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Corrosion In Confined Environments - The Importance Of High Supersaturation Of Dissolved Corrosion Products

Corrosion in Confined Environments - The Importance of High Supersaturation of Dissolved Corrosion Products
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The paper discusses how SRFeCO3 affects the stability of the corrosion product films and how SRFeCO3 can be used to estimate the equilibrium pressure of H2S in the annulus. 

Product Number: 51322-18025-SG
Author: Arne Dugstad, Simona Palencsár
Publication Date: 2022
Industry: Corrosion Monitoring and Control
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Flexible pipes used in oil and gas production are composed of densely packed steel wires enclosed in an annulus confined by inner and outer thermoplastic sheaths. Hydrocarbons, water, CO2, and H2S from the bore permeate through the thermoplastic sheaths and form a corrosive environment in the confined space between the sheaths. Generally, low corrosion rates (<0.01 mm/y) are experienced. This is attributed to the low water volume to steel surface ratio (V/S ratio) causing rapid accumulation of dissolved corrosion products and precipitation of protective corrosion product films.

The relationship between the supersaturation of dissolved FeCO3 (SRFeCO3), the precipitation rate of FeCO3, and the protective properties of the precipitated corrosion product film was studied in a series of experiments performed at different V/S ratios and different temperatures (10 °C, 25 °C and 60 °C). The experiments showed a large effect of temperature and duration of exposure. 

Flexible pipes used in oil and gas production are composed of densely packed steel wires enclosed in an annulus confined by inner and outer thermoplastic sheaths. Hydrocarbons, water, CO2, and H2S from the bore permeate through the thermoplastic sheaths and form a corrosive environment in the confined space between the sheaths. Generally, low corrosion rates (<0.01 mm/y) are experienced. This is attributed to the low water volume to steel surface ratio (V/S ratio) causing rapid accumulation of dissolved corrosion products and precipitation of protective corrosion product films.

The relationship between the supersaturation of dissolved FeCO3 (SRFeCO3), the precipitation rate of FeCO3, and the protective properties of the precipitated corrosion product film was studied in a series of experiments performed at different V/S ratios and different temperatures (10 °C, 25 °C and 60 °C). The experiments showed a large effect of temperature and duration of exposure. 

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