|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Flexible Surface Treatment Technology to Enable Temporary SCC Prevention for Mg Dissolvable Alloys
||Lei Zhao, Wenhan Yue, Jiaxiang Ren, Tim Dunne, Peng Cheng, Huailiang Liu
|On-Site Speaker (Planned)
Massive quantities of Mg alloys are needed from oil and gas industry to manufacture “dissolving plugs”. Given its poor resistance to stress corrosion cracking (SCC), SCC is rarely reported from field operations despite their broad usage. Plugs are stressed for only short periods of time (<8 hrs), with most oil-well temperature <100℃, preventing SCC from fully developing. As a pioneer in developing HT wells (>140℃), we began to witness catastrophic failure caused by SCC. In this work, SCC resistance of dissolvable Mg alloy is found inversely related to its mechanical strength, which cannot be compromised, especially at HT. To address this dilemma, we successfully developed a flexible surface treatment technology that “temporarily” prevent SCC during operation, and a model is also proposed to explain its work mechanism. It is the first time of industry to report “temporary SCC prevention” of dissolvable plugs at extremely high temperature.
||Magnesium, Surface Modification and Coatings, Process Technology