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51314-3983-Evaluation of Cracking and Corrosion Susceptibility in High pH Scale Dissolver CO2-Containing Environment

Picture for Evaluation of Cracking and Corrosion Susceptibility in High pH Scale Dissolver CO2-Containing Enviro
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Product Number: 51314-3983-SG
ISBN: 3983 2014 CP
Author: Sudhakar Mahajanam
Publication Date: 2014
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Evaluation of Cracking and Corrosion Susceptibility in High pH Scale Dissolver CO2-Containing EnvironmentSudhakar Mahajanam Raymundo P. CaseConocoPhillips USAFrode BredalConocoPhillips NorwayABSTRACTA high pH scale dissolver to be used for cleaning gas lift valves (GLV) was evaluated to address corrosion and cracking concerns in offshore operations. Corrosion and stress corrosion cracking (SCC) tests at 120°C (250°F) using 13 Cr (tubing) and Q-125 (casing) steels were done to characterize and qualify use of this scale dissolver. It was found that the presence of this chemical did not promote SCC of 410 stainless steel (SS) or Q-125 steel in slow strain rate tests (SSRT) or electrochemical tests. However weight loss testing for 7 days in CO2 saturated solutions and Electrochemical Impedance Spectroscopy (EIS) measurements with the chemical added indicated very high general corrosion rates for both carbon steel (1450 mpy) and SS (225 mpy). It was recommended that this scale dissolver not be used for this application. 
Evaluation of Cracking and Corrosion Susceptibility in High pH Scale Dissolver CO2-Containing EnvironmentSudhakar Mahajanam Raymundo P. CaseConocoPhillips USAFrode BredalConocoPhillips NorwayABSTRACTA high pH scale dissolver to be used for cleaning gas lift valves (GLV) was evaluated to address corrosion and cracking concerns in offshore operations. Corrosion and stress corrosion cracking (SCC) tests at 120°C (250°F) using 13 Cr (tubing) and Q-125 (casing) steels were done to characterize and qualify use of this scale dissolver. It was found that the presence of this chemical did not promote SCC of 410 stainless steel (SS) or Q-125 steel in slow strain rate tests (SSRT) or electrochemical tests. However weight loss testing for 7 days in CO2 saturated solutions and Electrochemical Impedance Spectroscopy (EIS) measurements with the chemical added indicated very high general corrosion rates for both carbon steel (1450 mpy) and SS (225 mpy). It was recommended that this scale dissolver not be used for this application. 
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51314-3981-Stress Corrosion Cracking Resistance of Candidate A-USC Alloys

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