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A casing design method based on strain variations for wells in thermal recovery processes
HAN Lai-ju, JIA Jiang-hong, YAN Zhen-lai
(Drilling Technology Research Institute, Shengli Petroleum Engineering Corporation Limited, SINOPEC, Dongying 257017, China)
Abstract:
A new casing design method based on strain variations was proposed for wells subjected in intensive thermal recovery processes, such as steam recycling for heavy oil recovery, and the corresponding design criteria were introduced. The thermal stress and strain generated on the casing tube in the wellbore were analyzed and simulated during multi-round production processes using a 3D elastic-plastic finite element method(FEM) model. A case study for casing design using the new method was conducted for a typical well used for steam injection and oil production in Shengli Oilfield. The varying load on the casing tube and its damage mode can be considered based on the thermal stress and strain due to temperature variations during the steam injection, soaking and oil production processes. The results show that the plastic strain accumulated in the casing tube during multi-round steam recycling processes is important for the damage of the casing tube, and the proposed design method is useful to provide a new casing design criteria for wells used in thermal recovery.
Key words:  heavy oil reservoir  thermal recovery well  plastic strain  casing design  steam recycling