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This paper describes the performance of film persistent corrosion inhibitors that are effective at fairly high temperatures and in systems that see large amounts of carbon dioxide (CO2). Use of batch treatment with the correct chemical, at the proper frequency resulted in substantial decrease in operating cost.
Corrosion Inhibition using batch treatment has been extensively used in North America. Batch treatment is attractive to use in North America as there are large numbers of wells and it is expensive to place pumps and capillary injection facilities in fields with large number of wells. Baker Hughes has developed a large set of film persistent corrosion inhibitors that are effective at fairly high temperatures and in systems that see large amounts of carbon dioxide. Wells that have large amounts of carbon dioxide are extremely corrosive and normally thought to require continuous injection of inhibitor in all circumstances. In this paper experimental results on the effectiveness of these corrosion inhibitors are presented. The field performance of the inhibitors in wells where the composition of carbon dioxide is as high as 95% will be presented. Use of batch treatment with the correct chemical at the proper frequency and mode of application resulted in substantial decrease in operating cost. The paper illustrates that extremely corrosive environments can be controlled with thoughtfully planned treatment using appropriate corrosion inhibitors.
Key words: corrosion inhibition, batch treatment, mild steel, CO2 corrosion, rod pumped wells
A forty foot well annulus simulator is used to determine the flow and fate of the applied chemical inhibitors for typical backside batch and flush application in a packerless completion. The delivery depends upon both chemical parameters such as density, viscosity, and surface tension as well as flush parameters including volume and rate.
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Recommended corrosion inhibitor (CI) testing methods and interpretation to assure proper execution of a test program. Associated guidance for CI test program definition testing and management to ensure and improve the integrity of carbon steels applications in our Industry.