Residual mechanical strength evaluation of corroded tubing in cryogenic carbon dioxide injection wellbore

Carbon dioxide injection or storage in mature or partially depleted oil reservoirs is an effective way to reduce carbon dioxide emissions and improve oil recovery. However, the corrosion defects greatly reduce the residual mechanical strength of the tubing with the effect of frost heaving force, which seriously limits the carbon dioxide enhanced oil recovery technology widely application. Therefore, the residual mechanical strength of corroded tubing in cryogenic carbon dioxide injection well is investigated in this paper. The results indicate that: (a) The residual mechanical strength of corroded tubing with the effect of frost heaving force is about 68% less than that without frost heaving force. (b) The effect of corrosion depth and location are sensitive, while the corrosion shape is relatively weak. (c) It is a meaningful method to increase working pressure to improve the residual mechanical strength of corroded tubing in the frozen section.