Title Corrosion And Inhibition Study For Water Reinjection System: A Field Investigation Using Electrochemical Techniques Authors Hongbin Wang, Dave Fell, and Steve Bailey Address Clariant Oil Services 8701 New Trails Dr. Suite 100 The Woodlands, TX 77381 Abstract The corroded field pipeline segments suggested that iron sulfide containing solids deposited on the metal played a critical role in the corrosion and inhibition processes in a water injection system. However, inconsistent corrosion results were obtained in the field by monthly-retrieved corrosion coupons and 2-electrode LPR probe with a simple data logger. Obviously, the corrosion scenario in the system was complicated by the iron sulfide scaling issue which was a result of mixing different H2S containing waters. However, both techniques were not able to provide insights to the corrosion scenario when substantial iron sulfide scale formation was a consideration. This paper presents the results of a field investigation using three electrochemical techniques: LPR, EIS, and electrochemical noise. Furthermore, the scaling and corrosion inhibition issues were addressed together to maintain the pipeline integrity and control the scale formation.