Corrosion inhibitors iron counts

FIG. 6—Contour plot for J-55 Inhibitor concentrations necessary to achieve 1 mpy based on final corrosion rates from Iron counts. 

Frequently iron counts are used as a means of monitoring corrosion and the effectiveness of inhibitor treatments in gas wells. Interpreting iron counts without supporting data can he misleading. In order to properly assess iron counts the chloride content, rate of water production, and information as to hydrogen sulfide or carbon dioxide content of gas is necessary. 

The water is not primarily from the formation corrosion will occur over the entire tubing string and well head.With only trace amounts of CO2 and HjS, severity will decrease with increasing water production. However, inhibition may become more difficult due to the tendency of water to desorb or wash the inhibitor film from equipment. Iron counts of 50 or less are desirable with permissible count decreasing as water increases. 

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