51312-01198-Galvanic Probes: A Versatile Monitoring Technique to Detect Oxygen Ingress pH Excursions and Other

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Product Number: 51312-01198-SG

ISBN: 01198 2012 CP

Author: Wellington Wamburi

Publication Date: 2012

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Abstract Galvanic Probes: A Versatile Monitoring Technique to Detect Oxygen Ingress pH Excursions and Other Events in Laboratory and Field Applications Josef Bojes John Lerbscher Wellington Wamburi Baker Hughes Calgary Alberta Canada Oxygen ingress into process streams constructed from mild steel causes general and pitting corrosion rates to increase. Air ingress is often an intermittent event and real-time continuous monitoring for oxygen is required to help identify events where air ingress occurs. Gas chromatographic methods have been successfully used to detect oxygen in gas streams in the field; however such methods are often too costly or impractical for most field applications. Galvanic probes are robust cost effective and are particularly useful in detecting low levels of dissolved oxygen in aqueous?based liquid streams. This paper incorporates two sets of data. Part one reveals data taken under controlled laboratory conditions to gain an understanding of what the probe will respond to. The second part discusses field data from two field locations where air ingress and/or pH excursions occurred. When galvanic probe data is coupled with a thorough understanding of a given system to make useful conclusions this tool provides oilfield operators with a valuable technique to manage asset integrity against oxygen corrosion.