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Carbon Steel Corrosion On Production Environment, Evaluating The Impact Of CO2 Partial Pressure, BSW And Oil Characteristics On Tubular Life Extend

Picture for Carbon Steel Corrosion On Production Environment, Evaluating The Impact Of CO2 Partial Pressure, BSW And Oil Characteristics On Tubular Life Extend
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Product Number: 51321-16868-SG
Author: Merlin C. E. Bandeira; Rogaciano M. Moreira; Felipe S. Assunção; Oscar R. Mattos; Gustavo L. Vaz; Jefferson R. Oliveira; Ilson Palmieri; Bruno Diehl Neto
Publication Date: 2021
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The high productivity of pre-salt exploratory wells led to a re-evaluation of Petrobras' model of offshore
oil production and exploration. We present here the study that allowed the conversion of exploratory
wells into producers, based on the corrosion resistance of carbon steel in different scenarios of pre-salt
field production. The aim of the test program was to evaluate the influence of the produced water
content (BSW), CO2 partial pressure and oil characteristics on the carbon steel corrosion resistance.
General corrosion analysis showed that for brine content below 40% corrosion rates ca. 0.05 mm/year
for 28-day tests. Higher CO2 partial pressure did not lead to increased corrosiveness, unlike shear
stress. There was localized corrosion in most of the evaluated test conditions, confirming the
importance of using laboratory techniques that allow such analysis. Localized as well as generalized
corrosion kinetics decrease over time, confirming that laboratory tests, even when replicating field
conditions, are more conservative as the operation time of the production columns will be extremely
longer than laboratory test times. Based on results of this test program it was possible to extend the
operation of exploratory wells adopting as safety criteria for well abandonment the produced water
content (i.e. BS&W content) and additionally monitoring the internal pressure of production tubing.

The high productivity of pre-salt exploratory wells led to a re-evaluation of Petrobras' model of offshore
oil production and exploration. We present here the study that allowed the conversion of exploratory
wells into producers, based on the corrosion resistance of carbon steel in different scenarios of pre-salt
field production. The aim of the test program was to evaluate the influence of the produced water
content (BSW), CO2 partial pressure and oil characteristics on the carbon steel corrosion resistance.
General corrosion analysis showed that for brine content below 40% corrosion rates ca. 0.05 mm/year
for 28-day tests. Higher CO2 partial pressure did not lead to increased corrosiveness, unlike shear
stress. There was localized corrosion in most of the evaluated test conditions, confirming the
importance of using laboratory techniques that allow such analysis. Localized as well as generalized
corrosion kinetics decrease over time, confirming that laboratory tests, even when replicating field
conditions, are more conservative as the operation time of the production columns will be extremely
longer than laboratory test times. Based on results of this test program it was possible to extend the
operation of exploratory wells adopting as safety criteria for well abandonment the produced water
content (i.e. BS&W content) and additionally monitoring the internal pressure of production tubing.

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