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A multifaceted approach was used to address the corrosion inhibition program in Esso Resources Canada Limited's Redwater field. In the laboratory, inhibitor performance was measured by linear polarization and film persistency wheel tests. Both techniques produced similar inhibitor ranking, although the percent protection results were consistently higher for the linear polarization technique. In the field, corrosion rates were monitored by several devices. Metal loss measurements from flush strip electrical resistance probes best correlated to weight-loss coupons, although the instrument's calculated corrosion rates did not agree with the indicated metal loss. Inhibitor and tracer concentrations were monitored during batch-circulation well treatments to improve application efficiency. The concentration measurements showed that circulation time is the controlling factor in effectively batch-treating wells that have high annular fluid levels. The foregoing investigations, which provided vital information for corrosion control in a specific field, also point the way to improvements in corrosion inhibition technology.
inhibitors, linear polarization, wheel tests, corrosion monitoring, electrical resistance probes, inhibitor detection, batch-circulation treatments, circulation time
Senior research engineer, Esso Resources Canada Limited, Calgary, AB
Senior staff chemist, Exxon Chemical Co., Houston, TX