Session: Corrosion Inhibitors in the Oil and Gas Industry (Part III of III)
The danger of relying on pre-partitioned conditions to select a corrosion inhibitor for a multiphase-system (C2026-00403)
Thursday, March 19, 2026
3:30 PM - 4:00 PM Central
Location: 362 DE
Earn .5 PDH
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It is commonly believed that effective corrosion inhibitors (CI) in multiphase systems should strongly partition into the water phase, especially in stratified flow. As a result, pre-partitioning studies are often prioritized. However, their relevance to field conditions is increasingly questioned. This study uses electrochemical impedance spectroscopy (EIS) to evaluate the significance of pre-partitioning tests. When tested under pre-partitioned conditions, water-soluble inhibitors may appear superior compared to those with lower partitioning coefficients. Therefore the relevance of the tests needed to be investigated to identify if a mitigation strategy could be identified as a result of a test methodology which may not reflect in-field conditions? And to what extent do the results correlate to those conducted using an oil phase. Three different oils were tested under six different conditions: CI-free Systems: 100%_brine, 80%_brine+20%_oil CI-treated Systems: 100%_Pre-Partitioned Brine(PP) 80%_PP-brine+20%_PP-oil, 80%_fresh-brine+20%_PP-oil, 80%_PP-brine+20%_fresh oil EIS measurements were taken at 1, 6, and 24 hours using a fixed CI concentration. A final test compared performance and residuals to better understand their relationship. The results question the field relevance of pre-partitioned conditions for CI selection and highlight the need for a standardized residual measurement method to ensure field-relevant testing.
