Carbon Dioxide Induced Corrosion of Carbon Steel X65 Exposed to Nitrite Aqueous Solutions
- Silvia M. Vargas (BP) | Richard Woollam (BP) | William Durnie (BP) | Michael Hodges (BP)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- August 2018
- Document Type
- Journal Paper
- 2018.Society of Petroleum Engineers
- Vanadium (III), RCE, Nitrate, Nitrite, CO2 corrosion
- 4 in the last 30 days
- 104 since 2007
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Nitrate used to control reservoir souring in oil fields contains nitrite impurities. Nitrite is a strong oxidizer, and when used in souring-treatment fluids, the flow path often includes carbon-steel piping. Vanadium, also an oxidizer, is at times found in oilfield-production streams that commingle with souring-treatment fluids. The interactions between nitrite and vanadium and their effects on carbon steel X65 corrosion were investigated.
The effect of nitrite on corrosion was investigated using synthetic brine to simulate produced water [rich in carbon dioxide (CO2), pH value of approximately 5] and seawater (negligible CO2, pH value of approximately 7). Tests were conducted with carbon steel X65 exposed to synthetic brine at 25, 60, and 80°C using a rotating cylinder electrode (RCE). The test results demonstrate the following:
- The corrosivity of nitrite strongly depends on the pH level.
- Nitrite increases corrosion at pH of approximately 5 and is relatively benign at pH of approximately 7.
- Nitrite reduces to ammonium(thermodynamically stable in acid solutions),whereas vanadium(III) delays the formation of ammonium.
- Inhibited corrosion tests indicate that nitrite reduces the performance of the studied commercial corrosion inhibitors (CIs).
|File Size||1 MB||Number of Pages||13|
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