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Lab Performance Testing on Corrosion Inhibitors Under Supercritical Carbon Dioxide Conditions

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This paper discusses the design philosophy for corrosion inhibitors used for carbon capture, transportation, and storage and the performance testing using rotating cylinder autoclave (RCA) and electrochemical impedance spectroscopy (EIS) methods under CO2 supercritical conditions.

Product Number: 51317--9474-SG
ISBN: 9474 2017 CP
Author: Larry Chen
Publication Date: 2017
Industry: Chemical Inhibitors
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Larry Chen Nihal Obeyesekere Jonathan WyldeClariant Corporation Oil and Mining Services2750 Technology Forest Blvd.The Woodlands TX 77381For the foreseeable future fossil fuels will continue to be the dominant source of the world’s primary energy production. There has been growing concern that the use of the carbon-based fuels produces greenhouse gases principally carbon dioxide (CO2) which may adversely affect the global climate and environment. One way to mitigate the problem is to use carbon capture transportation and storage (CCTS) techniques and systems. As such there is an increasing demand on corrosion inhibitors for CCTS application and also a need to understand the corrosion inhibitor performance under CCTS operating conditions.In general the CO2 is required to be transported above its critical point (30.98 oC 73.77 bar) as single phase in the system which is a pre-condition for continuous operation at the so-called quasi-steady (QSSA) state. Therefore like most of the corrosion inhibitors performing on their unique functionalities such as for applications of downhole HPHT sweet and sour continue and batch water or oil soluble UDC or TOL etc. the corrosion inhibitors for CCTS applications need to be specially formulated and evaluated under supercritical conditions of CO2.This study presents several testing procedures pursued in the lab under supercritical conditions of CO2 with or without impurities such as water SO2 and H2S. The corrosion rates to be calculated under different testing conditions were direct weight loss of metal coupons and the measurements of the corrosion current corrosion potential polarization resistance with electrochemical instruments. Based on these preliminary experiments the preferred experimental procedures have been suggested.Keywords: CCTS CCS supercritical condition CO2 corrosion inhibitors corrosion testing electrochemical RCA

Keywords: CCTS, CCS, supercritical condition, CO2, corrosion inhibitors, corrosion testing, electrochemical, RCA, EIS, AC Impedance

Larry Chen Nihal Obeyesekere Jonathan WyldeClariant Corporation Oil and Mining Services2750 Technology Forest Blvd.The Woodlands TX 77381For the foreseeable future fossil fuels will continue to be the dominant source of the world’s primary energy production. There has been growing concern that the use of the carbon-based fuels produces greenhouse gases principally carbon dioxide (CO2) which may adversely affect the global climate and environment. One way to mitigate the problem is to use carbon capture transportation and storage (CCTS) techniques and systems. As such there is an increasing demand on corrosion inhibitors for CCTS application and also a need to understand the corrosion inhibitor performance under CCTS operating conditions.In general the CO2 is required to be transported above its critical point (30.98 oC 73.77 bar) as single phase in the system which is a pre-condition for continuous operation at the so-called quasi-steady (QSSA) state. Therefore like most of the corrosion inhibitors performing on their unique functionalities such as for applications of downhole HPHT sweet and sour continue and batch water or oil soluble UDC or TOL etc. the corrosion inhibitors for CCTS applications need to be specially formulated and evaluated under supercritical conditions of CO2.This study presents several testing procedures pursued in the lab under supercritical conditions of CO2 with or without impurities such as water SO2 and H2S. The corrosion rates to be calculated under different testing conditions were direct weight loss of metal coupons and the measurements of the corrosion current corrosion potential polarization resistance with electrochemical instruments. Based on these preliminary experiments the preferred experimental procedures have been suggested.Keywords: CCTS CCS supercritical condition CO2 corrosion inhibitors corrosion testing electrochemical RCA

Keywords: CCTS, CCS, supercritical condition, CO2, corrosion inhibitors, corrosion testing, electrochemical, RCA, EIS, AC Impedance

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