A Case Study on Inner Corrosion of 3%Cr Casing Steel in the CO2 Environments

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Understanding inner corrosion property of casing steel is fundamental to safe and economic exploitation of oil & gas. In this present work, a series of corrosion tests were conducted on 3%Cr coupons derived from 9-5/8” casing. Analyses of weight loss, product morphology and composition were carried out, to investigate the corrosion behaviors caused by sweet CO2. Analysis on the weight loss showed that, with an increment of temperature from 45°C to 105°C, the corrosion rate of 3%Cr coupon firstly ascends and then arrives to the maximum at 65°C. SEM analysis demonstrated the formation of a compact corrosion product layer on the specimen surface. While increasing the exposed time increases, the corrosion rate gradually descends. The main compositions of corrosion product are Fe-Cr and Cr5O12, which can effective hinder corrosion reaction in the CO2 environment.

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38-42

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October 2017

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© 2017 Trans Tech Publications Ltd. All Rights Reserved

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