A Combination of Laboratory Testing, RCE, and Corrosion Loop for Inhibitor Selection

Corrosion inhibitors are evaluated in the oil industry with electrochemical tests of resistance to linear polarization rotating cylinders following ASTM G170 and NACE 3T199 standards. With these tests, we can determine corrosion rate (CR) efficiency inhibitors. In this work, a test protocol used by hydrocarbon-producing companies for testing was used. This consists 1045 carbon steel working electrode solution composed 9.62% NaCl, 0.45% CaCl2, 0.19% MgCl2, 89.74% H2O, at temperature 65 °C saturated CO2. Each inhibitor tested subjected series 6000-4000-2000-4000-6000 rpm using cylinder electrodes (RCEs). These studies were carried out evaluate ability prevent presence centrifugal force. our opinion, does not provide engineers enough information be as predictive tool, since what is obtained CR very short time. document proposes use two more appropriate methodologies, (RCE) flow loop (FL), performance inhibitor. For FL, selected 1.2 m/s, same that fluids have company pipelines installed Neuquén, Argentina. Firstly, according company’s protocol, required an greater than or equal 90% RCE tests; therefore, meet requirements FL test. Unlike test, represents experimental conditions laboratory closest reality, evaluation gas industry. several problems involving corrosion, erosion, abrasion, biphasic fluids, time it takes become effective, duration its effectiveness.