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Amberjack (MC109A) – A Study of Preferential Weld Corrosion in Produced Water with High Organic Acids and Low Partial Pressure CO2

As a result of an internal corrosion weld leak on the low pressure header that resulted in a facility shut-in at MC109A an investigation was conducted to determine the cause of the failure and the subsequent mitigation practices going forward. The header was only in service for 3.5 years having been replaced in early January 2014 as a result of an internal weld failure on the original header log (> 20 years of service). One well the A16 was identified not only as a large water producer accounting for roughly 20% of the produced water at MC109A but also contained elevated concentrations of acetate (> 2000 mg/l). Weld comparisons of the original header weld metal vs. the newly failed header weld metal showed differences in chemical compositions. Laboratory and field coupons were created from sections of the newly failed header containing intact welds and studied to determine the effect of the elevated organic acid concentration on these weld specimens representative of those that failed within the system.

Product Number: 51319-13110-SG
Author: Jared Hebert
Publication Date: 2019
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