Professional Review of Corrosion Inhibitor Performance Testing Protocols for Sour Service Production Systems in Deepwater Nigeria

Sour service production systems in deepwater Nigeria face corrosive environments combining H2S, CO2, organic acids, and high temperatures that demand rigorously qualified corrosion inhibitor packages to prevent material failures. This study professionally reviews the corrosion inhibitor performance testing protocols applicable to sour service production systems in deepwater Nigerian operations. The review covers laboratory test methods including rotating cage tests, jet impingement experiments, multiphase pipe flow loop tests, and high-pressure autoclave bubble tests, evaluating each method's ability to replicate the multiphase flow hydrodynamic conditions characteristic of deepwater production flowlines. Performance criteria including protective film efficiency, high-shear film persistence, and inhibitor compatibility with production chemicals such as scale inhibitors, biocides, and hydrate inhibitors are assessed against NACE TM0172 and EFC Publication 17 testing standards. Case studies from three deepwater Nigerian fields where inhibitor underperformance was attributed to testing protocol limitations are analysed, revealing that low-pressure laboratory tests systematically overpredict inhibitor efficiency by 15 to 25 percent under deepwater multiphase flow conditions. A revised testing hierarchy is proposed that mandates high-pressure multiphase flow loop qualification for inhibitor packages intended for flowlines operating at water depths exceeding 1,000 metres. Minimum dosage concentration, injection point selection, and carrier fluid compatibility requirements are specified within the revised protocol framework. Keywords: corrosion inhibitor, sour service, performance testing, deepwater Nigeria, multiphase flow.