gas well, the service conditions of each corrosion resistance technology has its limitation. It should establish perfect underground monitoring system, accurately analyze service environment of oil and gas well tubular string, and should select appropriate measures to conduct comprehensive protection for different oil and gas exploitation environment.