Study of the Failure Mechanism of an Integrated Injection-Production String in Thermal Recovery Wells for Heavy Oil

The integrated injection-production string is the core tool used in thermal recovery wells for heavy oil, mechanical behavior of which complex due to coupling effect downhole temperature and pressure load induced by steam huff puff operations. In this paper, an analysis model that calculates field during operations has been established based on basic principles energy conservation heat transfer. Then, force distribution strength check were analyzed. fatigue damage was evaluated considering dynamic loads injection process. corrosion life predicted. Finally, failure mechanism oil illustrated. results showed vibration are not main causes failure, but reason failure. residual corroded greatly reduced, fundamental string. This paper guiding significance optimization design safety evaluations oil.