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Fit for Purpose Qualification of Casings in HPHT Service—A Multi-Disciplinary Approach

Picture for Fit for Purpose Qualification of Casings in HPHT Service—A Multi-Disciplinary Approach
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Product Number: 51315-5994-SG
ISBN: 5994 2015 CP
Author: Sytze Huizinga
Publication Date: 2015
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High strength high collapse low alloy steel casing materials are required in many deep water HPHT wells. However the high strength limits the ability of the material to be qualified in the mildly sour environment. This paper describes a novel fit for purpose and multi disciplinary approach to evaluate and qualify these materials in these environments while considering the worst case discharge conditions. The methodology addresses the uncertainty in sour gas estimations comes up with evaluation criteria based on worst case discharge and well design principles and uses engineering critical assessment (fracture mechanics) and associated inspection acceptance criteria to qualify high strength high collapse low ally steel materials. The methodology relies on extensive inputs from well designers production chemists and geochemists metallurgists and inspection experts.Key words: HPHT casing low alloy steel fit for purpose stress corrosion testing engineering critical assessment H2S fugacity inspection acceptance criteria
High strength high collapse low alloy steel casing materials are required in many deep water HPHT wells. However the high strength limits the ability of the material to be qualified in the mildly sour environment. This paper describes a novel fit for purpose and multi disciplinary approach to evaluate and qualify these materials in these environments while considering the worst case discharge conditions. The methodology addresses the uncertainty in sour gas estimations comes up with evaluation criteria based on worst case discharge and well design principles and uses engineering critical assessment (fracture mechanics) and associated inspection acceptance criteria to qualify high strength high collapse low ally steel materials. The methodology relies on extensive inputs from well designers production chemists and geochemists metallurgists and inspection experts.Key words: HPHT casing low alloy steel fit for purpose stress corrosion testing engineering critical assessment H2S fugacity inspection acceptance criteria
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