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51317--8806-Laboratory Testing of OCTG grades UNS N08028 and UNS N08029

Picture for Laboratory Testing of OCTG grades UNS N08028 and UNS N08029
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Laboratory testing program on the tube materials of UNS N08028 and UNS N08029 in 91000 mg/L chloride 1000 psi CO2 2200 psi H2S at temperature from 150 °C and up to 220 °C by means of tensile constant load per NACE TM0177 and slow stain rate testing (SSRT) per NACE TM0198.

Product Number: 51317--8806-SG
ISBN: 8806 2017 CP
Author: Wenle He
Publication Date: 2017
Industry: Materials Selection and Design
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$20.00
$20.00

Standard ISO 15156-3 (NACE standard MR0175) is essentially used for the material selection in H2S-containing environments when choosing cracking-resistant corrosion-resistant alloys (CRAs) in oil and gas production. Temperature and H2S partial pressure are considered as main parameters for materials selections. Laboratory testing is normally required for qualification of the materials by customer specifications. However earlier experiences indicated that UNS N08028 and UNS N08029 could withstand more severe environmental testing conditions compared to the standard required for type 4c alloys.Recently a laboratory testing program has been carried out on the tube materials of UNS N08028 and UNS N08029 in 91000 mg/L chloride 1000 psi CO2 2200 psi H2S at temperature from 150 °C and up to 220 °C by means of tensile constant load per NACE TM0177 and slow stain rate testing (SSRT) per NACE TM0198. Both UNS N08028 and UNS N08029 withstand the testing conditions. Pitting has been observed on these materials when chloride concentration was increased to 250000 mg/L after the constant load testing. Cracks have been observed in the SSRT when chloride was 254000 mg/L. The effects of chloride concentration and other possible parameters on the pitting and cracks have been discussed. UNS N08029 might have better crack resistance than UNS N08028 because its re-passivation property.

 

Key words: UNS N08028, UNS N08029, H2S, Chloride, Stress Corrosion Cracking (SCC), Downhole, OCTG

Standard ISO 15156-3 (NACE standard MR0175) is essentially used for the material selection in H2S-containing environments when choosing cracking-resistant corrosion-resistant alloys (CRAs) in oil and gas production. Temperature and H2S partial pressure are considered as main parameters for materials selections. Laboratory testing is normally required for qualification of the materials by customer specifications. However earlier experiences indicated that UNS N08028 and UNS N08029 could withstand more severe environmental testing conditions compared to the standard required for type 4c alloys.Recently a laboratory testing program has been carried out on the tube materials of UNS N08028 and UNS N08029 in 91000 mg/L chloride 1000 psi CO2 2200 psi H2S at temperature from 150 °C and up to 220 °C by means of tensile constant load per NACE TM0177 and slow stain rate testing (SSRT) per NACE TM0198. Both UNS N08028 and UNS N08029 withstand the testing conditions. Pitting has been observed on these materials when chloride concentration was increased to 250000 mg/L after the constant load testing. Cracks have been observed in the SSRT when chloride was 254000 mg/L. The effects of chloride concentration and other possible parameters on the pitting and cracks have been discussed. UNS N08029 might have better crack resistance than UNS N08028 because its re-passivation property.

 

Key words: UNS N08028, UNS N08029, H2S, Chloride, Stress Corrosion Cracking (SCC), Downhole, OCTG

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