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51318-11450-EVALUATION OF THE STRESS CORROSION CRACKING OF DIFFERENT CRAS IN SOUR WELL ENVIRONMENT.

Picture for EVALUATION OF THE STRESS CORROSION CRACKING OF DIFFERENT CRAS IN SOUR WELL ENVIRONMENT.
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This paper shows the results of the stress corrosion cracking evaluation of two different austenitic corrosion resistant alloys (CRAs), N08028 and N08825 under different conditions of temperature and pressure of H2S and CO2.

Product Number: 51318-11450-SG
Author: P.Esteban / Alejandra López / B.Calleja
Publication Date: 2018
Industry: Oil and Gas Production
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$20.00
$20.00

In selecting materials for corrosive sour oil field environments, the materials of choice must be reliable and cost-effective. Materials have to meet criteria for both corrosion resistance and mechanical properties in sour environments for the required service life. This paper shows the results of the stress corrosion cracking evaluation of two different austenitic corrosion resistant alloys (CRAs), N08028 and N08825 under different conditions of temperature and pressure of H2S and CO2. Those testing conditions are demanded by several end users with oil and natural gas wells operating in different zones onshore and offshore. Depending on the well location the severe environment varies. Corrosion data are presented showing the performance of each grade using the slow strain rate according to NACE TM0198, the NACE TM0177 method A and the NACE TM0316.1-3 Both cold worked materials are typically specified as type 4c and are approved by the NACE MR0175 up to a hardness level of 40 HRC and a maximum yield strength of 150 ksi.

Key words: stress corrosion cracking (SCC), well conditions, corrosion resistant alloys, oil country tubular goods, N08028, N08825

In selecting materials for corrosive sour oil field environments, the materials of choice must be reliable and cost-effective. Materials have to meet criteria for both corrosion resistance and mechanical properties in sour environments for the required service life. This paper shows the results of the stress corrosion cracking evaluation of two different austenitic corrosion resistant alloys (CRAs), N08028 and N08825 under different conditions of temperature and pressure of H2S and CO2. Those testing conditions are demanded by several end users with oil and natural gas wells operating in different zones onshore and offshore. Depending on the well location the severe environment varies. Corrosion data are presented showing the performance of each grade using the slow strain rate according to NACE TM0198, the NACE TM0177 method A and the NACE TM0316.1-3 Both cold worked materials are typically specified as type 4c and are approved by the NACE MR0175 up to a hardness level of 40 HRC and a maximum yield strength of 150 ksi.

Key words: stress corrosion cracking (SCC), well conditions, corrosion resistant alloys, oil country tubular goods, N08028, N08825

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A series of experiments was conducted in a large-scale multi-phase flow loop to investigate the threshold level of H2S leading to localized attack on mild steel in CO2 saturated aqueous solution with 1%wt NaCl at 40°C.
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