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07112 Evaluation of Fitness for Purpose Test Environments for Sulfide Stress Cracking Tests of Casing Steels

Picture for 07112 Evaluation of Fitness for Purpose Test Environments for Sulfide Stress Cracking Tests of Casin
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Product Number: 51300-07112-SG
ISBN: 07112 2007 CP
Author: Peter R. Rhodes, Lillian Skogsberg, W.H. Grimes, Russell D.Kane, and Elizabeth A. Trillo
Publication Date: 2007
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In assessing risks of standard sulfide stress cracking (SSC) of low alloy steels under field conditions, the environmental effects in fitness-for-purpose (FFP) testing has focused on the H2S partial pressure, pH, and temperature. To gain information on additional variables, the literature has been reviewed and new test methods developed. Conclusions are presented on the effect of a number of variables, including (1) reduced H2S at high CH4 pressure, (2) flow, (3) solution composition, including the effect of CO2. The focus is the link between corrosion reactions and the resulting level of absorbed hydrogen. Reasons for the lack or correlation between NACE method A tensile tests and fracture mechanics tests with DCB specimens are presented. Laboratory environments are contrasted with the very different environmental conditions of a condensing water phase that occurs following a tubing/connection/packer failure.
In assessing risks of standard sulfide stress cracking (SSC) of low alloy steels under field conditions, the environmental effects in fitness-for-purpose (FFP) testing has focused on the H2S partial pressure, pH, and temperature. To gain information on additional variables, the literature has been reviewed and new test methods developed. Conclusions are presented on the effect of a number of variables, including (1) reduced H2S at high CH4 pressure, (2) flow, (3) solution composition, including the effect of CO2. The focus is the link between corrosion reactions and the resulting level of absorbed hydrogen. Reasons for the lack or correlation between NACE method A tensile tests and fracture mechanics tests with DCB specimens are presented. Laboratory environments are contrasted with the very different environmental conditions of a condensing water phase that occurs following a tubing/connection/packer failure.
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