Tight oil is a strategically important field for the replacement of oil and gas resources in Daqing Oilfield and even in China, and its economic and efficient development is significant in safeguarding China's energy security. Due to the tightness of tight oil reservoirs, large-scale horizontal well hydraulic fracturing is required to achieve effective exploitation, but this large-scale fracturing can lead to wellbore integrity issues such as casing deformation. The casing deformation in tight oil development is caused by shear slip of fractures. This paper applies the theory of generalized shear activity criterion to conduct an in-depth study on the mechanism of casing deformation in tight oil development. Combining practical experiences in tight oil development, a risk prediction method for casing damage in horizontal wells during tight oil development has been established. By controlling the fluid pressure on the fracture surface of the wellbore below the critical value for fracture reactivation, the shear slip generated by the fracture is reduced, thus preventing casing deformation. This approach also mitigates the occurrence of inter-well pressure communication and induced earthquakes. An evaluation method for wellbore integrity under large-scale fracturing conditions in tight oil wells is proposed, providing technological means for the development pattern of Daqing Oilfield in the new era. This research holds broad prospects for popularization and application.