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Enhanced Corrosion Prediction Model for Multiphase Oil and Gas Production Systems

A top-of-line corrosion (TLC) model integrated into a CO2/H2S corrosion prediction model. The TLC model determines the top of the line corrosion rate of carbon steel based on water chemistry and film-wise condensation rate. The effect of various glycols, such as Monoethylene Glycol, Diethylene glycol and Triethylene Glycol, are included.

Product Number: 51317--9419-SG
ISBN: 9419 2017 CP
Author: Hui Li
Publication Date: 2017
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In oil and gas production the potential damage to the oil and gas transportation lines caused by Top of the Line Corrosion (TLC) has become a key concern for pipeline operators given the inability of currently available prediction models to accurately capture the phase behavior and concomitant water condensation a precursor to TLC. Another concern with TLC is that continuous corrosion inhibitor application is usually not effective as TLC occurs in stratified flows where corrosion inhibitors can hardly reach corroding locations.This paper details a TLC model integrated into a CO2/H2S corrosion prediction model developed by the authors’ organization. The TLC model determines the Top of The Line corrosion rate of carbon steel based on iron concentration and film-wise condensation rate. The effect of various glycols such as Monoethylene Glycol (MEG) Diethylene glycol (DEG) and Triethylene Glycol (TEG) are included. Experimental data and field data were used for model validation and the predicted condensation rates and TLC rates demonstrated good agreement.

Keywords: corrosion rate, prediction, modeling, top of the line corrosion, oil and gas, pipelines

In oil and gas production the potential damage to the oil and gas transportation lines caused by Top of the Line Corrosion (TLC) has become a key concern for pipeline operators given the inability of currently available prediction models to accurately capture the phase behavior and concomitant water condensation a precursor to TLC. Another concern with TLC is that continuous corrosion inhibitor application is usually not effective as TLC occurs in stratified flows where corrosion inhibitors can hardly reach corroding locations.This paper details a TLC model integrated into a CO2/H2S corrosion prediction model developed by the authors’ organization. The TLC model determines the Top of The Line corrosion rate of carbon steel based on iron concentration and film-wise condensation rate. The effect of various glycols such as Monoethylene Glycol (MEG) Diethylene glycol (DEG) and Triethylene Glycol (TEG) are included. Experimental data and field data were used for model validation and the predicted condensation rates and TLC rates demonstrated good agreement.

Keywords: corrosion rate, prediction, modeling, top of the line corrosion, oil and gas, pipelines

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