The paper discusses the application and partitioning behaviour of water-dispersible corrosion inhibitors in 2-phase production/pipeline systems with condensate as the hydrocarbon phase. The practice of
using the residual corrosion inhibitor concentration to monitor systems protection and to adjust treatment levels is evaluated. Recommendations are presented based on a good understanding of the
petitioning pathways. Case histories of two production systems are presented. In these systems, the production waters are very different in salinhy and the produced wated condensate ratios are drastically differerent. The first system produces very little water with no significant changes in the fluid ratios. The second system produces more water with fluctuating fluid ratios. Two new corrosion inhibitor blends were designed for the systems and the paper discusses laboratory and field testing related to the two systems. The monitoring techniques developed for each corrosion inhibitor key on one of the major components,
usually the more water-soluble/dispersible component. It was demonstrated that components of corrosion inhibitors designed to be completely water-soluble still partitions to the condensate. In one case, both phases were analyzed and the mass balance account for the inhibitor injected after the system equilibration. The pitfalls or drawbacks encounteredin analysis are discussed. In the second system, it
is demonstrated that residual analysis should be a guide rather than a determinant of performance. In the testing of a new corrosion inhibitor,concerns with low residual concentration levels were proven
among through performance monitoring using electrochemical techniques.