Evaluation of corrosion inhibitor film persistency by electrochemical impedance spectroscopy (EIS)

Book · Thu Aug 01 04:00:00 EDT 1996

OSTI ID:271987

Chen, H J ^[1]

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1. Chevron Petroleum Technology Co., La Habra, CA (United States)

Film persistency of commercially available oilfield corrosion inhibitors has been evaluated in CO{sub 2}-saturated 5% sodium chloride solution using electrochemical impedance spectroscopy (EIS). The effect of inhibitor concentration and contact time on inhibitor film persistency was also investigated. This study demonstrates that EIS is a feasible method for evaluating and ranking inhibitor film persistency and can be used to monitor inhibitor film life. EIS can provide the corrosion rate and characteristics of the inhibited film and generate the parameters related to the specific inhibitor film. It was found that there is an excellent correlation between an EIS parameter, namely the high breakpoint frequency at a 45{degree} phase angle and inhibitor film persistency. The identification of this correlation, for which Chevron has been granted a patent, is significant because there are advantages associated with measuring this parameter. This discovery enables EIS to be used in the field to monitor and optimize corrosion inhibition programs, thus reducing the chemical and operation costs.

• OSTI ID: 271987
• Report Number(s): CONF-960389--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
36 MATERIALS SCIENCE
CARBON DIOXIDE
CARBON STEELS
CORROSION INHIBITORS
CORROSION PROTECTION
ELECTRIC IMPEDANCE
EXPERIMENTAL DATA
FIELD PRODUCTION EQUIPMENT
MEASURING METHODS
MONITORING
OIL WELLS
PERFORMANCE TESTING
RELIABILITY
SODIUM CHLORIDES
SPECTROSCOPY