07106 Environmental Cracking Performance of Corrosion Resistant Alloys for the Tyrihans Field Expandable Liner

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Product Number: 51300-07106-SG

ISBN: 07106 2007 CP

Author: R. Morana, M. Tabinor, B. M. Bailey, P. I. Nice, K. Bersas, A. Bufalini, L. Scoppio, and G. Mortali

Publication Date: 2007

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The high temperature Tyrihans field required an expandable liner for dual lateral production wells. The tubing material selected for Tyrihans production wells is alloy UNS S41426 (grade 110ksi). Since the expandable liner is directly exposed to reservoir fluids, the material needs to meet the same corrosion and environmental cracking performance as the tubing. The initial program attempted to qualify alloy UNS S41426 (grade 80ksi). Mechanical property analysis and expansion trials (ID ratio of 19.8%) concluded this alloy to be unsuitable for the required expansion ratio. Alternative alloys, UNS S31603 and UNS N08904 were selected for evaluation via expansion trials and environmental cracking tests in simulated Tyrihans well completion brine and reservoir fluid. 4 Point Bent Beam (4PBB, longitudinal) and C-Ring (transverse) tests on post-expanded alloys were conducted in high chloride-containing environments, with and without CO2/H2S. The results proved the suitability of the alloys through expansion trials, but UNS S31603 revealed susceptibility to corrosion attack if oxygen is introduced into the system.