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Activation and repassivation of stainless steels in artificial brines [Elektronski vir]
Mujanović, Emir ...
The environment of an oil well is aggressive, due to the high temperatures, pressures and low pH values of the brine being pumped towards the surface. On top of that acidizing jobs are sometimes ...done, which entails injecting HCl into the oil well to increase production rates, thus dramatically reducing pH. The medium being pumped through the tubing to the surface is considered to be completely devoid of oxygen, which begs the question whether or not stainless steel can repassivate in such an environment. Several different stainless steels have been chosen for investigation, ranging from martensitic to duplex and austenitic. A series of tests has been done, ranging from potentiodynamic measurements to scratch tests and acidic depassivation experiments. The tests have been performed in deaerated NaCl brines with different chloride concentrations, temperatures, pressures and pH values to determine the applicability of the investigated steels. Effects of temperature, chloride concentration, chromium content and molybdenum content of the investigated stainless steels on repassivation are presented and critically discussed.
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