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51313-02233-Development Evaluation and Field Performance of Combined Corrosion Inhibitor

Product Number: 51313-02233-SG
ISBN: 02233 2013 CP
Author: Qiang Liu
Publication Date: 2013
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Abstract
Corrosion occurs in oil and gas gathering lines containing high H2S and/or CO2. In the presence of the scale and bacteria corrosion can be aggravated. A combined corrosion inhibitor (CCI-2) is developed which provides corrosion/scale inhibition and mitigates microbially induced corrosion. A scale inhibitor with great performance and tolerance to high calcium cation is incorporated in CCI-2.
Autoclave test is conducted using synthetic brine of medium total dissolved solids with a gas phase of 520 kPa H2S 350 kPa CO2 and 735 kPa N2. CCI-2 reduces corrosion rate by 96%. Biocide test shows that CCI-2 can kill acid producing bacteria (APB).
CCI-2 is successfully applied in the field gas lines with high content of CO2 and H2S. The brine contains bacteria and has 12% of total dissolved solids with high scale tendency. The bacteria residual CCI-2 iron and manganese in the field brine are periodically monitored. When the residual CCI-2 is above critical micelle concentration CCI-2 performs very well in corrosion mitigation scale inhibition and contribution to bacteria killing.

Key words: combined corrosion inhibitor scale corrosion protection critical micelle concentration sour gas auto clave test
 

Abstract
Corrosion occurs in oil and gas gathering lines containing high H2S and/or CO2. In the presence of the scale and bacteria corrosion can be aggravated. A combined corrosion inhibitor (CCI-2) is developed which provides corrosion/scale inhibition and mitigates microbially induced corrosion. A scale inhibitor with great performance and tolerance to high calcium cation is incorporated in CCI-2.
Autoclave test is conducted using synthetic brine of medium total dissolved solids with a gas phase of 520 kPa H2S 350 kPa CO2 and 735 kPa N2. CCI-2 reduces corrosion rate by 96%. Biocide test shows that CCI-2 can kill acid producing bacteria (APB).
CCI-2 is successfully applied in the field gas lines with high content of CO2 and H2S. The brine contains bacteria and has 12% of total dissolved solids with high scale tendency. The bacteria residual CCI-2 iron and manganese in the field brine are periodically monitored. When the residual CCI-2 is above critical micelle concentration CCI-2 performs very well in corrosion mitigation scale inhibition and contribution to bacteria killing.

Key words: combined corrosion inhibitor scale corrosion protection critical micelle concentration sour gas auto clave test
 

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