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51313-02610-High Temperature Testing of Corrosion Inhibitor Performance

Picture for High Temperature Testing of Corrosion Inhibitor Performance
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Product Number: 51313-02610-SG
ISBN: 02610 2013 CP
Author: Iozsef Palencsar
Publication Date: 2013
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Corrosion inhibition as the choice for mitigating corrosion of carbon steel in oil and gas production is increasingly difficult for fields with high temperature conditions. In addition laboratory testing of intrinsic inhibitor performance at high temperatures is a challenge in itself. Efforts aimed at both improving evaluation methodology and generating experimental data are therefore valuable. Within the framework of a Joint Industry Project the authors addressed issues highly relevant from this perspective such as inhibitor performance mechanistic aspects and test methodology development.

This contribution presents some of the most important findings from this project. The majority of the experimental work was performed in jet impingement loops built specially to operate at temperatures up to 150 °C using generic model inhibitors (oleic imidazoline and cocoalkyl quat) at 1 bar CO2 partial pressure in low salinity brine (3 g/l NaCl pH 4).

The results proved that the jet impingement setup is well suited for studying intrinsic inhibitor performance at high temperatures; enhanced mass transport is essential in preventing substantial amounts of FeCO3 to form on the specimen surfaces.

Significant inhibitor efficiency was still evident up to 150 °C although corrosion rates below 1 mm/y at this temperature could not be obtained.

The presence of small amounts of oil had a significant impact on the inhibited corrosion rate yielding in some cases a further decrease of the corrosion rates of one order of magnitude or more.
 

Corrosion inhibition as the choice for mitigating corrosion of carbon steel in oil and gas production is increasingly difficult for fields with high temperature conditions. In addition laboratory testing of intrinsic inhibitor performance at high temperatures is a challenge in itself. Efforts aimed at both improving evaluation methodology and generating experimental data are therefore valuable. Within the framework of a Joint Industry Project the authors addressed issues highly relevant from this perspective such as inhibitor performance mechanistic aspects and test methodology development.

This contribution presents some of the most important findings from this project. The majority of the experimental work was performed in jet impingement loops built specially to operate at temperatures up to 150 °C using generic model inhibitors (oleic imidazoline and cocoalkyl quat) at 1 bar CO2 partial pressure in low salinity brine (3 g/l NaCl pH 4).

The results proved that the jet impingement setup is well suited for studying intrinsic inhibitor performance at high temperatures; enhanced mass transport is essential in preventing substantial amounts of FeCO3 to form on the specimen surfaces.

Significant inhibitor efficiency was still evident up to 150 °C although corrosion rates below 1 mm/y at this temperature could not be obtained.

The presence of small amounts of oil had a significant impact on the inhibited corrosion rate yielding in some cases a further decrease of the corrosion rates of one order of magnitude or more.
 

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