Inhibited calcium bromide brines can cause severe localized corrosion of steels as a result of CO2 acidification. In contrast, formate brines cause only slight general corrosion of steels after acidification. An operator wishing to drill, complete or work over a well with a clear fluid has to decide between halide or formate brines. The corrosivity of the brine under expected wellbore conditions is a key criterion used in the fluid selection process. With proper pH control, both calcium halide brines (CaBr2 and CaCl2) and formate brines (NaCOOH, KCOOH and CsCOOH)...

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