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51312-01112-Corrosion Management of Lines with Comingled Produced Water and Sea Water

Picture for Corrosion Management of Lines with Comingled Produced Water and Sea Water
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Product Number: 51312-01112-SG
ISBN: 01112 2012 CP
Author: L. Christopher Dash
Publication Date: 2012
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$20.00
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To enhance asset capacity utilization and operational flexibility produced water (PW) and sea water (SW) were comingled for several years as part of water flooding large Alaskan oil fields. Comingling led to severe corrosion and the functional loss of several pipelines. Detailed investigations revealed that inorganic scale solids low velocities lack of supplemental corrosion inhibition maintenance pigging ineffectiveness and bacteria were principal factors that resulted in the lack of adequate corrosion control. A rigorous management of change process and aggressive corrosion mitigation efforts were implemented to separate PW & SW. Lessons learned from the above experiences were also applied to temporary PW-SW comingling efforts necessitated by business/operational constraints as well as emergency situations leading to inadvertent mixing of PW and SW. While technically successful the latter efforts highlighted the risks associated with comingling PW & SW in water flood applications. This paper also discusses the need for asset integrity issues to be effectively communicated through the management chain for common understanding and acceptance of risks and challenges associated with comingled injection waters.
To enhance asset capacity utilization and operational flexibility produced water (PW) and sea water (SW) were comingled for several years as part of water flooding large Alaskan oil fields. Comingling led to severe corrosion and the functional loss of several pipelines. Detailed investigations revealed that inorganic scale solids low velocities lack of supplemental corrosion inhibition maintenance pigging ineffectiveness and bacteria were principal factors that resulted in the lack of adequate corrosion control. A rigorous management of change process and aggressive corrosion mitigation efforts were implemented to separate PW & SW. Lessons learned from the above experiences were also applied to temporary PW-SW comingling efforts necessitated by business/operational constraints as well as emergency situations leading to inadvertent mixing of PW and SW. While technically successful the latter efforts highlighted the risks associated with comingling PW & SW in water flood applications. This paper also discusses the need for asset integrity issues to be effectively communicated through the management chain for common understanding and acceptance of risks and challenges associated with comingled injection waters.
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