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09240 A Novel Approach to Determine the Overall Performance of a Corrosion Inhibitor in a Laboratory Testing Program

Picture for 09240 A Novel Approach to Determine the Overall Performance of a Corrosion Inhibitor in a Laboratory
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Product Number: 51300-09240-SG
ISBN: 09240 2009 CP
Author: David Blumer and Mohsen H. Achour
Publication Date: 2009
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This study consists of introducing a new method that may be used to globally quantify the performance of a corrosion inhibitor in a laboratory testing program. For a given corrosion inhibitor, the new concept introduces and defines a single indicator called the Global Performance Index (GPI) that simultaneously takes into account all the corrosion rate measurements from the various techniques applied in the lab in order to assess the performance of the inhibitor for a given application. The index is dimensionless, ranges between 0 and 1 and can account for both general and pitting corrosion rates in a systematic fashion. It also lumps the performances of the inhibitor as reported by all the laboratory test methods, which are usually chosen as a function of the field conditions and the nature of the production system. The new method is illustrated in the case of a corrosion inhibitor selection program for a wet gas transport line and an oil export line. It is particularly recommended that the proposed GPI is to be used in comparing and ranking a given set of corrosion inhibitors for a production system of interest. It can also be utilized to assess the performance sensitivity of a chosen corrosion inhibitor as a function of the variability of the operating field conditions. The method can be extended to evaluate the overall performance of any other non produced chemical, such as scale inhibitors, biocides or wax inhibitors in laboratory testing.

Key words: corrosion inhibitor, laboratory testing, performance, GPI, pitting, corrosion
This study consists of introducing a new method that may be used to globally quantify the performance of a corrosion inhibitor in a laboratory testing program. For a given corrosion inhibitor, the new concept introduces and defines a single indicator called the Global Performance Index (GPI) that simultaneously takes into account all the corrosion rate measurements from the various techniques applied in the lab in order to assess the performance of the inhibitor for a given application. The index is dimensionless, ranges between 0 and 1 and can account for both general and pitting corrosion rates in a systematic fashion. It also lumps the performances of the inhibitor as reported by all the laboratory test methods, which are usually chosen as a function of the field conditions and the nature of the production system. The new method is illustrated in the case of a corrosion inhibitor selection program for a wet gas transport line and an oil export line. It is particularly recommended that the proposed GPI is to be used in comparing and ranking a given set of corrosion inhibitors for a production system of interest. It can also be utilized to assess the performance sensitivity of a chosen corrosion inhibitor as a function of the variability of the operating field conditions. The method can be extended to evaluate the overall performance of any other non produced chemical, such as scale inhibitors, biocides or wax inhibitors in laboratory testing.

Key words: corrosion inhibitor, laboratory testing, performance, GPI, pitting, corrosion
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