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Shop through fluesystems. Take action now! Enjoy big savings at fluesystems. Don't miss out. For the injection wellbore, the flue gas should not be coinjected with water with a high salt concentration to decrease the corrosion rate of flue gas on the downhole string. The corrosion of metals starts on the substrate surface, and the substrate surface shows a different state after corrosion with different mediums.
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The composition of the corrosion product for N80 under different gas conditions was analyzed by XRD, and the experimental results are shown in Table 2. Experiment No. A complete corrosion product film formed on the coupon surface. Experiments No. The brown corrosion products are uniformly distributed on the surface of the coupon, and the area with no corrosion products is a matrix surface of Fe. The corrosion products analyzed by XRD demonstrated that the coupon surface can form a layer of corrosion product film under some corrosion conditions, inhibiting further corrosion on the metal surface.
The effect of corrosion product film on the corrosion rate is related to the integrity and stability of the film. There are many factors that affect the formation of a corrosion product film, including the coupon properties and corrosion environment.
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The formation of FeCO 3 film depends on thermodynamic conditions on the coupon surface. The corrosion may be inhibited by the formation of FeCO 3 film because it reduces the contact of CO 2 and the coupon surface.
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However, incomplete corrosion product film may accelerate the electrochemical corrosion, resulting in severe pitting. Figure 13 B displays the SEM analysis of the coupon surface after removing the corrosion product film. The originally smooth surface with a metallic luster becomes rough with small local pits under the corrosion condition of CO 2 , but the surface is relatively flat. The reason for this result is that the corrosion product film of FeCO 3 has a certain protective effect and reduces the corrosion rate.
The local small pits may be caused by the incompleteness of the film. The coupon surface is uneven with strip corrosion grooves. The Fe 3 C is a result of the anodic dissolution of Fe in the corrosion process.
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The Fe 3 C is crisp and loose with holes. The Fe 3 C product progresses the corrosion rate by galvanic corrosion and local acidification mechanisms. It shows characteristics of mesa attack corrosion, which results in a local platform form of corrosion on the coupon surface. The mesa attack corrosion can be caused by an unstable FeCO 3 film or turbulent erosion. The small amounts of O 2 and SO 2 can accelerate the corrosion of the downhole string under flue gas injection conditions considerably. If the relative humidity of the flue gas is lower than 0.
The corrosion is almost acceptable.
If the conditions are worse, some corrosion inhibitor is needed to reduce the corrosion rate and protect the downhole string. Under the corrosion environment of the gas phase, the corrosion rates of X70, P, and N80 increase notably with temperature and O 2 concentration. The injection parameters should be optimized to reduce the flue gas corrosion of the downhole string. The relative humidity of the flue gas should be lower than 0. The excess air coefficient of the boiler should be kept at a reasonable value to reduce the O 2 content in the flue gas.
The flue gas should not be coinjected into wellbores with brine. Steels with higher Cr content can be used for the downhole string. The full text of this article hosted at iucr. If you do not receive an email within 10 minutes, your email address may not be registered, and you may need to create a new Wiley Online Library account.
If the address matches an existing account you will receive an email with instructions to retrieve your username. Songyan Li Corresponding Author E-mail address: lsyupc Tools Request permission Export citation Add to favorites Track citation. Share Give access Share full text access. Share full text access. Please review our Terms and Conditions of Use and check box below to share full-text version of article. Abstract Flue gas collection from steam generators and its utilization in enhanced oil recovery EOR can reduce CO 2 emissions into the atmosphere and improve oil recovery efficiency.
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