Impact of Souring on FeCO3 Corrosion Products

Abstract Simulation of reservoir souring has been a heretofore neglected area of corrosion research. The procedure followed herein involves forming a sweet corrosion product layer, addition of 100ppm of H2S, and allowing the system to continue to evolve. The experimental apparatus used was a 2L glass cell with 5 X65 steel specimens evenly spaced, which allowed for in situ corrosion rate monitoring and extraction of specimens for surface analysis. When the FeCO3 was challenged with H2S, the general corrosion rate remained the same. FeS was detected on the samples, but no significant change was observed in the FeCO3. However, there was a significant change in the open circuit potential (OCP) immediately following the addition of H2S to the system.