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51315-5842-Electrochemical Tests in Completion Fluid Environment in Martensitic Stainless Steels Used in Oil and Gas Wells

Picture for Electrochemical Tests in Completion Fluid Environment in Martensitic Stainless Steels Used in Oil an
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Product Number: 51315-5842-SG
ISBN: 5842 2015 CP
Author: Elaine Nascimento
Publication Date: 2015
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CO2 is known as an acid gas and it is commonly found in oil and gas production or gas lift injection used to transport oil to the surface. During the gas injection phase the CO2 gas in contact with completion fluid promotes the decreasing of the media pH value. This acidizing promotes a more corrosive environment for martensitic steels used in oil and gas wells such as low alloy steel 1%Cr martensitic stainless steel 13%Cr and supermartensitic stainless steel S13%Cr.Electrochemical tests were carried out in static conditions to verify the behavior of martensitic steels in completion fluid saturated with CO2 and without CO2 at room temperature and at 60°C.Gravimetric tests were carried under static conditions in an autoclave at 50 psi partial pressure of CO2 and 60°C for low alloy steel 1%Cr martensitic stainless steel 13%Cr and supermartensitic stainless steel SCr13%.According to Anodic Polarization Curves low alloy Steel 1%Cr presented active dissolution in all tested conditions. Stainless steel 13%Cr and S13%Cr presented passive behavior nearby open circuit potential for both temperatures.Oxygen is an aggressive agent and its presence in the fluid tested change the behavior of anodic polarization curves for martensitic steels.The obtained results indicated that the supermartensitic stainless steel S13%Cr presented higher corrosion resistance than 1%Cr and 13%Cr steels all materials tested in the completion fluid presenting severe uniform corrosion and localized corrosion for low alloy steel.

CO2 is known as an acid gas and it is commonly found in oil and gas production or gas lift injection used to transport oil to the surface. During the gas injection phase the CO2 gas in contact with completion fluid promotes the decreasing of the media pH value. This acidizing promotes a more corrosive environment for martensitic steels used in oil and gas wells such as low alloy steel 1%Cr martensitic stainless steel 13%Cr and supermartensitic stainless steel S13%Cr.Electrochemical tests were carried out in static conditions to verify the behavior of martensitic steels in completion fluid saturated with CO2 and without CO2 at room temperature and at 60°C.Gravimetric tests were carried under static conditions in an autoclave at 50 psi partial pressure of CO2 and 60°C for low alloy steel 1%Cr martensitic stainless steel 13%Cr and supermartensitic stainless steel SCr13%.According to Anodic Polarization Curves low alloy Steel 1%Cr presented active dissolution in all tested conditions. Stainless steel 13%Cr and S13%Cr presented passive behavior nearby open circuit potential for both temperatures.Oxygen is an aggressive agent and its presence in the fluid tested change the behavior of anodic polarization curves for martensitic steels.The obtained results indicated that the supermartensitic stainless steel S13%Cr presented higher corrosion resistance than 1%Cr and 13%Cr steels all materials tested in the completion fluid presenting severe uniform corrosion and localized corrosion for low alloy steel.

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