Several API J55 steel tubings failed due to localized corrosion, after a year in service in water injector wells at an oil field. Microscopy observations, chemical analyses and computational fluid dynamic (CFD) numerical simulations were performed to determine the degradation mechanisms. Sulfate-Reducing Bacteria (SRB) activated the localized corrosion mechanism: pitting corrosion and cracking. Numerical flow rate results at failure locations were compared with those obtained in laboratory by different researchers, showing a particularly good correlation. Corrosion rates by SRB were found to be particularly high beneath calcareous deposits in watertight areas between packers, where the punch is located, and when flow rates are less than 0.17 m/s. Unfortunately, avoiding fluid stagnation is not feasible; cathodic protection with sacrificial electrodes is most effective to prevent localized SRB-induced corrosion in the tubing.

在油田注水井中使用一年后，一些 API J55 钢管由于局部腐蚀而失效。进行显微镜观察、化学分析和计算流体动力学 (CFD) 数值模拟以确定降解机制。硫酸盐还原菌 (SRB) 激活了局部腐蚀机制：点腐蚀和开裂。故障位置处的数值流量结果与不同研究人员在实验室获得的结果进行了比较，显示出特别好的相关性。发现 SRB 的腐蚀速率在封隔器之间的水密区域的钙质沉积物下方特别高，冲头所在的位置，当流速小于 0.17 m/s 时。不幸的是，避免流体停滞是不可行的。