Cement Loop Damage-based Fracture Mechanism during Repair of Casing Failure Well

Casing failure is a common problem in oilfield. This paper studies on cement loop damage during the repair of casing failure well based on the theories of composite materials mechanics, interface mechanics and damage mechanics, and a composite model was established. Through the model, the distributions of stress and displacement fields were obtained. Moreover, the influences of friction coefficient on interface were also studied. And the cement loop failure length is also determined. Finally, the case shows that the model is suitable for repairing casing failure better.