Abstract
In this paper, we report experiences assessing real time corrosion inhibitors performance employing corrosion inhibitors currently used in the field in the Gulf of Mexico. The onset of the corrosion inhibitor performance in reducing the corrosion rate was clearly monitored in seven minutes intervals after the inhibitor application. By controlling the inhibitor concentration in the range of 5 to 100 ppm, corrosion rates are determined in time evolution from over 150 mpy to less than 1 mpy in the best performing chemical treatments. The real time corrosion monitoring equipment which includes several techniques: linear polarization resistance (LPR), harmonic analysis (HA), and electrochemical noise (EN). Environments include 3 % NaCl solution with and without 10 % diesel, saturated with CO2 at 50°C. Both, LPR and HA techniques had a quick answer, within 7 minutes, however, HA showed big fluctuations although similar trend in the corrosion rate to those given by the LPR technique. On the other hand, regarding localized type of corrosion, the results given by the EN and HA techniques, as measured by the pitting factor, were dissimilar too regardless of the used solution, because the pitting factor values increased as son as the inhibitors were added..
