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07097 New Insights into the Potential for Environmental Cracking of Corrosion Resistant Alloys in High-Density Formate and Bromide Well Completion Brines at High Temperature

Picture for 07097 New Insights into the Potential for Environmental Cracking of Corrosion Resistant Alloys in Hi
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Product Number: 51300-07097-SG
ISBN: 07097 2007 CP
Author: John D. Downs, Siv Howard, Mike Harris, William Benton, M. Billingham
Publication Date: 2007
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The objective of the laboratory experiments described in this paper was to examine how exposure to a combination of H2S and CO2 would impact on environmental cracking, hydrogen charging and loss of ductility of CRAs and Alloy 718 immersed in calcium bromide brines and high density buffered potassium/cesium formate brines at 40°C (104°F) and 160°C (320°F). The test results indicate that modified 13Cr-2Mo is susceptible to environmental cracking at 160°C (320°F) in high-density brines contaminated with a mixture of CO2 and H2S. In calcium bromide brine the cracking occurred both at high (160°C / 320°F) and low (40°C / 104°F) temperatures. In the buffered formate brine, cracks were observed on cross-sections at high temperature only.
The objective of the laboratory experiments described in this paper was to examine how exposure to a combination of H2S and CO2 would impact on environmental cracking, hydrogen charging and loss of ductility of CRAs and Alloy 718 immersed in calcium bromide brines and high density buffered potassium/cesium formate brines at 40°C (104°F) and 160°C (320°F). The test results indicate that modified 13Cr-2Mo is susceptible to environmental cracking at 160°C (320°F) in high-density brines contaminated with a mixture of CO2 and H2S. In calcium bromide brine the cracking occurred both at high (160°C / 320°F) and low (40°C / 104°F) temperatures. In the buffered formate brine, cracks were observed on cross-sections at high temperature only.
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