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Nickel-base alloys 718, 725, and 925 are commonly used in oil and natural gas production. Being heavily alloyed multi-component systems; these materials require special consideration for processing and heat treatments. This paper shows the effect of intergranular precipitates on mechanical properties and slow strain rate (SSR) test results in sour oil patch environments.
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In a 1998 study, costs for corrosion in USA were estimated to be about 276 billion US-$. One way to reduce this gigantic amount of money is to use modern stainless steels and nickel alloys with excellent resistance to various forms of corrosion in corrosive environments like seawater, brines, oil and sour gas wells.
An intensive testing program to study the effect of the heat treatment of the alloy USN N07718 was launched. Corrosion and environmental cracking were also tested.
Simultaneous in-situ micro-visualization and electrochemical testing was done on small electrodes from UNS N07718 immersed in artificial seawater at room temperature.
Electrochemical testing and in-situ microscopy using a mini-autoclave has been used to determine the precursor sites for pitting corrosion of UNS N07718 at high temperatures in chloride containing environments.
The influence of loading mode and specimen geometry on the measured hydrogen embrittlement susceptibility of UNS N07718 (alloy 718) has been assessed.
Additive manufacturing can manufacture components that were previously impossible - without compromising strength, ductility and corrosion resistance. The pitting corrosion resistance of a selective laser melted Nickel alloy has been evaluated by electrochemical methods.
Additively Manufactured Alloy UNS N07718 (AM 718) has been increasingly adopted for components in oilfield applications. AM 718 fabricated using laser powder bed fusion (LPBF) has demonstrated not only excellent mechanical performance, but also promising capabilities in critical services such as sour or hydrogen-generating conditions. In oilfield applications, it is generally felt that AM 718 should comply with API standard 20S4, and align with the requirements for wrought 718 in API 6ACRA.
Oil and gas production from highly saline reservoirs can present challenges to the completion materials. The most saline fields often require downhole injection of (low chloride) wash water to dilute the produced water and mitigate the threat of halite precipitation on the production tubulars. The present paper investigates the threats associated with the co-mingled wash water and production fluids with respect to common completion materials.