51316-7847-Evaluation of Susceptibility to Hydrogen Embrittlement of High Strength Corrosion Resistant

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Product Number: 51316-7847-SG

ISBN: 7847 2016 CP

Author: Masayuki Sagara

Publication Date: 2016

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As exploration for extreme High- Pressure High-Temperature (x-HPHT) hydrocarbon reservoirs with corrosive environments has been increasing the demand for higher strength materials is increasing for x-HPHT corrosive deeper well applications. The presence of hydrogen sulfide in various environments raises the hydrogen embrittlement (HE) susceptibility of high strength grades even including corrosion resistant alloys (CRAs) when coupled with carbon steel by galvanically induced hydrogen stress cracking (GHSC). The control of precipitation inclusion and/or dislocation in materials should be taken into account to enhance the resistance to HE.The ultra-high strength CRA OCTG with 140ksi grade meant for x-HPHT gas well applications has been developed. The strength of the material is enhanced by alloying nitrogen and cold working. In this study the susceptibility to HE of the developed CRA is investigated. The GHSC susceptibility evaluation was conducted under sour environments by galvanically coupled with carbon steel. Another evaluation method using by SSRT under cathodic charging condition was employed to determine the HE susceptibilities among some alloys. It is revealed that the resistance to HE of the developed alloy is superior to other CRAs such as type 304L and some precipitation hardened alloys. From the results obtained it can be considered that the high stability of austenitic phase proper cold working ratio and no significant precipitation in this alloy achieve the excellent resistant to hydrogen embrittlement.