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08539 Predicting Galvanic CO2 Corrosion in Oil and Gas Production Systems

Picture for 08539 Predicting Galvanic CO2 Corrosion in Oil and Gas Production Systems
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Product Number: 51300-08539-SG
ISBN: 08539 2008 CP
Author: Jose R. Vera, Sandra Hernandez, Colin Scott, and Oliver Moghissi
Publication Date: 2008
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Some oil and gas production systems have critical components (e.g. manifolds, tees, bends, valves) made out of or internally clad with corrosion resistant alloys for protecting against specific degradation mechanisms. In this work, finite element analyses and potentiodynamic curves generated with a mechanistic CO2 corrosion model were used to quantify the threat of galvanically enhanced corrosion on different carbon steel components partially clad with Alloy 625. Under the conditions evaluated, uninhibited corrosion rates of carbon steel piping were shown to nearly double near the Alloy 625 interface. The galvanic currents were shown to decrease exponentially with the distance from the carbon steel–Alloy 625 interface, reaching negligible values after 1.5 times the internal diameter.
Some oil and gas production systems have critical components (e.g. manifolds, tees, bends, valves) made out of or internally clad with corrosion resistant alloys for protecting against specific degradation mechanisms. In this work, finite element analyses and potentiodynamic curves generated with a mechanistic CO2 corrosion model were used to quantify the threat of galvanically enhanced corrosion on different carbon steel components partially clad with Alloy 625. Under the conditions evaluated, uninhibited corrosion rates of carbon steel piping were shown to nearly double near the Alloy 625 interface. The galvanic currents were shown to decrease exponentially with the distance from the carbon steel–Alloy 625 interface, reaching negligible values after 1.5 times the internal diameter.
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