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Evaluation Of Titanium 475 Alloy For Use In Oil And Gas Environments

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ASTM Grade 29 titanium alloy (UNS R56404) has been traditionally used for oil and gas stress joints (TSJ). However, given the general difficulty of processing this type of alloy in the beta quenched condition and more recently the exorbitant increase in alloying costs due to the ruthenium, a new solution is required if titanium is to be considered for future applications. This 475 alloy was developed to meet geothermal requirements to replace Grade 29 seamless casing. The essential material properties of Grade 29 in bulk and welded condition as used for titanium stress joints were reported by Shutz et al.

Product Number: 51322-17840-SG
Author: William. D. MacDonald, Mikel Hogan, Dennis Dunlap
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings and Linings , Coatings
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A new titanium alloy, TIMETAL® 475 (Ti-475), which was developed for use in aggressive geothermal fields as a casing material, has been tested for use in typical oil and gas environments. The alloy composition, Ti-0.4Ni-3.75Mo-0.75Zr, provides excellent corrosion resistance in geothermal brines which are low pH and high in chlorides. For oil and gas applications, the additional effects of H2S and CO2 on the alloy must be considered. To this end, the alloy was subjected to the NACE TM-0177 Level VII exposure test. For the geothermal application, the alloy is prepared in the Solution Treated and Aged (STA) condition with a typical titanium bimodal microstructure. For use in oil and gas, the alloy is prepared in the Beta Annealed condition. The beta annealed condition is required for large components such as titanium stress joints where superior fatigue properties are required. This paper reviews the mechanical properties and corrosion evaluation of the Ti-475 alloy in the beta annealed condition as compared to the STA condition.

A new titanium alloy, TIMETAL® 475 (Ti-475), which was developed for use in aggressive geothermal fields as a casing material, has been tested for use in typical oil and gas environments. The alloy composition, Ti-0.4Ni-3.75Mo-0.75Zr, provides excellent corrosion resistance in geothermal brines which are low pH and high in chlorides. For oil and gas applications, the additional effects of H2S and CO2 on the alloy must be considered. To this end, the alloy was subjected to the NACE TM-0177 Level VII exposure test. For the geothermal application, the alloy is prepared in the Solution Treated and Aged (STA) condition with a typical titanium bimodal microstructure. For use in oil and gas, the alloy is prepared in the Beta Annealed condition. The beta annealed condition is required for large components such as titanium stress joints where superior fatigue properties are required. This paper reviews the mechanical properties and corrosion evaluation of the Ti-475 alloy in the beta annealed condition as compared to the STA condition.

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