中原油田文10—1井套管腐蚀原因分析

FAILURE ANALYSIS OF CORRODED CASING PIPE

通过现场检测和腐蚀产物Ｘ衍射分析，对文１０－１井套管的腐蚀原因进行了探讨。检测结果表明是以内壁腐蚀为主；套管上部腐蚀严重，下部腐蚀轻微，两者腐蚀产物中铁的硫化物不同。室内试验研究了温度对硫酸盐还原菌（ＳＲＢ）生长的影响，以及ＳＲＢ对套管钢的腐蚀作用。文１０－１井套管严重腐蚀部位的腐蚀产物为疏松的Ｆｅ９Ｓ８，而腐蚀轻微处主要是较致密的ＦｅＳ。

The causes of corrosion of casings at 'Wen Well 10-1' were studied by visual examination of the corroded casing pipe and x-ray analysis of corrosion products. Results showed that inner corrosion was the primary factor for pipe perforation. The corrosion on the upper part of the pipe was more serious while that on the lower pat was slight. That corresponded to the different kinds of iron sulfides in the corrosion products. Labroatory tests were carried out for the effect of temperature on the growth of sulfate reducing becteria (SRB) and for the role SRB played in corrosion of casing pipe steel. Conclusion could be drawn that the corrosion product on the seriously corroded pipe was loose Fe9S8 while that on the slightly corroded pipe was mainly dense FeS.