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97039 LIMITATIONS FOR THE APPLICATION OF 13CR STEEL IN OIL AND GAS Production ENVIRONMENTS

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Product Number: 51300-97039-SG
ISBN: 97039 1997 CP
Author: Sytze Huizinga, W. E. Liek
Industry: Oil and Gas Production
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A laboratory investigation of application limits of 13Cr steel was carried out for sweet downhole environments in the CO2 partial pressure regime up to about 10 bar (1 MPa). Two grades of 13Cr steel were stadied, one complying with the API 5CT specification and the other a higher carbon version. Polarisation curves, taken at various times after immersion of the specimens in simulated brine, revealed an increasing pitting tendency for the bigher chloride levels and indicated better performance for the API 5CT grade. This was in agreement with evidence for chromium depleted zones in the bigber carbon grade, obtained from polarisation curves in sulphuric acid. Weight loss exposure tests, in which the corrosion rate was also monitored by polarisation resistance measurements, were performed at temperatures of 100 and 125°C and supplemented with literature data to extend the temperature range. A mathematical formula was derived to describe the corrosion rate as a function of temperature and chloride content. For instance, if 0.1 mm/y is taken as an acceptable corrosion rate, 13Cr steel could be applied up to 125°C in the presence of 150 g/L Cl. In the exposure tests, the API 5CT 13Cr steel did not show pitting at the 0.1 mm/y boundary but the higher carbon grade did suffer from this form of attack. Kevwords: martensitic steel, 13Cr steel, UNS S42000, API 5CT, corrosion, CO2, brine, oil production, gas production, application limits
A laboratory investigation of application limits of 13Cr steel was carried out for sweet downhole environments in the CO2 partial pressure regime up to about 10 bar (1 MPa). Two grades of 13Cr steel were stadied, one complying with the API 5CT specification and the other a higher carbon version. Polarisation curves, taken at various times after immersion of the specimens in simulated brine, revealed an increasing pitting tendency for the bigher chloride levels and indicated better performance for the API 5CT grade. This was in agreement with evidence for chromium depleted zones in the bigber carbon grade, obtained from polarisation curves in sulphuric acid. Weight loss exposure tests, in which the corrosion rate was also monitored by polarisation resistance measurements, were performed at temperatures of 100 and 125°C and supplemented with literature data to extend the temperature range. A mathematical formula was derived to describe the corrosion rate as a function of temperature and chloride content. For instance, if 0.1 mm/y is taken as an acceptable corrosion rate, 13Cr steel could be applied up to 125°C in the presence of 150 g/L Cl. In the exposure tests, the API 5CT 13Cr steel did not show pitting at the 0.1 mm/y boundary but the higher carbon grade did suffer from this form of attack. Kevwords: martensitic steel, 13Cr steel, UNS S42000, API 5CT, corrosion, CO2, brine, oil production, gas production, application limits
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