Abstract: The late-stage development of super-heavy oil cyclic steam stimulation is typically confronted with adverse conditions including low formation pressure, a high proportion of low-efficiency wells and severe steam channeling. Although non-hydrocarbon gas-assisted cyclic steam stimulation can significantly enhance oil production, it still entails multiple safety and environmental risks, such as low-temperature freeze plugging, high-pressure jet leakage, mild acid corrosion and potential well control hazards. To mitigate the above risks, a whole-life-cycle safety protection system was established in this study. In terms of safety management, the field management regulations were improved, a full-staff responsibility list was implemented, and classified and customized professional training was systematically carried out. In the technical demonstration and design stage, a four-level verification mechanism was formulated to optimize well selection considering treatment cycles, reservoir conditions and production parameters, while multi-model simulation methods were adopted to optimize injection parameters. For on-site process control, a multi-party collaborative management mechanism was constructed. A standardized supervision mode featuring information collection, dual inspection, dual monitoring and triple verification was implemented, with standardized operation procedures and digital supervision technologies fully applied. The proposed system effectively eliminates core operational risks and realizes coordinated improvement in safety and production efficiency, providing technical support for the large-scale and safe application of the technology.

Key words: non-hydrocarbon gas-assisted cyclic steam stimulation, safety risk prevention and control, full-lifecycle management, well selection optimization