Abstract
Six corrosion inhibitors have been evaluated for carbon steel in the absence and presence of inhibitors in Arabian Gulf Seawater under downhole conditions. The corrosion rates of carbon steel were determined under four rotational velocities using a Rotating Disc Electrode (RDE) method. Results from RDE were also correlated with the corrosion rates of carbon steel from the Wheel Test Method. The specimens and various concentrations of inhibitors were placed in the bottles of the wheel test for fourteen days after which the weight loss has been determined.

Results obtained from the RDE and the wheel test indicated that most effective corrosion inhibitor for carbon steel in Arabian Gulf Seawater under downhole conditions is an amide-based one at a concentration of 5 to 10 ppm.